WO2001045158A1 - Apparatus and concept for minimizing parasitic chemical vapor deposition during atomic layer deposition - Google Patents
Apparatus and concept for minimizing parasitic chemical vapor deposition during atomic layer deposition Download PDFInfo
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- WO2001045158A1 WO2001045158A1 PCT/US2000/032016 US0032016W WO0145158A1 WO 2001045158 A1 WO2001045158 A1 WO 2001045158A1 US 0032016 W US0032016 W US 0032016W WO 0145158 A1 WO0145158 A1 WO 0145158A1
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Definitions
- the present invention is in the area of chemical vapor deposition, and pertains more particularly to new methods and apparatus for depositing films by atomic layer deposition This invention is an extension of these new methods and particularly
- Atomic Layer Deposition ALD
- Atomic Layer Epitaxy a process originally termed Atomic Layer Epitaxy, for which a competent reference is Atomic Layer Epitaxy, edited by T Suntola and M Simpson, published by Blackie, Glasgo and London in 1990 This publication is incorporated herein by reference
- ALD is a process wherein conventional CVD processes are divided into single-monolayer deposition steps, wherein each separate deposition step theoretically goes to saturation at a single molecular or atomic monolayer thickness, and self-terminates
- the deposition is the outcome of chemical reactions between reactive molecular precursors and the substrate
- elements composing the film are delivered as molecular precursors The net reaction must deposit the .
- the metal precursor reaction is typically followed by inert gas purging to eliminate this precursor from the chamber prior to the separate introduction of the other precursor
- This purge step (or sometimes a pump-down step) is key for ALD films without the undesired CVD component
- the last used chemical is removed from the chamber and gas introduction lines, enabling introduction of a different chemical
- the surface is typically prepared to include hydrogen-containing hgands - AH that are reactive with the metal precursor
- Surface - molecule reactions can proceed to react with all the hgands on the surface and deposit a monolayer of the metal with its passivating hgand substrate -AH + ML X — » substrate-AML % + HL, where HL is the exchange reaction by-product
- the initial surface hgands - AH are consumed and the surface becomes covered with L hgands, that cannot further react with the metal precursor - ML Therefore, the reaction self-saturates when all the initial hgands are replaced with -ML N species
- the second type of precursor is used to restore the surface reactivity towards the metal precursor, I e eliminating the L hgands and redepositing AH hgands
- the second precursor is composed of a desired (usually nonmetallic) element - A (I e O, N, S) and hydrogen using, for example H 2 0, NH 3 , or H 2 S
- a desired element - A I e O, N, S
- the reaction -ML + AH / ⁇ -M-AH + HL (for the sake of simplicity the chemical reactions are not balanced) converts the surface back to be AH-covered
- the desired additional element - A is deposited and the hgands L are eliminated as volatile by-product
- the reaction consumes the reactive sites (this time the L terminated sites) and self-saturates when the reactive sites are entirely depleted
- the sequence of surface reactions that restores the surface to the initial point is called the ALD deposition c ⁇ cle Restoration to the initial surface is the keystone of ALD It implies that films can be layered down in equal metered sequences that are all identical in chemical kinetics, deposition per cycle, composition and thickness Self-saturating surface reactions make ALD in
- ALD chemicals such as the ML X and AH 7 in the above example are typically extremely reactive, and will lead to extensive undesired CVD side reactions if they coexist in the chamber even at trace levels Since CVD is a very undesirable companion, fast and efficient purge has been the most difficult and challenging aspect of engineering high throughput ALD apparatuses Chemical delivery lines must be short and free of trapped volume to facilitate efficient purging of chemicals However, some limitation on efficient purge come from line surface outgassing that is difficult to avoid Accordingly, some trace of chemical mixing is impossible to suppress with throughput limited short purge times What is needed is a rapid method of removing trace quantities of the previously used chemical precursor prior to introduction of the desired new chemical precursor
- Our invention which provides the clear and present need, provides an ALD Pre-Reactor as an apparatus and process that eliminates trace amounts of chemical mixing without CVD contribution to the ALD film on the substrates
- a method for minimizing parasitic chemical vapor deposition during an atomic layer deposition process comprising steps of (a) imposing a pre-reaction chamber between gas sources and a substrate to be coated, and (b) heating a surface in the pre-reaction chamber to a temperature sufficient to cause contaminant elements to deposit by CVD reaction on the heated surface
- a pre-reaction chamber for an atomic layer deposition system comprising a passage for delivery of gases in alternating, incremental fashion from a gas source to a gas distribution apparatus, and a heated surface within the pre reaction chamber for causing contaminant elements to deposit prior to the gases entering the gas distribution apparatus
- Fig 1 is a generalized diagram of a reactor and associated apparatus for practicing a radical-assisted sequential CVD process according to an embodiment of the present invention
- Fig 2 is a step diagram illustrating the essential steps of an atomic layer deposition process
- Fig 3 is a step diagram illustrating steps in a radical-assisted CVD process according to an embodiment of the present invention
- Fig 4 illustrates a typical time dependent chemical precursor partial pressure curve for systems with well designed gas flow source and pulsing subsystems
- Fig 5 represents a time dependent chemical precursor partial pressure curve where sharply defined "flow off 1 conditions are achieved as a result of practicing an embodiment of the present invention
- Fig 6 is a generalized diagram of a reactor and associated apparatus for achieving radical assisted sequential CVD according to an improved embodiment of the present invention which eliminates undesired CVD side reactions
- Fig 7 illustrates a second implementation of the reactor in Fig 6
- Fig 8 illustrates a third implementation of the reactor in Fig 6
- Fig 9 illustrates a fourth implementation of the reactor in Fig 6 Description of the Preferred Embodiments
- the inventor has developed an enhanced variation of ALD which alters the conventional surface preparation steps of ALD and overcomes the problems of conventional ALD, producing high throughput without compromising quality
- the inventor terms the new and unique process Radical-A ssisted Sequential CVD (RAS- CVD)
- Fig 1 is a generalized diagram of a system 1 1 for practicing RAS-CVD according to an embodiment of the present invention
- a deposition chamber 13 has a heatable hearth for supporting and heating a substrate 19 to be coated and a gas distribution apparatus, such as a showerhead 15, for delivering gaseous species to the substrate surface to be coated Substrates are introduced and removed from chamber 13 via a valve 21 and substrate-handling apparatus not shown
- Gases are supplied from a gas sourcing and pulsing apparatus 23, which includes metering and valving apparatus for sequentially providing gaseous materials
- An optional treatment apparatus 25 is provided for producing gas radicals from gases supplied from apparatus 23
- radicals are well-known and understood in the art, but will be qualified again here to avoid confusion
- a radical is meant an unstable species
- oxygen is stable in diatomic form, and exists principally in nature in this form
- Diatomic oxygen may, however, be caused to split to monatomic form, or to combine with another atom to produce ozone, a molecule with three atoms
- Both monatomic oxygen and ozone are ladical foims of oxygen, and are more reactive than diatomic oxygen
- the ladicals produced and used are single atom forms of various gases, such as oxygen, hydrogen, and nitrogen, although the invention is not strictly limited to monatomic gases
- Fig 2 is a step diagram of a conventional Atomic Layer Deposition process, and is presented here as contrast and context for the present invention
- a first molecular precursor is pulsed in to a reactor chamber, and reacts with the surface to produce (theoretically) a monolayer of a desired material
- the precursor is a metal- bearing gas, and the material deposited is the metal, Tantalum from TaCls, for example
- step 33 in the conventional process an inert gas is pulsed into the reactor chamber to sweep excess first precursor from the chamber
- a second precursor typically non- metallic
- the primary purpose of this second precursor is to condition the substrate surface back toward reactivity with the first precursor
- the second precursor also provides material from the molecular gas to combine with metal at the surface, forming compounds such as an oxide or a nitride with the freshly-deposited metal
- Fig 3 is a step diagram illustrating steps in a radical-assisted CVD process according to an embodiment of the present invention
- the first steps, steps 41 and 43 are the same as in the conventional process
- a first precursor is pulsed in step 41 to react with the substrate surface forming a monolayer of deposit, and the chamber is purges in step 43
- the next step is unique
- single or multiple radical species are pulsed to the substrate surface to optionally provide second material to the surface and to condition the surface toward reactivity with the first molecular precursor in a subsequent step
- step 41 is repeated
- the cycle is repeated as often as necessary to accomplish the desired film
- Step 45 may be a single step involving a single radical species
- the first precursor may deposit a metal, such as in W from WFc, and the radical species in step 45
- Radical species are reactive atoms or molecular fragments that are chemically unstable and therefore are extremely reactive
- radicals chemisorb to surfaces with virtually 100% efficiency Radicals may be created in a number of ways, and plasma generation has been found to be an efficient and compatible means of preparation
- RAS-CVD processes use only a single molecular precursor, in many cases a metal precursor
- Surface preparation as well as the deposition of nonmetallic elements are accomplished by atom-surface reactions Following the metal precursor reaction, The -ML terminated surface is reacted with hydrogen atoms to convert the surface into -MH and eliminate HL by-product
- atom-surface reactions do not depend on the number density of reactive sites Most atoms (except for noble gases) stick very efficiently to surfaces in an irreversible process because atomic desorption is usually unfavorable
- the atoms are highly mobile on non-reactive sites and very reactive at reactive sites Consequently, atom- surface reactions have linear exposure dependence, as well as high rates
- the -MH surface can be reacted with A atoms to yield a -M-A- surface
- some of the H hgands can be eliminated as AH N
- the -MH surface can be reacted with oxygen atoms to deposit oxide compound
- -MH surface can be reacted again with ML for atomic layer controlled deposition of M metal films
- A is atomic nitrogen
- the surface after the A atomic reaction is terminated with A- and AH
- an additional atomic reaction with hydrogen converts the surface to the desired AH hgands that are reactive towards the metal precursor
- the MH surface can be reacted with a mixture of A and H atoms to convert the surface into -AH terminated surface with one less step All the above described reactions are radical- surface reactions that are fast and efficient and depend linearly on exposure In addition, the final hydrogen reaction results in a complete restoration to the initial surface without any incorporation of impurities
- RAS-CVD Another throughput benefit of RAS-CVD is that a single purge step after the metal precursor step is needed, rather than the two purge steps needed in the conventional process Purge steps are expected by most researchers to be the most significant throughput-limiting step in ALD processes
- RAS-CVD promises longer system uptime and reduced maintenance This is because atomic species can be efficiently quenched on aluminum walls of the deposition module Downstream deposition on the chamber and pumping lines is therefore virtually eliminated
- RAS-CVD eliminates the use of H 0 and NH that are commonly applied for oxides and nitrides deposition (respectively) in the prior art These precursors are notorious to increase maintenance and downtime of vacuum systems
- Atomic hydrogen step - eliminates the hgands L by HL desorption and terminates the surface with hydrogen
- Foi metal nitrides atomic nitrogen is substituted for oxygen
- the oxygen/nitrogen step may be eliminated in favor of a single atomic hydrogen step, such as for tungsten films
- the hydrogen saturated surface after the first atomic hydrogen step is reactive with WFf, to produce the pure metal
- the WN process may be combined with the pure W process to produce alternating W and WN layers in a va ⁇ ety of schemes to suppress polycrystallization and to reduce the resistivity of the barrier layer
- Other properties, such as electromigration may be controlled by an ability to provide a graded layer of WN with reduced nitrogen content at the copper interface for such applications
- Tin oxide from tin tetrachlonde 1 Indium oxide from indium trichloride or t ⁇ methyhndium
- RAS-CVD is compatible in most cases with ALD process hardware
- the significant difference is in production of atomic species and/or other radicals, and in the timing and sequence of gases to the process chamber
- Production of the atomic species can be done in several ways, such as ( 1 ) m-situ plasma generation, (2) intra-showerhead plasma generation, and (3) external generation bv a high-density remote plasma source or by other means such as UV dissociation or dissociation of metastable molecules referring again to Fig 1 , these methods and apparatus are collectively represented by appai atus 25
- m-situ generation is the simplest design, but poses several problems, such as turn on - turn off times that could be a throughput limitation lntra- showerhead generation has been shown to have an advantage of separating the atomic specie generation from the ALD space
- the preferable method at the time of this specification is remote generation by a high-density source, as this is the most versatile method
- the radicals are generated in a remote source and delivered to the ALD volume, distributed by a showerhead over the wafer in process lt will be apparent to tl e skilled artisan that there are a variety of options that may be exercised within the scope of this invention as variations of the embodiments described above some have already been described
- radicals of the needed species such as hydrogen, oxygen, nitrogen
- ALD chambers, gas distribution, valving, timing and the like may vary in many particulars Still further, many metals, oxides nitrides and the like may be produced, and process steps may be
- Fig 4 is a generalized chemical precursor partial pressure vs time curve 46 for a well behaved system using rapid pulsing of the chemical precursor species and purge steps
- the partial pressure 47 of each active chemical precursor is qualitatively shown on the Y axis of the diagram against time on the X axis
- the partial pressure of precursor "A" 49 and precursor "B” 50 are shown for convenience Systems with more than two precursors would behave similarly with distinct partial pressure peaks for each chemical precursor
- Fig 5 is an idealized chemical precursor partial pressure vs. time curve 51 for a well behaved system using rapid pulsing of the chemical precursor species, purge steps, and the innovative Pre-Reactor invention embodied in this patent application
- the partial pressure 52 of each active chemical precursor is qualitatively shown on the Y axis of the diagram against time on the X axis
- the partial pressure of precursor "A" 54 and precursor "B” 55 are shown for convenience Systems with more than two precursors would behave similarly with distinct partial pressure peaks for each chemical precursor
- Fig 6 is a generalized diagram of a system 56 for practicing RAS-CVD according to an additional embodiment of the present invention
- RAS-CVD is used as an example, the inventor intends it to be clear that the apparatus and methods of the present invention are not limited to RAS-CVD, but applicable in general to all sorts of ALD and many other sequential CVD processes
- a deposition chamber 59 has a heatable hearth for supporting and heating a substrate 61 to be coated, and a gas distribution apparatus, such as a showerhead 60, for delivering gaseous species to the substrate surface to be coated.
- Substrates are introduced and removed (item 65) from chamber 59 via a valve 64 and substrate-handling apparatus not shown
- Gases are supplied from a gas sourcing and pulsing apparatus 57, which includes metering and valving apparatus foi sequentially providing gaseous materials
- An optional treatment apparatus 58 is provided for producing gas radicals from gases supplied from apparatus 57
- a Pre- Reactor 66 has been added to this system to provide improved control of unwanted CVD side reactions.
- the pre-reactor may take various forms, and some of the possible variations are shown in Fig. 6, 7, 8 and 9, described in more detail below All of the figures commonly utilize the gas sourcing and pulsing apparatus 57, the optional treatment apparatus for creating radicals 58, the gas distribution apparatus 60, the deposition chamber 59, a heating hearth 62 for heating substrate 61 , a spent chemical effluent system 63, a substrate entry and removal 65 valve 64 These items are common in this exemplary system.
- the gas distribution apparatus such as a showerhead
- the gas distribution apparatus may serve double duty, and be the pre-reactor chamber as well
- the Pre-Reactor 66 is shown as a physically separate chamber which is placed in the process gas pathway between the Optional Treatment Apparatus Producing Gas Radicals and the Gas Distribution showerhead
- the Pre-Reaction process may take place on any surface with sufficient activation energy supplied either by thermal heating, RF plasma, UV or by other means
- Fig 7 is a generalized diagram of a system 67 for practicing RAS-CVD in a further embodiment of the present invention
- two embodiments of the Pre-Reactor 68 are shown The first is the incorporation of the Pre-Reactor 68 into the Gas Distribution showerhead 60.
- the undesired CVD side reactions are caused to occur on a free-standing, thermally heated surface inside the Gas Distribution showerhead 68
- a thermally-heated surface may be provided in a wide variety of ways, and the form of the pre-reactor chamber can take a wide variety of forms as well, such as, for example, a long, coiled, heated conduit
- the rapid depletion of the undesired chemical "tail" eliminates the possibility that the side reaction will occur on the substrate allowing a decrease in the time between each chemical reactant entering the system.
- the necessary thermal input for the pre-reaction is provided by proximity of the showerhead apparatus to substrate 61, with heat transfer from the hearth and the substrate.
- Fig 8 is a generalized diagram of a further embodiment of the present invention providing system 69 for practicing RAS-CVD
- two embodiments of the Pre-Reactor 70 are shown The first is the incorporation of the Pre-Reactor 70 into the Gas Distribution showerhead 60 which is conceptually similar to figure 7
- the undesired CVD side reactions are caused to occur on the heated surface of the Gas Distribution showerhead 68 itself, which is heated in this embodiment by hearth 62 and substrate 61 by virtue of near proximity of these elements to showerhead 60
- the rapid depletion of the undesired chemical "tail" eliminates the possibility that the side reaction will occur on the substrate allowing a decrease in the time between each chemical reactant entering the system
- Fig 9 is a generalized diagram for a system 71 for practicing RAS-CVD in yet a further embodiment of the present invention
- two embodiments of the Pre-Reactor 72 are shown The first is the incorporation of the Pre-Reactor 72 into the Gas Distribution showerhead 60 which is conceptually similar to figure 7
- the undesired CVD side reactions are caused to occur within the combination Gas Distribution showerhead 68 and Pre-Reactor 72 by activating the undesired CVD side reaction using an RF plasma generated within the showerhead
- This process causes rapid depletion of the undesired chemical "tail" and eliminates the possibility that the side reaction will occur on the substrate allowing a decrease in the time between each chemical reactant entering the system
Abstract
Description
Claims
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DE60038250T DE60038250T2 (en) | 1999-12-17 | 2000-11-21 | APPARATUS AND METHOD FOR MINIMIZING PARASITIC CVD DURING ATOMIC LAYER COATING |
EP00982192A EP1238421B1 (en) | 1999-12-17 | 2000-11-21 | Apparatus and method for minimizing parasitic chemical vapor deposition during atomic layer deposition |
JP2001545359A JP2003517731A (en) | 1999-12-17 | 2000-11-21 | Apparatus and method for minimizing parasitic chemical vapor deposition during atomic layer deposition |
AU19254/01A AU1925401A (en) | 1999-12-17 | 2000-11-21 | Apparatus and concept for minimizing parasitic chemical vapor deposition during atomic layer deposition |
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US09/466,100 US6305314B1 (en) | 1999-03-11 | 1999-12-17 | Apparatus and concept for minimizing parasitic chemical vapor deposition during atomic layer deposition |
US09/466,100 | 1999-12-17 |
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EP (1) | EP1238421B1 (en) |
JP (1) | JP2003517731A (en) |
KR (1) | KR100522951B1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
KR20020063234A (en) | 2002-08-01 |
US6451119B2 (en) | 2002-09-17 |
KR100522951B1 (en) | 2005-10-24 |
JP2003517731A (en) | 2003-05-27 |
DE60038250D1 (en) | 2008-04-17 |
US6305314B1 (en) | 2001-10-23 |
US20010000866A1 (en) | 2001-05-10 |
CN1415115A (en) | 2003-04-30 |
ATE388484T1 (en) | 2008-03-15 |
EP1238421A4 (en) | 2006-06-21 |
DE60038250T2 (en) | 2008-06-19 |
AU1925401A (en) | 2001-06-25 |
CN1191614C (en) | 2005-03-02 |
EP1238421B1 (en) | 2008-03-05 |
EP1238421A1 (en) | 2002-09-11 |
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