WO2001046490A1 - Method of cleaning and conditioning plasma reaction chamber - Google Patents
Method of cleaning and conditioning plasma reaction chamber Download PDFInfo
- Publication number
- WO2001046490A1 WO2001046490A1 PCT/US2000/032441 US0032441W WO0146490A1 WO 2001046490 A1 WO2001046490 A1 WO 2001046490A1 US 0032441 W US0032441 W US 0032441W WO 0146490 A1 WO0146490 A1 WO 0146490A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chamber
- conditioning
- gas
- plasma
- cleaning
- Prior art date
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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
-
- 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
- H01J37/32458—Vessel
- H01J37/32477—Vessel characterised by the means for protecting vessels or internal parts, e.g. coatings
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/4401—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber
- C23C16/4404—Coatings or surface treatment on the inside of the reaction chamber or on parts thereof
-
- 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
- H01J37/32798—Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
- H01J37/32853—Hygiene
- H01J37/32862—In situ cleaning of vessels and/or internal parts
Definitions
- U.S. Patent No. 5, 129,958 discloses a method for cleaning a CVD deposition chamber in a semiconductor wafer processing apparatus wherein fluorine residues in the chamber, left from a prior fluorine plasma cleaning step, are contacted with one or more reducing gases such as silane (SiH 4 ), ammonia, hydrogen, phosphine (PH 3 ), diborine (B 2 H 6 ), and arsine (AsH 3 ).
- silane SiH 4
- PH 3 phosphine
- B 2 H 6 diborine
- AsH 3 arsine
- Another technique for cleaning and conditioning interior surfaces of plasma CVD reactors is disclosed in commonly owned U.S. Patent No. 5,647,953, the subject matter of which is hereby incorporated by reference. In the past these cleans were done with a wafer in the chamber to cover the electrode, but it has become more common to do waferless cleans.
- Fluorine residues remaining after the reactor cleaning can be removed by passing a reducing gas such as hydrogen (H 2 ), silane (SiH 4 ), ammonia (NH 4 ), phosphine (PH 3 ), biborine (B 2 H 6 ) or arsine (AsH 3 ) through the reactor.
- a reducing gas such as hydrogen (H 2 ), silane (SiH 4 ), ammonia (NH 4 ), phosphine (PH 3 ), biborine (B 2 H 6 ) or arsine (AsH 3 )
- Chamber conditioning processes are also commonly used where a wafer is placed in the chamber to protect the electrode during conditioning. These conditioning processes are very common for deposition reactors following plasma cleans, and are also common for etch reactors following wet cleans. Sometimes the wafer has a deposited film on it which aids in the conditioning process. As an example, resist coated wafers have commonly been used to accelerate conditioning. Such conditioning steps may use process conditions without bottom electrode power to season the chamber walls.
- conditioning wafers to season the plasma chamber to obtain reproducible process conditions when processing production wafers is that such conditioning wafers add cost and cause slowdown in production. Accordingly, it would be desirable for a conditioning treatment which is more economical in terms of cost and production efficiency.
- FIG. 1 shows 703 nm emission data during a waferless autoclean process in accordance with the invention
- FIG. 2 depicts a pre-etch structure of 0.25 ⁇ m profile test wafers
- FIG. 3 is a comparison of profile wafer endpoint traces following chamber conditioning with resist wafers and following the waferless autoclean process in accordance with the invention
- FIGS. 4a-d are photomicrographs of etched structures after waferless autoclean process and waferless recovery steps in accordance with the invention and FIG. 4e is a photomicrograph of an etched structure processed in a chamber conditioned with resist wafers;
- FIGS. 5a-d are photomicrographs of etched structures after waferless autoclean process and waferless recovery steps in accordance with the invention and
- FIG. 5e is a photomicrograph of an etched structure processed in a chamber conditioned with resist wafers;
- FIGS. 6a-c are photomicrographs of etched structures after waferless autoclean process and waferless recovery steps in accordance with the invention and FIGS. 6d-f are photomicrographs of etched structures processed in a chamber conditioned with resist wafers.
- This invention provides a method of cleaning and conditioning a plasma reaction chamber in which substrates are processed, comprising the steps of cleaning the plasma reaction chamber so as to remove deposits built up on surfaces within the chamber, introducing a conditioning gas comprising a fluorine- containing gas and a carbon-containing gas into the chamber, energizing the conditioning gas into a plasma state, depositing a polymer coating on interior surfaces of the chamber, and processing a substrate in the chamber after the depositing step.
- a conditioning gas comprising a fluorine- containing gas and a carbon-containing gas
- the term "polymer" coating is intended to describe organic films which may contain etch or deposition by-products.
- the energizing step is carried out by exposing the conditioning gas to an inductive field generated by resonating a radio frequency current in an RF antenna coil, the RF antenna coil being disposed external to the chamber, proximate to a dielectric shield which forms a part of an enclosure of the chamber.
- the cleaning step can be carried out by opening the chamber and performing a wet clean or the cleaning step can be carried out by introducing a cleaning gas into the chamber, energizing the cleaning gas into a plasma state, and contacting the interior surfaces with the plasma to remove the deposits.
- the conditioning step is carried out while the chamber does not contain a substrate therein and/or the substrate comprises a production wafer and the processing step is carried out without processing conditioning wafers in the chamber prior to processing the production wafer. Also, the conditioning step can be carried out without applying power to an RF biasing electrode of a substrate support on which the substrate is supported during the processing step.
- the conditioning gas can further comprise a chlorine-containing gas so that the polymer deposited in the depositing step will include chlorine therein and the processing step comprises etching an aluminum layer on the production wafer.
- the conditioning gas can include Cl 2 , BC1 3 , CC1 4 , SiCl 4 or mixture thereof.
- the conditioning step can be carried out in one or more steps using CHF 3 , BC1 3 and/or Cl 2 as the conditioning gas.
- the chamber pressure during the conditioning step can be in the range of from about 5 to 80 mTorr and/or a plasma generating antenna can be supplied 200 to 1000 Watts during the conditioning step.
- This invention provides an economical method of cleaning and conditioning a plasma reaction chamber in which substrates are processed.
- the method includes cleaning the plasma reaction chamber so as to remove deposits built up on surfaces within the chamber, introducing a conditioning gas comprising a fluorine- containing gas and a carbon-containing gas into the chamber, energizing the conditioning gas into a plasma, depositing a polymer coating formed by the plasma on interior surfaces of the chamber, and processing a substrate in the chamber after the depositing step.
- the invention provides a waferless plasma clean recovery process for conditioning chambers used for plasma etching an aluminum film stack.
- the process for plasma etching of Al produces a by-product which deposits throughout the reactor. Eventually this by-product reaches a thickness where it no longer sticks to the reactor wall and particles are shed which contaminate the substrate being etched. When this happens, the reactor must be opened and cleaned with a wet clean process.
- the process of preparing a reactor for cleaning, along with the actual clean process and the steps required to condition the chamber following an open chamber clean can require a substantial amount of time.
- One method for doing this has been to run plasma cleans, which are capable of reducing the etch by-product deposited in the chamber resulting in a extended time between open chamber cleans.
- plasma cleans alter the chamber condition by removing the reactor deposits, there is typically a process shift following the plasma clean.
- the aluminum etch rate, etch profiles and feature CDs critical dimension can shift outside of the acceptable range for the device being manufactured. If a plasma clean is used, wafers are cycled through the chamber to recondition the walls prior to etching product wafers.
- a special wafer type may also be needed. This limits the applicability of plasma clean processes for Al etching in a production environment because it would be disruptive to production flows to have to load special wafers into the chamber and run a conditioning process after a plasma clean. As a result, in production, plasma cleans would not be used and the reactors would need to be opened more frequently for long wet clean procedures. Thus, the reactor availability advantage of using plasma cleans to extend the wet clean time is negated by the burden of reconditioning the chamber with a special wafer type.
- the invention provides a process that can be run without a wafer in the chamber to recondition the chamber following a plasma clean.
- the by-product deposition from Al etching has been shown to contain a large amount of organic material.
- the deposition is present throughout the etch process and participates in the process by providing a source of sidewall passivation, as well as recombination and adsorption sites for reactant species.
- the deposition can be cleaned by a plasma containing O 2 . However this leaves some residual O 2 in the chamber.
- the addition of O 2 to Al etching gases is known to increase the Al etch rates and can have an effect on etch profile results.
- the preferred method for doing this is to run a plasma processing using BC1 3 and CHF 3 .
- an inductively coupled plasma etcher such as the TCP 9600TM etcher available from LAM Research Corporation
- the process is run by applying high RF power to the top electrode (TCPTM power) source but without power applied to the bottom electrode which provides an RF substrate bias during wafer processing. This results in low plasma potential and prevents attack of the wafer chuck.
- BC1 3 is capable of scavenging residual O 2 from the chamber while CHF 3 is a source of deposition of organic materials on the chamber walls.
- BC1 3 is also a source of Cl which is present in the etch by-product deposition.
- Typical process conditions and ranges for a TCP 9600TM etch reactor are shown in Table 1.
- a second step of the waferless recovery process may be required. If the Al etch process ends with a step that does not contain CHF 3 , a final step of the recovery process that eliminates CHF 3 will improve process recovery.
- An example of a 2 step waferless recovery process is shown in Table 2.
- BC1 3 was selected for it's O 2 scavenging capability
- other gases such as CC1 4 and SiCl 4 would be suitable alternatives.
- the chlorine concentration could be raised by adding Cl 2
- many chlorocarbon, fluorocarbon and CFC gases could easily be substituted for CHF 3 as a polymer source.
- Diluent gases such as He and Ar could be added while maintaining an effective process.
- the waferless recovery process can be run without special wafer types, eliminating the need for operator intervention.
- An additional benefit to not needing wafers for the recovery process is that there is minimal loss to production time as there is no overhead time used to load a wafer into the chamber for the clean or conditioning step. The direct result of this is a higher availability of the reactor for etching valuable product.
- the conditioning process can be completed in around 5 minutes or less.
- the conditioning process according to the invention can cut the recovery time following a chamber clean by over 50% , and even 80% or higher.
- the chamber can be conditioned in less time without using or minimizing use of conditioning wafers. Increased availability of the reactor for product, and reduced non-production wafer requirements are both advantageous for increased customer profitability.
- Cycling resist wafers is a very effective method for chamber conditioning and is the recovery procedure recommended after wet clean. This points to the role of carbon in etch by-product as a significant factor in chamber conditioning. Also, the effectiveness of an O 2 WAC for chamber cleaning indicated that the chamber walls are conditioned with organic deposits. Use of an organic depositing chemistry for chamber conditioning could address this issue. The proposed mechanisms were considered and a series of experiments were conducted to determine the significant effects.
- the system was set up to cycle the blanket resist wafer using the baseline Al etch process with the WAC (12 seconds) and WRS process run between each wafer.
- the 3 WRS steps tested are shown in Table 4.
- 30-40 blanket resist wafers were cycled prior to running an Al etch rate test.
- Table 5 shows the etch rate results.
- the Al etch depth is about 4630 A.
- the BC1 3 /CHF 3 process shows that it is possible to recover the desired Al etch rate following the WAC using a WRS. Assuming etch rate to be a primary indicator of process shift, the feasibility of using a WRS to recover the desired process stability following WAC looks very good.
- WAC implementation An important part of WAC implementation will be selecting a WAC frequency that minimizes throughput impact while maximizing effectiveness at maintaining a clean chamber.
- the optical emission at 703 nm was determined to be a suitable WAC endpoint indicator. The signal degrades throughout the WAC process and flattens when the chamber has been adequately cleaned.
- the BC1 3 /CHF 3 WRS was tested on the 9600PTXTM system using the process conditions for the Al etch, WAC, and WRS steps shown in Table 7.
- the system was initially conditioned by cycling 57 blanket resist wafers with the Al etch process conditions.
- the Al etch rate for the conditioned chamber was measured. Following this the chamber was over cleaned using the WAC process conditions with a 7 minute clean time. The 703 nm endpoint signal was used to verify the clean time was sufficient.
- 29 additional blanket resist wafers were cycled through the system using the Al etch process, but the WAC and WRS steps were used between each wafer.
- the Al etch rate was then checked again following a WAC and WRS step.
- the etch depth results are shown in Table 8. The etch rate following the WAC and WRS was not significantly different than the etch rate of the seasoned chamber (1.6% lower).
- FIG. 2 illustrates the profile test wafer structure before etching.
- FIG. 3 shows the endpoint trace for a wafer etched following the 2 step recovery process.
- the endpoint trace closely matches the trace of a wafer etched in a resist conditioned chamber.
- the etch rates through the BARC, Ti and TiN layers match the etch rates of such layers in the resist conditioned chamber. All wafers etched following the 2 step recovery had similar traces.
- FIGS. 4a-e and 5a-e show the etch profiles from wafers etched as part of the WAC and WRS matrix compared to the result of etching in a resist conditioned chamber.
- the differences in etch profile between the wafers is subtle in most cases showing that the 2 step recovery process has a reasonable process window.
- Some notable trends from the matrix include:
- a chlorine base second recovery step improves the etch profile recovery.
- FIGS. 6a-f show additional SEMs comparing the result of wafer 19 to the conditioned chamber result. Note in these SEMs the profile of isolated features is also reproduced, and the resist profile and sidewall deposition are matched by the
- Process recovery for etching aluminum after WAC requires that a proper balance be achieved between organic deposition in the chamber and chlorination of the chamber walls.
- Process recovery for the CHF 3 additive etch process where the etch profile is more sensitive to chemistry balance has been demonstrated.
- WRS matrix shows that a 2 step recovery process can be tuned to balance the organic and chlorinated composition in the chamber to a "conditioned" state following the WAC.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00983789A EP1252361B1 (en) | 1999-12-22 | 2000-12-08 | Method of cleaning and conditioning plasma reaction chamber |
AU20499/01A AU2049901A (en) | 1999-12-22 | 2000-12-08 | Method of cleaning and conditioning plasma reaction chamber |
JP2001546982A JP4995390B2 (en) | 1999-12-22 | 2000-12-08 | Method for cleaning and conditioning a plasma reaction chamber |
DE60042892T DE60042892D1 (en) | 1999-12-22 | 2000-12-08 | Method for purifying and conditioning a plasma reaction chamber |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US09/469,286 US6350697B1 (en) | 1999-12-22 | 1999-12-22 | Method of cleaning and conditioning plasma reaction chamber |
US09/469,286 | 1999-12-22 |
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WO2001046490A1 true WO2001046490A1 (en) | 2001-06-28 |
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PCT/US2000/032441 WO2001046490A1 (en) | 1999-12-22 | 2000-12-08 | Method of cleaning and conditioning plasma reaction chamber |
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US (1) | US6350697B1 (en) |
EP (1) | EP1252361B1 (en) |
JP (1) | JP4995390B2 (en) |
KR (1) | KR100789684B1 (en) |
CN (1) | CN1252313C (en) |
AU (1) | AU2049901A (en) |
DE (1) | DE60042892D1 (en) |
TW (1) | TW487988B (en) |
WO (1) | WO2001046490A1 (en) |
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Also Published As
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AU2049901A (en) | 2001-07-03 |
KR20020062367A (en) | 2002-07-25 |
CN1411514A (en) | 2003-04-16 |
DE60042892D1 (en) | 2009-10-15 |
EP1252361A1 (en) | 2002-10-30 |
EP1252361B1 (en) | 2009-09-02 |
KR100789684B1 (en) | 2008-01-02 |
CN1252313C (en) | 2006-04-19 |
JP4995390B2 (en) | 2012-08-08 |
US6350697B1 (en) | 2002-02-26 |
JP2003518328A (en) | 2003-06-03 |
TW487988B (en) | 2002-05-21 |
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