EP1112587A1 - Vorrichtung und verfahren zum ätzen eines substrates mittels eines induktiv gekoppelten plasmas - Google Patents
Vorrichtung und verfahren zum ätzen eines substrates mittels eines induktiv gekoppelten plasmasInfo
- Publication number
- EP1112587A1 EP1112587A1 EP00949074A EP00949074A EP1112587A1 EP 1112587 A1 EP1112587 A1 EP 1112587A1 EP 00949074 A EP00949074 A EP 00949074A EP 00949074 A EP00949074 A EP 00949074A EP 1112587 A1 EP1112587 A1 EP 1112587A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frequency
- power
- substrate
- plasma
- coupled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
- H01J37/321—Radio frequency generated discharge the radio frequency energy being inductively coupled to the plasma
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/3266—Magnetic control means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
Definitions
- the invention relates to a device and a method which can be carried out therewith for etching a substrate, in particular a silicon body, by means of an inductively coupled plasma according to the category of the independent claims.
- the application DE 199 00 179 already describes an inductive plasma source which has been further developed compared to DE 42 41 045 C2 and which is suitable for particularly high plasma powers by means of a loss-free symmetrical high-frequency supply of the coil of the inductive plasma source, and which generates an inductive plasma which is particularly useful is poor in interference.
- this type of source there is a practicable power limit of about 3 k att to 5 k att, above which the required high-frequency components become extremely expensive or problems regarding the plasma stability become excessive.
- Such an adiabatic power transition i.e. A gradual start-up or reduction of the coupled plasma power, with simultaneous continuous adaptation of the impedance of the ICP source to the respective plasma impedance dependent on the coupled plasma power by means of an automatic matching network or an impedance transformer (“matchbox”) makes it possible to explain the problems relating to power reflection and voltage increase when switching on and off plasma powers in the range from 1 kWatt to 5 kWatt.
- a typical duration of the switch-on processes is in the range from 0.1 sec to 2 sec. Faster power changes are not possible with this approach.
- the device according to the invention and the method carried out therewith has the advantage over the prior art that it is a variably adjustable, pulsed
- High-frequency power is generated, which can be coupled as plasma power into the inductively coupled plasma, the pulsing of the plasma power taking place very quickly, for example within microseconds, and at the same time being associated with power changes of several thousand watts.
- the pulsation of the plasma power continues with a significant improvement in the economy of the ICP source connected and opens the possibility to reduce the mean plasma power without reducing the etching rate or to increase the etching rate with unchanged mean plasma power. Furthermore, pulsing the plasma power can effectively reduce electrical interference effects from the source area of the ICP source.
- the plasma plasma system according to the invention is provided with a balanced, symmetrically constructed and symmetrically powered configuration of the ICP source. In this way, the homogeneity of the etching rates over the surface of the substrate is significantly improved and the electrical coupling of high plasma powers into the generated plasma is considerably simplified.
- This magnetic field significantly improves the use of the coupled high-frequency power to generate the desired plasma species (electrons, ions, free radicals), ie the efficiency of the plasma generation , Therefore, at same plasma power, significantly higher etching rates are possible.
- a particularly good guidance of the generated plasma through the magnetic field and a particularly low penetration of the generated magnetic field onto the substrate itself to be etched further advantageously results if an aperture is also provided, which is arranged concentrically to the inner wall of the reactor, preferably about 5 cm is arranged above the substrate arranged on a substrate electrode.
- This aperture leads to an improved uniformity of the etching over the substrate surface and at the same time avoids in the case of a time-varying magnetic field high induced voltages in the substrate to be etched, which may damage electronic components there.
- Plasma power can vary the frequency of the generated alternating electromagnetic field, since it enables a particularly fast switchover between plasma power pulses and pulse pauses.
- This frequency variation advantageously prevents high reflected powers occurring back into the ICP coil generator when the plasma power is pulsed, in particular in times of a rapidly changing coupled plasma power, ie in the case of pulse-to-pause transitions.
- Another major advantage of an impedance matching that is as good as possible at all times via a variable frequency of the high-frequency power of the ICP coil generator is that this frequency change is very great can be carried out quickly since it is only limited by the control speed of an electronic circuit which carries out the frequency variation.
- Response times or very rapid changes in the output power of the ICP coil generator in the microsecond range are thus possible in a stable manner, which makes it possible to work with plasma power pulses during the etching and / or passivation steps, the duration of which is in the microsecond range.
- the device according to the invention also ensures the impedance matching of inductively coupled plasma or ICP source and ICP coil generator at all times in this case.
- Plasma power pulses achieve a much higher plasma density than with continuous operation. This is due to the fact that the generation of an inductive plasma is a highly non-linear process, so that the average plasma density in this pulsed operating mode is higher than with an average plasma power corresponding to the time average. Therefore, based on the time average, more reactive species and ions are effectively obtained in pulse mode than in continuous wave mode. This is especially true when so-called "giant pulses" are used, ie relatively short and extremely powerful high-frequency power pulses of, for example, 20 kWatt peak power, as is now possible with the device according to the invention, the mean plasma power then being, for example, only 500 watts.
- Another advantage of pulsed operation of the ICP source is that, in the pauses between the high-frequency power pulses, disruptive electrical charges can be discharged on the substrate to be etched, and thus the overall profile control during etching is improved.
- the pulsing of the generated magnetic field is temporally correlated or synchronized with the pulsing of the injected plasma power and / or the pulsing of the high-frequency power injected into the substrate via the substrate voltage generator.
- the temporal synchronization of the pulsation of the magnetic field and the coupled plasma power results in a significant reduction in the ohms occurring in the magnetic field coil, see heat losses, which alleviates problems of cooling and temperature control of the magnetic field coil.
- the current through the magnetic field coil can also be pulsed, for example with a pulse-to-pause ratio of 1:18, which advantageously means that the required Heat dissipation from the magnetic field coil reduced to 1/18 of the original value. At the same time, the consumption of electrical energy drops accordingly.
- FIG. 1 shows a schematic plasma setting system
- FIG. 2 shows an electronic one
- Figure 3 shows an example of a filter characteristic
- Figure 4 shows an example of a time synchronization of high-frequency plasma power pulses coupled into the plasma with magnetic field pulses
- Figure 5 shows one in the
- FIG. 6 an equivalent circuit diagram for the generation of the substrate electrode voltage and FIG. 7, the change in the substrate electrode voltage during a high-frequency power pulse as a function of the number of oscillation periods.
- a plasma set 5 initially has a reactor 15, in the upper region of which in an inductively coupled plasma 14 is generated in a manner known per se via an ICP source 13 (“Inductively Coupled Plasma”). Furthermore, there is a gas supply 19 for supplying a reactive gas such as SF 6 , C1F 3 , 0 2 , CF 8 , C 3 F 6 , SiF 4 or NF 3 , a gas discharge 20 for the removal of a reactive gas such as SF 6 , C1F 3 , 0 2 , CF 8 , C 3 F 6 , SiF 4 or NF 3 , a gas discharge 20 for the removal of
- a substrate 10 for example a silicon body or silicon wafer to be structured with the etching method according to the invention
- a substrate electrode 11 in contact with the substrate 10
- a substrate voltage generator 12 couples a high-frequency alternating voltage or high-frequency power into the substrate electrode 11 and above that into the substrate 10, which accelerates the inductively coupled
- Plasma 14 generated ions on the substrate 10 causes.
- the high-frequency power or alternating voltage coupled into the substrate electrode 11 is typically between 3 watts and 50 watts or 5 volts and 100 volts in continuous wave mode or in pulsed mode in the time average over the pulse sequence.
- an ICP coil generator 17 is provided, which is connected to a second impedance transformer 18 and above that to the ICP source 13.
- the ICP source 13 generates a high-frequency alternating electromagnetic field and above it in the reactor 15 an inductively coupled plasma 14 composed of reactive particles and electrically charged particles (ions), which are created by the action of the high-frequency alternating electromagnetic field on the reactive gas.
- the ICP source 13 has a coil with at least one turn.
- the second impedance transformer 18 is preferably designed in the manner proposed in the application DE 199 00 179.0, so that a balanced, symmetrical configuration and supply of the ICP source 13 via the ICP coil generator 17 is provided.
- the center tap 26 of the coil of the ICP source 13, as indicated in FIG. 2, is preferably grounded.
- the plasma etching system 5 also carries out, for example, the anisotropic high rate etching process known from DE 42 41 045 C2 for silicon with alternating etching and passivation steps.
- the anisotropic high rate etching process known from DE 42 41 045 C2 for silicon with alternating etching and passivation steps.
- the plasma deposition system 5 which is known from the prior art as far as described so far, and of the etching process carried out therewith, in particular with regard to the reactive gases, the process pressures and the substrate electrode voltages in the respective etching steps or passivation steps therefore, reference is made to DE 42 41 045 C2.
- the plasma set 5 according to the invention is also suitable for process control as described in the application DE 199 27 806.7.
- the passivation steps in the reactor 15 are passivated with a process pressure of 5 ⁇ bar to 20 ⁇ bar and with an average plasma power of 300 to 1000 watts coupled into the plasma 14 via the ICP source 13.
- C 4 F 8 or C 3 F 6 is suitable as the passivating gas.
- a process pressure of 30 ⁇ bar to is then during the subsequent etching steps 50 ⁇ bar and a high mean plasma power of 1000 to 5000 watts.
- SF 6 or C1F 3 is suitable as the reactive gas.
- mean plasma power is always understood to mean a coupled-in plasma power averaged over a large number of plasma power pulses.
- a so-called “spacer” is placed as a spacer 22 made of a non-ferromagnetic material such as aluminum.
- This spacer 22 is inserted concentrically into the wall of the reactor 15 as a spacer ring and thus forms the reactor wall in some areas a typical height of approx. 5 cm to 30 cm with a typical diameter of the reactor 15 of 30 cm to 100 cm.
- the spacer 22 is further surrounded by a magnetic field coil 21, which has, for example, 100 to 1000 turns and is wound from a copper wire that is sufficiently thick for the amperage to be used.
- a magnetic field coil 21 which has, for example, 100 to 1000 turns and is wound from a copper wire that is sufficiently thick for the amperage to be used.
- copper pipes can be included in the magnetic field coil 21 through which cooling water flows in order to dissipate heat losses from the magnetic field coil 21.
- the magnetic field coil 21 itself out of a thin copper tube which is coated with an electrically insulating material and through which cooling water flows directly.
- An electric current of, for example, 10 to 100 amperes is passed through the magnetic field coil 21 via a power supply unit 23.
- this is, for example, a direct current which generates a static magnetic field inside the reactor 15, which in the case of a magnetic field coil 21 with 100 turns and a length of 10 cm and a diameter of 40 cm, for example, a magnetic field strength in the center of the magnetic field coil 21 of about 0.3 m Tesla / A current flow generated.
- magnetic field strengths of 10 mT to 100 mT, for example 30 mT are required. This means that the power supply unit 23 provides current strengths of approximately 30 to 100 amperes at least during the etching steps for etching a substrate 10.
- a permanent magnet can also be used.
- a permanent magnet advantageously does not require any energy, but has the disadvantage that it is not possible to set the magnetic field strength, which is advantageous for setting an optimal etching process.
- the field strength of a permanent magnet is temperature-dependent, so that the magnetic field coil 21 is preferred.
- the direction of the magnetic field generated via the magnetic field coil 21 or the permanent magnet is at least approximately or predominantly parallel to that through the connecting line of substrate 10 and inductively coupled plasma 14 or the
- Plasma excitation zone is defined direction (longitudinal magnetic field orientation).
- a further advantageous embodiment of the exemplary embodiment explained provides that, in order to improve the uniformity of the etching process, an aperture known from DE 197 34 278 inside the reactor 15 concentric with the reactor wall between the ICP source 13 or the plasma excitation zone and the substrate 10 is attached.
- This aperture is in Figure 1 for the sake of
- spacer 22 is preferably attached to the spacer 22 (“spacer”) about 5 cm above the substrate electrode 11 or the substrate 10.
- a suitable, known monitoring device must be integrated into the power supply unit 23, which is integrated into the process sequence control and monitors the coil temperature and performs an emergency shutdown, for example in the event of cooling water failure.
- the ICP coil generator 17 continues to couple a pulsed plasma power into the inductively coupled plasma 14 during the etching steps and / or during the passivation steps, which average time is between a minimum of 300 watts and a maximum of 5000 watts. Preferably, 2000 watts are coupled in during the etching steps on average and 500 watts during the passivation steps.
- the impedance of the high-frequency power generated by the ICP coil generator 17 is continuously adapted to the plasma impedance that changes with changing, ie pulsed plasma power.
- the frequency of the high-frequency alternating electromagnetic field, which the ICP coil generator 17 generates is varied within a predetermined bandwidth for impedance matching.
- the matching network which is preferably constructed symmetrically and feeds the ICP source 13 symmetrically, is initially set in the second impedance transformer 18 in such a way that the best possible impedance matching is always given when the coupled-in high-frequency plasma power pulses have reached their maximum values.
- Typical maximum values of the high-frequency plasma power pulses are between
- the frequency variation of the coupled electromagnetic alternating field takes place such that when the maximum values of the high-frequency plasma power pulses are reached, the stationary or resonant frequency 1 ⁇ ⁇ of the high-frequency alternating electromagnetic field generated by the ICP coil generator 17 is reached.
- the stationary frequency 1 , ⁇ is preferably 13.56 MHz.
- the variation of the frequency of the electromagnetic alternating field around the stationary frequency 1 xx when pulsing the plasma power is carried out to ensure that when pulsing the plasma power always an at least extensive adaptation of the impedance of the generated high-frequency power or the ICP coil generator 17 to the respective, itself temporal as a function of plasma performance changing impedance of the plasma 14 is given.
- the frequency of the ICP coil generator 17 is released within a certain bandwidth around the stationary frequency 1 ⁇ ⁇ and varied within this bandwidth by control electronics for impedance matching.
- a filter characteristic curve 1 ⁇ which specifies a preset frequency range (bandwidth) within which the frequency of the ICP coil generator 17 is varied, each frequency having a certain high-frequency power or plasma power to be coupled in or a damping A is assigned to the power of the ICP coil generator 17.
- the frequency to be achieved in the stationary case is
- Stationary frequency l , ⁇ which is at least approximately present when the respective maximum power of the pulse is reached during a plasma power pulse.
- the ICP source 13 ie specifically its coil
- the matching network 2 is part of the second impedance transformer 18.
- the ICP coil generator 17 also has a high-frequency power amplifier 3 and a quartz oscillator 4 for generating a high-frequency fundamental with a fixed frequency of, for example, 13.56 MHz.
- the high-frequency fundamental oscillation of the quartz oscillator 4 is normally fed into the amplifier input of the power amplifier 3 in the prior art. However, this feed is first modified in such a way that the quartz oscillator 4 from the amplifier input of the power amplifier 3 at least during the
- quartz oscillator 4 in the stationary case, i.e. after completion of a power variation, switch back to the amplifier input and disconnect the external feedback loop.
- the power amplifier 3 also has generator control inputs 9, which are used for external control of the ICP coil generator 17, in a known manner. It is also possible, for example, to switch the ICP coil generator 17 on and off or to specify a high-frequency power to be generated for coupling into the plasma 14.
- generator status outputs 9 ⁇ are provided for feedback of generator data, such as generator status, current output power, reflected power, overload, etc., to an external control device (machine control) (not shown) or the power supply unit 23 of the plasma generator 5.
- the amplifier input of the power amplifier 3 is now connected in the sense of a feedback circuit at least temporarily, ie during power change phases, to the ICP source 13 via a frequency-selective component 1.
- capacitors, inductors and resistors or combinations thereof can be connected and provided in a manner known per se as a voltage divider, in order to convert the high voltages that occur at the coil of the ICP source 13 to an input variable for the frequency-selective component 1 or to weaken the amplifier input of the power amplifier 3 suitable dimension.
- voltage dividers are state of the art and are only indicated in FIG. 2 by a coupling-out capacitor 24 between the coil of the ICP source 13, ie a signal tap 25 and the frequency-selective component 1.
- the signal tap 25 can alternatively also be moved into the vicinity of the grounded center or center tap 26 of the coil of the ICP source 13, where correspondingly lower voltage levels prevail.
- the distance of the signal tap 25 which can be designed, for example, as an adjustable clamping contact, from the grounded center tap 26 of the coil of the ICP source 13, a greater or lesser tapped voltage can be set and favorable level relationships can thus be achieved.
- the frequency-selective component 1 is shown as an example as a tunable arrangement of coils and capacitors, so-called LC resonance circuits, which together form a bandpass filter.
- This bandpass filter has a certain predetermined bandwidth as a passband of, for example, 0.1 MHz to 4 MHz and a filter characteristic curve ⁇ , as is shown schematically in FIG.
- the bandpass filter has a resonance or stationary frequency 1 , ⁇ with maximum signal transmission.
- This stationary frequency 1 ⁇ ⁇ amounts to 13.56 MHz in the example explained and can in particular be an additional one with a quartz crystal 6 or a piezoceramic filter element
- Component of the bandpass filter can be precisely defined.
- the arrangement described above of regulated power amplifier 3, matching network 2, ICP source 13 and band filter represents a feedback circuit in the manner of a Meissner 'see oscillator. This oscillates during operation first in the vicinity of the stationary frequency 1 ⁇ ⁇ in order to focus on one to rock out the predetermined output power of the power amplifier 3.
- the phase relationship between the generator output and the signal tap 25 required for the oscillation is previously set once, for example via a delay line 7 of defined length and thus via a phase shift defined by the signal transit time or a phase shifter known per se instead of the delay line 7. This always ensures that the coil of the ICP source 13 is optimally evaporated with a correct phase.
- the resonance condition of the feedback circuit via the frequency-selective component 1 is otherwise not sharp, so that in many cases a slight frequency shift in the vicinity of the resonance or stationary frequency l , ⁇ is sufficient to quasi automatically correct the resonance condition with regard to the phase. It is therefore sufficient to only approximately correct the resonance condition by the external wiring so that the resonance circuit swings up somewhere in the immediate range of its stationary frequency l ⁇ .
- the explained feedback loop can be located within the pass band of the bandpass filter
- the frequency of the ICP coil generator 17 will return to near or to the value of the maximum pass frequency, which is given by the stationary frequency 1 , ⁇ .
- This adaptation of the impedance by frequency variation takes place automatically and very quickly within a few oscillation periods of the high-frequency alternating voltage generated by the ICP coil generator, ie in the microsecond range.
- connection between the output of the power amplifier 3 and the input of the second impedance transformer 18 is otherwise provided by the line 8, which is designed as a coaxial cable and is capable of carrying a power of a few kWatt.
- the output power of the ICP coil generator 17 is switched on and off, for example, periodically with a repetition frequency of typically 10 Hz to 1 MHz, preferably 10 kHz to 100 kHz. pulsed.
- the amplitude of the Hull curve of the output voltage of the ICP coil generator 17 can be modulated with a suitable modulation voltage.
- Such devices for amplitude modulation are well known from high frequency technology.
- the generator control input 9 is used, for example, to set the target value for the high-frequency power of the ICP Coil generator 17 is used to feed the signal that modulates the high-frequency power of the ICP coil generator 17.
- the ICP coil generator 17 and the other affected components of the plasma generator 5 when pulsing the plasma power must be designed so that they can handle the peak loads (current and voltage peaks) without damage. Due to the high voltage peaks at the inductive coil, the balanced supply of the ICP source 13 has a particularly advantageous effect on the maintenance of favorable plasma properties.
- Typical pulse-to-pause ratios i.e. the ratio of the time duration of the pulses to the time duration of the pulse pauses in the plasma etching process with pulsed plasma power explained is otherwise between 1: 1 and 1: 100.
- the amplitude of the individual high-frequency power pulses for generating the plasma power pulses is expediently between 500 watts and 20,000 watts, preferably approximately 10,000 watts, the mean plasma power being set, for example, by adjusting the pulse-to-pause ratio.
- a further exemplary embodiment provides in a continuation of the exemplary embodiment explained above that the magnetic field generated via the magnetic field coil 21 is now also pulsed.
- a constant or pulsed magnetic field is advantageous for the method according to the invention for plasma etching with plasma power pulses, but is not essential.
- an additional magnetic field can also be dispensed with.
- the pulsation of the magnetic field which is produced in a simple manner via corresponding current pulses generated by the power supply unit 23, is particularly preferably carried out in such a way that the magnetic field is only generated when a high-frequency power pulse for generating or coupling plasma power into the inductively coupled plasma is also generated at the same time 14 is pending at the ICP source 13. As long as no plasma power is coupled in or no plasma is excited, no magnetic field support is usually required.
- Such a temporal synchronization of high-frequency power pulses for coupling plasma power into the plasma 14 and current pulses through the magnetic field coil 21 is explained with the aid of FIG. 4.
- the coil current through the magnetic field coil 21 is switched on shortly before a high-frequency power pulse and switched off again shortly after the end of this pulse.
- the temporal synchronization of the current or plasma power pulses can be ensured in a simple manner by means of a pulse generator known per se, for example integrated into the power supply unit 23, which is provided with additional timing elements in order to provide the plasma power pulse with a certain delay of, for example, 10% of the set one
- a connection between the power supply unit 23 and the ICP coil generator 17 is also provided.
- Such synchronization circuits and corresponding timers for Production of the time delays required are state of the art and generally known.
- the power supply unit 23 is further connected to the ICP coil generator 17. It should also be emphasized that the duration of a current pulse through the magnetic field coil 21 is advantageously always somewhat longer than the duration of a plasma power pulse.
- Typical repetition rates or pulse rates are based on the inductance of the magnetic field coil 21, which
- Rate of change of the coil current is limited. A repetition rate of a few 10 Hz to 10 kHz, depending on their geometry, is realistic for most magnetic field coils 21. Typical pulse-to-pause ratios for the plasma power pulses are between 1: 1 and 1: 100.
- the aperture known from DE 197 34 278.7 and already explained above below the magnetic field coil 21 a few cm above the substrate 10 or the substrate electrode 11 which carries the substrate 10.
- This aperture on the one hand significantly improves the uniformity of the etching across the substrate surface, in particular with a symmetrically fed ICP source 13. At the same time, it also reduces the time-variable magnetic field - the transients - at the location of the substrate 10.
- Eddy currents in the aperture ring of the aperture lead to an evaporation of the time-variable magnetic field components immediately in front of the substrate 10, so that induction processes on the substrate 10 itself are weakened.
- Such changing magnetic fields could induce voltages on antenna structures on the substrate 10, which in turn can lead to damage to the substrate 10 if it does so for example, has integrated circuits or in particular field effect transistors.
- a further exemplary embodiment provides, in a continuation of the above exemplary embodiments, that in addition to the pulsing of the plasma power via the ICP coil generator, if appropriate as explained above with simultaneous use of a temporally constant or pulsed magnetic field, now also the one applied to the substrate 10 via the substrate electrode 11. of the
- High voltage power generated by the substrate voltage generator 12 is pulsed, and that these pulsations of plasma power and substrate voltage or of plasma power, substrate voltage and magnetic field are in particular synchronized with one another.
- the pulsing of the pulsed high-frequency power coupled into the substrate electrode 11 preferably takes place in such a way that high-frequency power is coupled into the substrate 10 via the substrate voltage generator 12 only during the duration of the plasma power pulses generated via the ICP coil generator 17.
- Plasma power pulse i.e. at maximum plasma density of positively charged ions and electrons.
- the pulsing of the high-frequency power coupled into the substrate electrode 11 can, however, also take place in such a way that one or more
- Substrate voltage generator pulses are only applied during the pulse pauses of the plasma power pulses.
- the one coupled in via the substrate voltage generator High-frequency power is coupled in when the plasma generation is not active, i.e. with a minimum density of positively charged ions and electrons, but a maximum density of negatively charged ions, so-called anions, which result from the recombination of electrons and
- substrate electrode power is activated in the form of one or more pulses, this leads to desirable wafer effects on the substrate 10 to be processed in certain applications, such as, for example, in the case of an etch stop on a buried dielectric such as SiO 2 with a simultaneously high aspect ratio of the trench trench produced, which in particular caused by the increased exposure to negatively charged ions, which otherwise
- Plasma etching processes play practically no role.
- special implementation of this temporal correlation of plasma power pulses and high-frequency power pulses coupled into the substrate electrode 11 is provided in that the plasma generation takes place essentially in a continuous wave and is only switched off briefly in each case in order to within this short switch-off pause of the ICP coil generator 17 to couple a high-frequency power pulse into the substrate 10 via the substrate voltage generator 12.
- the ICP coil generator 17 is thus periodically briefly interrupted with the repetition frequency of the appearance of the substrate voltage generator pulses for a period of time that is longer, in particular slightly longer than the pulse duration of the
- Substrate voltage generator pulse is.
- the pulse-to-pause ratio of the ICP coil generator 17 is typically 1: 1 to 20: 1.
- the substrate voltage generator pulses can thus be coupled in both during the plasma power pulses and during the plasma power pauses, i.e. for example, one substrate voltage generator pulse is generated during a plasma power pulse and another during a plasma power pause
- Substrate voltage generator pulse set The ratios of the pulse numbers of the substrate voltage generator 12 in the phases “plasma on” and “plasma off” can be chosen largely freely in individual cases.
- the substrate voltage generator pulses only during falling and / or rising pulse edges of the plasma power pulses, ie when the "afterglow phase” begins or when the plasma generation starts up.
- the optimum correlation of plasma power pulses and substrate voltage generator pulses in each case must be determined by the person skilled in the art in individual cases for the respective etching process or the respectively etched substrate on the basis of simple test statutes.
- the temporal synchronization or correlation of the high-frequency power pulses coupled into the substrate 10 via the substrate voltage generator 17 with the plasma power pulses is very particularly preferably such that the pulse duration of the
- High-frequency power pulses are set so short that a single pulse only lasts a few oscillation periods, in particular less than 10 oscillation periods, of the high-frequency fundamental oscillation of the high-frequency alternating voltage generated in the substrate voltage generator.
- a frequency of 13.56 MHz is used for the basic oscillation of the high-frequency power pulses to be coupled into the substrate, so that the duration of one oscillation period of the high-frequency basic oscillation is approximately 74 ns. In the case of 10 oscillation periods, this results in a pulse duration of the substrate voltage generator pulses of only 740 ns.
- a repetition frequency of the individual pulses of the substrate voltage generator pulses of, for example, 200 kHz, corresponding to a pulse interval of 5000 ns, and a pulse length of, for example, 500 ns, i.e. approximately 7 oscillation periods of the high-frequency fundamental of 13.56 MHz, a pulse-to-pause ratio of 1: 9 set.
- a pulse-to-pause ratio 1: 9 set.
- High-frequency power therefore requires a maximum power of the substrate voltage generator pulses of 200 watts, which is obtained via correspondingly large high-frequency amplitudes.
- substrate voltage generator pulses can also be much lower or much higher, for example up to Reach 1200 watts.
- the high-frequency power coupled into the substrate 10 on average over time then amounts in the illustrated example to one tenth of the respective maximum value of the individual pulses.
- the maximum value of the power of an individual substrate voltage generator pulse is thus available as a parameter for setting the high-frequency power coupled into the substrate 10 over time. Therefore, either the maximum power during the
- Substrate voltage generator pulses are set to a fixed value of, for example, 1 kWatt and the pulse-to-pause ratio is regulated in such a way that a preset mean value of the high-frequency power in the
- Substrate 10 is coupled, or vice versa, the pulse-to-pause ratio is fixed and the maximum power during the substrate voltage generator pulses are regulated accordingly so that this temporal average power value is reached.
- a setpoint specification of the high-frequency power to be coupled into the substrate 10 of the machine control of the plasma generator 5 is converted into an analog voltage quantity
- Repetition frequency of individual pulses implemented so that the average power output from the substrate voltage generator 12 and reported back to the machine controller corresponds exactly to the setpoint value as a time average.
- V / f converter construction systems voltage / frequency converters
- VCOs voltage controlled oscillator
- the generation of high-frequency pulses in the specified short-term range with the substrate voltage generator 12 is per se technically relatively unproblematic, since high-frequency generators are commercially available which have a rise and fall time of 30 ns and can handle pulse durations of 100 ns at peak powers up to several kilowatts.
- high-frequency power pulses in the range of a few hundred nanoseconds are preferably generated in such a way that the high-frequency signal always looks the same within a single pulse.
- three full high-frequency oscillation periods of the 13.56 MHz basic oscillation are always cut out for an individual pulse so that the high-frequency signal curve begins at the beginning of each individual pulse with a zero crossing and an increasing sine and at the end of the
- This synchronization of the individual pulse curve and the course of the high-frequency basic oscillation can alternatively also take place in such a way that a positive sine half-wave of the high-frequency basic oscillation begins at the beginning of a single pulse and a positive half-wave ends at the end of an individual pulse, i.e. the single pulse comprises a larger number of positive ones Half sine waves as negative half sine waves.
- a corresponding number of negative sine half-waves as positive sine half-waves can be combined into one by corresponding synchronization under otherwise identical conditions
- Single pulse can be placed by the single pulse begins and ends with a negative sine half-wave of the high-frequency signal.
- Substrate voltage generator 17 generated high-frequency pulse to stochastic deviations in the signal curves of the individual pulses and in particular to slowly fluctuating conditions with regard to the number of positive and negative sine half-waves, which negatively affects the reproducibility of the entire etching process.
- the electronic circuit explained with the aid of FIG. 5 is preferably additionally integrated with the substrate voltage generator 12 in this exemplary embodiment in order to synchronize the individual pulses with the high-frequency fundamental oscillation.
- the circuit according to FIG. 5 initially provides a control device 32 with an integrated frequency generator, which specifies a square-wave signal with the frequency with which the individual pulses are to be coupled into the substrate 10, for example 200 kHz.
- this repetition frequency can alternatively also - from the setpoint specification - with a permanently preselected pulse peak power of the substrate voltage generator 12 an average power of the system control of the plasma set 5 are derived in such a way that the average power given by the substrate voltage generator 12 in the form of individual pulses and reported back to the machine control as the setpoint
- Average power corresponds to what is achieved, for example, by a simple voltage-frequency conversion with appropriate calibration.
- control device 32 is then first converted into an assigned frequency in a U / f converter device 34 known per se and at the same time applied to the D input and the clear input (CLR input) of a D flip-flop 35.
- the D flip-flop 35 thus remains erased (O level at Clear) and cannot be set (O level at D input) as long as the square wave voltage is at an O level.
- an oscillator voltage of a high-frequency generator 31 which is suitably prepared under certain circumstances, is applied via an adjustable phase shifter 30 and generates a high-frequency AC voltage of, for example, 13.56 MHz.
- this output is referred to as the CEX output (“common exciter”).
- the D flip-flop 35 is set each time by the next, subsequent positive sine half-wave of the high-frequency AC voltage of the RF generator 31 and remains set until the square-wave signal of the frequency generator goes from 1 to 1 again 0 switches back and resets the D flip-flop 35 by means of the O level via the clear input.
- the output of the D flip-flop 35 is further connected to the clock input of a monoflop 33 in such a way that the monoflop 33 simultaneously emits a single pulse when the D flip-flop 35 is set, the pulse duration of which is largely via a resistor-capacitor combination integrated in the monoflop 33 free, especially very short ie less than 100 ns can be selected.
- Monoflops 33 are fed to the pulse input of the high-frequency generator 31 and, during the duration of the single pulse applied to the generator output 36, causes a high-frequency output pulse, i.e. one consisting of a few high-frequency oscillation periods
- the output signal at the generator output 36 is always synchronous with the high-frequency fundamental oscillation of the internal high-frequency generator 31, so that the output signal of the substrate voltage generator 12 at the output 36, i.e. the substrate voltage generator pulses generated and coupled in via the substrate 10 always look the same.
- Frequency generator only a single pulse of a selected duration is generated, which is synchronized to the high-frequency AC voltage of the high-frequency generator 31.
- the substrate voltage generator thus generates 12 output pulses of adjustable duration and always the same
- phase shifter 30 between the CEX output of the high-frequency generator 31 and the clock input of the D flip-flop 34 makes it possible to vary the phase position of the high-frequency oscillation periods contained in each individual pulse or output pulse of the high-frequency generator 31 within the pulse width.
- the phase shifter can thus be adjusted in particular so that the high-frequency oscillation periods of the alternating voltage begin with the onset of the output pulse of the substrate voltage generator 12 and with the
- each output pulse comprises just a whole number of oscillation periods or sine half-waves.
- the phase shifter 30 is a coaxial cable of a defined length as a delay line.
- the circuit described in FIG. 5 is merely an example. In their place, other devices, for example a synchronous divider, which divides the frequency of the generator-internal oscillator and derives individual pulses and pauses between the individual pulses, can also be used.
- a synchronous divider which divides the frequency of the generator-internal oscillator and derives individual pulses and pauses between the individual pulses
- bias voltage As is known, a negative is produced on a substrate electrode 11 which is exposed to a plasma 14 and to which a high-frequency voltage or high-frequency power is applied via the substrate voltage generator 12 DC voltage against the plasma 14 and against earth potential.
- This direct voltage called “bias voltage” or “self-bias” results from the different mobility of electrons and positive ions in the alternating electric field. While the light ones
- Electrons instantaneously follow the high-frequency alternating field and can very easily reach the substrate electrode 11 during the positive half-waves of the alternating voltage, this is less and less possible for the much heavier positive ions during the negative half-waves of the alternating voltage with increasing frequency of the alternating electrical field.
- the substrate electrode 11 is negatively charged by the excess of incoming electrons compared to the incoming positive ions until the charge becomes saturated and, on average, as many electrons as positively charged ions reach the substrate electrode 11.
- the substrate electrode voltage corresponds to this saturation value of the negative charge.
- FIG. 6 shows a simple electrical equivalent circuit diagram for a substrate electrode surface element 37 which is exposed to a plasma 14 and is supplied with a high-frequency power from the substrate voltage generator 12.
- the coupling to earth takes place via the plasma 14, which results from the parallel connection of resistor R and diode D is symbolized.
- the diode D takes into account the effect of self-rectification through the different mobility of electrons and ions in the plasma 14, the resistance R of the
- the capacitance C is essentially an apparatus constant of the structure of the substrate electrode 11.
- a substrate electrode voltage builds up on the substrate electrode 11 at the beginning of each pulse, which after a number of high-frequency oscillation periods reaches a saturation value and remains there until the end of the pulse. After the end of the high-frequency oscillation package, this substrate electrode voltage then decays again during the pulse pause due to discharge processes.
- a typical number of oscillation periods, which is required to achieve a stationary substrate electrode voltage, is at a high frequency of 13.56 MHz and a high-density inductively coupled plasma 14, which is in contact with the substrate electrode, at about 20 to 100 oscillation periods.
- FIG. 7 shows how the substrate electrode voltage U B ⁇ as develops as a function of the number of oscillation periods n of the fundamental oscillation of the high-frequency AC voltage (13, 56 MHz) coupled into the substrate 10.
- the level of local voltage ultimately reached in the event of saturation after many oscillation periods depends essentially on the effective resistance R (energy dissipation into the plasma) and the capacitance C of the capacitor
- the saturation value of the substrate electrode voltage which occurs after many oscillation periods on the substrate surface, thus depends to a large extent on the plasma resistance R (see FIG. 6), ie on the energy dissipation into the plasma 14, which, however, is generally inhomogeneous laterally across the substrate 10.
- the substrate surface 10 no longer represents an equipotential surface, but rather occurring voltage gradients from the center of the substrate to the edge of the substrate act as an electrical lens with respect to the plasma 14, which ultimately leads to a deflection of the ions accelerated to the substrate 10 from the vertical and thus to interference in the generated etching profiles leads.
- Each substrate electrode power pulse thus starts from an identical, defined, discharged initial state of the substrate surface.
- High-frequency peak performances are operated during the individual impulses.
- phase shifter 31 high-frequency generator 32 control device 33 monoflop 34 U / f converter device 35 D flip-flop 36 generator output 37 substrate electrode surface
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE19933842 | 1999-07-20 | ||
DE19933842A DE19933842A1 (de) | 1999-07-20 | 1999-07-20 | Vorrichtung und Verfahren zum Ätzen eines Substrates mittels eines induktiv gekoppelten Plasmas |
PCT/DE2000/001835 WO2001006539A1 (de) | 1999-07-20 | 2000-06-06 | Vorrichtung und verfahren zum ätzen eines substrates mittels eines induktiv gekoppelten plasmas |
Publications (1)
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EP1112587A1 true EP1112587A1 (de) | 2001-07-04 |
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EP00949074A Withdrawn EP1112587A1 (de) | 1999-07-20 | 2000-06-06 | Vorrichtung und verfahren zum ätzen eines substrates mittels eines induktiv gekoppelten plasmas |
Country Status (6)
Country | Link |
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US (1) | US7811941B1 (de) |
EP (1) | EP1112587A1 (de) |
JP (1) | JP4690618B2 (de) |
KR (1) | KR100752064B1 (de) |
DE (1) | DE19933842A1 (de) |
WO (1) | WO2001006539A1 (de) |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7361287B2 (en) | 1999-04-30 | 2008-04-22 | Robert Bosch Gmbh | Method for etching structures in an etching body by means of a plasma |
DE19957169A1 (de) | 1999-11-27 | 2001-06-13 | Bosch Gmbh Robert | Plasmaätzverfahren mit gepulster Substratelektrodenleistung |
DE10104613A1 (de) * | 2001-02-02 | 2002-08-22 | Bosch Gmbh Robert | Plasmaanlage und Verfahren zur Erzeugung einer Funktionsbeschichtung |
DE10104614A1 (de) * | 2001-02-02 | 2002-08-22 | Bosch Gmbh Robert | Plasmaanlage und Verfahren zur Erzeugung einer Funktionsbeschichtung |
DE10309711A1 (de) | 2001-09-14 | 2004-09-16 | Robert Bosch Gmbh | Verfahren zum Einätzen von Strukturen in einem Ätzkörper mit einem Plasma |
DE10147998A1 (de) * | 2001-09-28 | 2003-04-10 | Unaxis Balzers Ag | Verfahren und Vorrichtung zur Erzeugung eines Plasmas |
DE10209763A1 (de) | 2002-03-05 | 2003-10-02 | Bosch Gmbh Robert | Vorrichtung und Verfahren zum anisotropen Plasmaätzen eines Substrates, insbesondere eines Siliziumkörpers |
DE10237249B4 (de) * | 2002-08-14 | 2014-12-18 | Excelitas Technologies Singapore Pte Ltd | Verfahren zum selektiven Abtragen von Material aus der Oberfläche eines Substrats |
DE10247913A1 (de) | 2002-10-14 | 2004-04-22 | Robert Bosch Gmbh | Plasmaanlage und Verfahren zum anisotropen Einätzen von Strukturen in ein Substrat |
US20040097077A1 (en) * | 2002-11-15 | 2004-05-20 | Applied Materials, Inc. | Method and apparatus for etching a deep trench |
KR101286240B1 (ko) * | 2007-10-23 | 2013-07-15 | 삼성전자주식회사 | 반도체 구조물의 형상을 예정하는 공정 파라 메타의 예측시스템, 상기 공정 파라 메타의 예측 시스템을 가지는반도체 제조 장비 및 그 장비의 사용방법 |
JP5319150B2 (ja) * | 2008-03-31 | 2013-10-16 | 東京エレクトロン株式会社 | プラズマ処理装置及びプラズマ処理方法及びコンピュータ読み取り可能な記憶媒体 |
KR101528528B1 (ko) * | 2008-05-14 | 2015-06-12 | 어플라이드 머티어리얼스, 인코포레이티드 | Rf 전력 전달을 위한 시간 분해된 조정 방식을 이용하는 펄스화된 플라즈마 처리를 위한 방법 및 장치 |
JP5295833B2 (ja) * | 2008-09-24 | 2013-09-18 | 株式会社東芝 | 基板処理装置および基板処理方法 |
US9287086B2 (en) * | 2010-04-26 | 2016-03-15 | Advanced Energy Industries, Inc. | System, method and apparatus for controlling ion energy distribution |
US8692467B2 (en) | 2011-07-06 | 2014-04-08 | Lam Research Corporation | Synchronized and shortened master-slave RF pulsing in a plasma processing chamber |
DE102011086551B4 (de) * | 2011-11-17 | 2023-02-23 | Siemens Healthcare Gmbh | Flexible Impedanzanpassung für einen pulsstromversorgten Mikrowellengenerator |
US9401264B2 (en) * | 2013-10-01 | 2016-07-26 | Lam Research Corporation | Control of impedance of RF delivery path |
US9337000B2 (en) * | 2013-10-01 | 2016-05-10 | Lam Research Corporation | Control of impedance of RF return path |
KR102010321B1 (ko) | 2013-01-10 | 2019-08-13 | 삼성전자주식회사 | 플라즈마 처리 방법과 상기 방법을 이용할 수 있는 장치들 |
US9153483B2 (en) * | 2013-10-30 | 2015-10-06 | Taiwan Semiconductor Manufacturing Company, Ltd. | Method of semiconductor integrated circuit fabrication |
GB201502453D0 (en) * | 2015-02-13 | 2015-04-01 | Spts Technologies Ltd | Plasma producing apparatus |
DE102015014256B4 (de) | 2015-11-05 | 2020-06-18 | Airbus Defence and Space GmbH | Mikroelektronisches Modul zur Reinigung einer Oberfläche, Modularray und Verfahren zur Reinigung einer Oberfläche |
DE102016008945A1 (de) * | 2016-07-26 | 2018-02-01 | Airbus Defence and Space GmbH | Mikroelektrisches Modul zur Veränderung der elektromagnetischen Signatur einer Oberfläche, Modularray und Verfahren zur Veränderung der elektromagnetischen Signatur einer Oberfläche |
US10002746B1 (en) * | 2017-09-13 | 2018-06-19 | Lam Research Corporation | Multi regime plasma wafer processing to increase directionality of ions |
CN109273341B (zh) * | 2018-10-18 | 2021-01-08 | 北京北方华创微电子装备有限公司 | 一种等离子体工艺方法 |
DE102020100872B4 (de) * | 2020-01-15 | 2021-08-05 | Ferdinand-Braun-Institut gGmbH, Leibniz- Institut für Höchstfrequenztechnik | Resonator und Leistungsoszillator zum Aufbau einer integrierten Plasmaquelle sowie deren Verwendung |
JP7446146B2 (ja) * | 2020-04-09 | 2024-03-08 | 株式会社ディスコ | ウェーハの加工方法 |
JP7417569B2 (ja) * | 2021-10-29 | 2024-01-18 | 株式会社Kokusai Electric | 基板処理装置、半導体装置の製造方法及びプログラム |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000079579A2 (de) * | 1999-06-18 | 2000-12-28 | Robert Bosch Gmbh | Vorrichtung und verfahren zum hochratenätzen eines substrates mit einer plasmaätzanlage und vorrichtung und verfahren zum zünden eines plasmas und hochregeln oder pulsen der plasmaleistung |
EP1203396A1 (de) * | 1999-07-20 | 2002-05-08 | Robert Bosch Gmbh | Vorrichtung und verfahren zum ätzen eines substrates mittels eines induktiv gekoppelten plasmas |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8516537D0 (en) * | 1985-06-29 | 1985-07-31 | Standard Telephones Cables Ltd | Pulsed plasma apparatus |
JPS6479372A (en) * | 1987-09-18 | 1989-03-24 | Citizen Watch Co Ltd | Coating method with hard carbon film |
KR100281345B1 (ko) * | 1992-12-01 | 2001-03-02 | 조셉 제이. 스위니 | 전자기 결합성 플래너 플라즈마 장치에서의 산화물 에칭 공정 |
DE4241045C1 (de) | 1992-12-05 | 1994-05-26 | Bosch Gmbh Robert | Verfahren zum anisotropen Ätzen von Silicium |
JP3279038B2 (ja) * | 1994-01-31 | 2002-04-30 | ソニー株式会社 | プラズマ装置およびこれを用いたプラズマ処理方法 |
JP3365067B2 (ja) * | 1994-02-10 | 2003-01-08 | ソニー株式会社 | プラズマ装置およびこれを用いたプラズマ処理方法 |
US5558718A (en) * | 1994-04-08 | 1996-09-24 | The Regents, University Of California | Pulsed source ion implantation apparatus and method |
JPH0888218A (ja) * | 1994-09-16 | 1996-04-02 | Kokusai Electric Co Ltd | プラズマエッチング方法及びその装置 |
US5779925A (en) * | 1994-10-14 | 1998-07-14 | Fujitsu Limited | Plasma processing with less damage |
US5683538A (en) * | 1994-12-23 | 1997-11-04 | International Business Machines Corporation | Control of etch selectivity |
US5688357A (en) * | 1995-02-15 | 1997-11-18 | Applied Materials, Inc. | Automatic frequency tuning of an RF power source of an inductively coupled plasma reactor |
JPH08222549A (ja) * | 1995-02-16 | 1996-08-30 | Sony Corp | プラズマ処理装置およびプラズマ処理方法 |
US5983828A (en) * | 1995-10-13 | 1999-11-16 | Mattson Technology, Inc. | Apparatus and method for pulsed plasma processing of a semiconductor substrate |
JP3122618B2 (ja) * | 1996-08-23 | 2001-01-09 | 東京エレクトロン株式会社 | プラズマ処理装置 |
JPH1079372A (ja) | 1996-09-03 | 1998-03-24 | Matsushita Electric Ind Co Ltd | プラズマ処理方法及びプラズマ処理装置 |
JP3220394B2 (ja) * | 1996-09-27 | 2001-10-22 | 東京エレクトロン株式会社 | プラズマ処理装置 |
EP0840350A2 (de) * | 1996-11-04 | 1998-05-06 | Applied Materials, Inc. | Plasmagerät und Verfahren mit Ausfilterung von, in der Plasmahülle erzeugten harmonische Schwingungen |
DE19706682C2 (de) * | 1997-02-20 | 1999-01-14 | Bosch Gmbh Robert | Anisotropes fluorbasiertes Plasmaätzverfahren für Silizium |
US5880034A (en) | 1997-04-29 | 1999-03-09 | Princeton University | Reduction of semiconductor structure damage during reactive ion etching |
JP3559429B2 (ja) * | 1997-07-02 | 2004-09-02 | 松下電器産業株式会社 | プラズマ処理方法 |
DE19734278C1 (de) | 1997-08-07 | 1999-02-25 | Bosch Gmbh Robert | Vorrichtung zum anisotropen Ätzen von Substraten |
US6020794A (en) * | 1998-02-09 | 2000-02-01 | Eni Technologies, Inc. | Ratiometric autotuning algorithm for RF plasma generator |
US6085688A (en) * | 1998-03-27 | 2000-07-11 | Applied Materials, Inc. | Method and apparatus for improving processing and reducing charge damage in an inductively coupled plasma reactor |
DE19900179C1 (de) | 1999-01-07 | 2000-02-24 | Bosch Gmbh Robert | Plasmaätzanlage |
DE19919832A1 (de) | 1999-04-30 | 2000-11-09 | Bosch Gmbh Robert | Verfahren zum anisotropen Plasmaätzen von Halbleitern |
-
1999
- 1999-07-20 DE DE19933842A patent/DE19933842A1/de not_active Ceased
-
2000
- 2000-06-06 US US09/762,985 patent/US7811941B1/en not_active Expired - Fee Related
- 2000-06-06 KR KR1020017003514A patent/KR100752064B1/ko not_active IP Right Cessation
- 2000-06-06 JP JP2001511711A patent/JP4690618B2/ja not_active Expired - Fee Related
- 2000-06-06 EP EP00949074A patent/EP1112587A1/de not_active Withdrawn
- 2000-06-06 WO PCT/DE2000/001835 patent/WO2001006539A1/de active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000079579A2 (de) * | 1999-06-18 | 2000-12-28 | Robert Bosch Gmbh | Vorrichtung und verfahren zum hochratenätzen eines substrates mit einer plasmaätzanlage und vorrichtung und verfahren zum zünden eines plasmas und hochregeln oder pulsen der plasmaleistung |
EP1203396A1 (de) * | 1999-07-20 | 2002-05-08 | Robert Bosch Gmbh | Vorrichtung und verfahren zum ätzen eines substrates mittels eines induktiv gekoppelten plasmas |
Non-Patent Citations (1)
Title |
---|
See also references of WO0106539A1 * |
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WO2001006539A1 (de) | 2001-01-25 |
KR20010075207A (ko) | 2001-08-09 |
DE19933842A1 (de) | 2001-02-01 |
JP4690618B2 (ja) | 2011-06-01 |
KR100752064B1 (ko) | 2007-08-28 |
JP2003505868A (ja) | 2003-02-12 |
US7811941B1 (en) | 2010-10-12 |
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