WO2000055895A1 - Method of forming an aluminum oxide film - Google Patents
Method of forming an aluminum oxide film Download PDFInfo
- Publication number
- WO2000055895A1 WO2000055895A1 PCT/KR2000/000204 KR0000204W WO0055895A1 WO 2000055895 A1 WO2000055895 A1 WO 2000055895A1 KR 0000204 W KR0000204 W KR 0000204W WO 0055895 A1 WO0055895 A1 WO 0055895A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- aluminum oxide
- oxide film
- forming
- substrate
- alcohol
- 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.)
- Ceased
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Classifications
-
- H10P14/6339—
-
- H10P14/69391—
Definitions
- the present invention relates to a method of forming an aluminum oxide film, and more particularly to a method of forming an aluminum oxide film on a substrate for semiconductor devices.
- Aluminum oxide film is well known to be used widely not only for optical purposes but also for protection films, gate oxide films and optical lithography masks for semiconductor devices as shown in the reference 1. (reference 1 : E. Fredriksson and J.O. Carlsson, Journal of Chemical Vapor Deposition, vol. 1, p.
- reference 2 reported the use of aluminum oxide film for protection from hydrogen diffusion by forming an ultra-thin aluminum oxide film on a PZT(PbZrTiO 3 ) dielectric layer of a FeRAM(Ferroelectric Random Access Memory) (reference 2: Sang Min Lee, Young Wun Park, In Son Park, Chang Soo Park, Cha Young Ryu, Sang In Lee, Mun Yong Lee, Abstract of the 5th Korean Semiconductor Society p. 255 (1998)).
- the sequential supply of source materials on a substrate can form a thin film only by a chemical reaction on a substrate surface. Therefore, the latter method can grow a thin film of uniform thickness irrespective of uneven substrate surface, and can control precisely film thickness because the growth of film depends not on process time but on the number of source material supply cycles. It is well described in the "Atomic Layer Epitaxy" edited by T. Suntola and M. Simpson (reference 3: T. Suntola and M. Simpson eds. Atomic Layer Epitaxy, Blackie, London (1990)).
- each source material supply cycle In each source material supply cycle, the film grows by 0.19nm which makes the total film growth rate of 0.38nm/min. This growth rate is too slow to be applied to semiconductor device fabrication. In order to enhance the film growth rate, each source material supply cycle should be shortened.
- water vapor is used in the film growth.
- the water vapor is difficult to evacuate in a vacuum chamber, which makes the decrease of material supply cycle time difficult.
- the reactor and the gas supply unit where the water vapor passes should be kept at high temperature because water vapor is easily condensed in a cold unit. It increases energy consumption and workers may get burned during the operation and maintenance of the equipment.
- the method of forming an aluminum oxide film of the present invention comprises the steps of: preparing gases of organo-aluminum compound and alcohol for forming an aluminum oxide film; and contacting said gases sequentially and repeatedly onto a substrate.
- the number of carbons in the alcohol molecule is preferably from 2 to 6, and more preferably the alcohol is isopropanol which is widely used in the semiconductor device fabrication.
- the organo-aluminum compound is preferably trialkylaluminum, and more preferably the trialkylaluminum is trimethylaluminum.
- trimethylaluminum and isopropanol are gasified and are supplied into a deposition chamber.
- Argon gas is provided as a purge gas between the supplies of the gasified trimethylaluminum and isopropanol. Because isopropanol has a high vapor pressure, it is supplied into the reactor directly using a carrier gas without an additional heating process.
- Trimethylaluminum gas, argon purge gas, isopropanol gas and argon purge gas are sequentially supplied for 2, 2, 2 and 2 seconds, respectively in each cycle which makes the gas supply period of 8 seconds.
- the trimethylaluminum decomposes above 300°C, so the source materials must be supplied at a temperature lower than 300°C to grow a film only by a surface reaction.
- the film growth rate by measuring the film thickness using an ellipsometer is determined to be 0.08nm per source material supply cycle or 0.60nm/min.
- the temperature for gas supply unit and a reactor can be lowered compared to the previous methods. It can, therefore, simplify apparatus necessary for fabricating semiconductor devices and lower manufacturing cost. Furthermore, an aluminum oxide film with superior step coverage can be grown faster than prior art methods.
Landscapes
- Chemical Vapour Deposition (AREA)
- Formation Of Insulating Films (AREA)
Abstract
The present invention relates to a method of forming an aluminum oxide film for use in semiconductor devices on a substrate. Organo-aluminum compound and alcohol, which are sources for the aluminum oxide film formation, are first prepared as gas phases, respectively. Then the gas phase sources are sequentially applied to the substrate to form an aluminum oxide film. In general, alcohol can be evacuated faster than water vapor in a vacuum chamber, which significantly reduces time required for source supply cycle. Therefore, according to the present invention, the growth rate of the aluminum oxide filmn can be increased compared with prior art methods. In addition, the cost associated with semiconductor device fabrication can be reduced because the temperature of both gas supply unit and a reactor can be decreased.
Description
METHOD OF FORMING AN ALUMINUM OXIDE FILM
TECHNICAL FIELD
The present invention relates to a method of forming an aluminum oxide film, and more particularly to a method of forming an aluminum oxide film on a substrate for semiconductor devices.
BACKGROUND ART
Aluminum oxide film is well known to be used widely not only for optical purposes but also for protection films, gate oxide films and optical lithography masks for semiconductor devices as shown in the reference 1. (reference 1 : E. Fredriksson and J.O. Carlsson, Journal of Chemical Vapor Deposition, vol. 1, p. 333 (1993)) Furthermore, reference 2 reported the use of aluminum oxide film for protection from hydrogen diffusion by forming an ultra-thin aluminum oxide film on a PZT(PbZrTiO3) dielectric layer of a FeRAM(Ferroelectric Random Access Memory) (reference 2: Sang Min Lee, Young Kwan Park, In Son Park, Chang Soo Park, Cha Young Ryu, Sang In Lee, Mun Yong Lee, Abstract of the 5th Korean Semiconductor Society p. 255 (1998)).
Compared to the conventional chemical vapor deposition method which provides source materials of a thin film simultaneously, the sequential supply of source materials on a substrate can form a thin film only by a chemical reaction on a substrate surface. Therefore, the latter method can grow a thin film of uniform thickness irrespective of uneven substrate surface, and can control precisely film thickness because the growth of film depends not on process time but on the number of source material supply cycles. It is well described in the "Atomic Layer Epitaxy" edited by T. Suntola and M. Simpson (reference 3: T. Suntola and M. Simpson eds. Atomic Layer Epitaxy, Blackie, London (1990)).
As an application of the latter method, the formation of aluminum oxide film having a uniform thickness on an uneven substrate surface by a sequential supply of trimethylaluminum and water vapor was proposed in the reference 4. (reference 4: Y. Kim, S. M. Lee, C. S. Park, S. I. Lee, and M. Y. Lee, Applied Physics Letters, vol. 71, p. 3604 (1997)). Referring to the reference 4, trimethylaluminum, argon, water vapor
and argon are sequentially supplied for 1, 14, 1, and 14 seconds, respectively in each cycle while keeping the substrate at a temperature of 370°C in a reactor heated at 150°C. In each source material supply cycle, the film grows by 0.19nm which makes the total film growth rate of 0.38nm/min. This growth rate is too slow to be applied to semiconductor device fabrication. In order to enhance the film growth rate, each source material supply cycle should be shortened. In the technology disclosed in the reference 4, water vapor is used in the film growth. However, the water vapor is difficult to evacuate in a vacuum chamber, which makes the decrease of material supply cycle time difficult. Furthermore, in case of using water vapor for the formation of an aluminum oxide film, the reactor and the gas supply unit where the water vapor passes should be kept at high temperature because water vapor is easily condensed in a cold unit. It increases energy consumption and workers may get burned during the operation and maintenance of the equipment.
DISCLOSURE OF INVENTION Accordingly, it is an object of the present invention to provide a method of forming an aluminum oxide film by employing source materials which can be easily evacuated in a vacuum chamber and are less susceptible to condense in a reactor. It is another object of the present invention is to provide a method which can form an aluminum oxide film faster than the method which employs water vapor.
In order to achieve the above objects, the method of forming an aluminum oxide film of the present invention comprises the steps of: preparing gases of organo-aluminum compound and alcohol for forming an aluminum oxide film; and contacting said gases sequentially and repeatedly onto a substrate.
The number of carbons in the alcohol molecule is preferably from 2 to 6, and more preferably the alcohol is isopropanol which is widely used in the semiconductor device fabrication.
Furthermore, the organo-aluminum compound is preferably trialkylaluminum, and more preferably the trialkylaluminum is trimethylaluminum.
BEST MODE FOR CARRYING OUT THE INVENTION
Preferred embodiment of the present invention will be described below.
First of all, trimethylaluminum and isopropanol are gasified and are supplied into a deposition chamber. Argon gas is provided as a purge gas between the supplies of the gasified trimethylaluminum and isopropanol. Because isopropanol has a high vapor pressure, it is supplied into the reactor directly using a carrier gas without an additional heating process. Trimethylaluminum gas, argon purge gas, isopropanol gas and argon purge gas are sequentially supplied for 2, 2, 2 and 2 seconds, respectively in each cycle which makes the gas supply period of 8 seconds. The trimethylaluminum decomposes above 300°C, so the source materials must be supplied at a temperature lower than 300°C to grow a film only by a surface reaction. When the film is grown on a substrate kept at 250 ~ 290 °C, the film growth rate by measuring the film thickness using an ellipsometer is determined to be 0.08nm per source material supply cycle or 0.60nm/min.
INDUSTRIAL APPLICABILITY
According to this invention, the temperature for gas supply unit and a reactor can be lowered compared to the previous methods. It can, therefore, simplify apparatus necessary for fabricating semiconductor devices and lower manufacturing cost. Furthermore, an aluminum oxide film with superior step coverage can be grown faster than prior art methods.
Claims
1. A method of forming an aluminum oxide film comprising the steps of: preparing gases of organo-aluminum compound and alcohol for forming an aluminum oxide film; and contacting said gases sequentially and repeatedly onto a substrate.
2. The method according to claim 1 , wherein the number of carbons in said alcohol molecule is from 2 to 6.
3. The method according to claim 2, wherein said alcohol is isopropanol.
4. The method according to any of claims 1 to 3, wherein said orgoano-aluminum compound is trialkylaluminum.
5. The method according to claim 4, wherein said trialkylaluminum is trimethylaluminum.
6. The method according to claim 1, wherein the temperature of substrate is kept at 250 ~- 290°C at the step of contacting said gases sequentially and repeatedly onto a substrate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1999/8740 | 1999-03-16 | ||
| KR1019990008740A KR20000060438A (en) | 1999-03-16 | 1999-03-16 | Method for forming aluminum oxide films |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000055895A1 true WO2000055895A1 (en) | 2000-09-21 |
Family
ID=19576654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2000/000204 Ceased WO2000055895A1 (en) | 1999-03-16 | 2000-03-14 | Method of forming an aluminum oxide film |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20000060438A (en) |
| WO (1) | WO2000055895A1 (en) |
Cited By (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002031875A3 (en) * | 2000-10-10 | 2003-01-09 | Asm Inc | Dielectric interface films and methods therefor |
| WO2004002154A2 (en) | 2002-06-25 | 2003-12-31 | Televes, S.A. | System for the reception, processing, and distribution of signals |
| US6727169B1 (en) | 1999-10-15 | 2004-04-27 | Asm International, N.V. | Method of making conformal lining layers for damascene metallization |
| US6743475B2 (en) | 2000-10-23 | 2004-06-01 | Asm International N.V. | Process for producing aluminum oxide films at low temperatures |
| US6811814B2 (en) | 2001-01-16 | 2004-11-02 | Applied Materials, Inc. | Method for growing thin films by catalytic enhancement |
| US6902763B1 (en) | 1999-10-15 | 2005-06-07 | Asm International N.V. | Method for depositing nanolaminate thin films on sensitive surfaces |
| US7438760B2 (en) | 2005-02-04 | 2008-10-21 | Asm America, Inc. | Methods of making substitutionally carbon-doped crystalline Si-containing materials by chemical vapor deposition |
| US7476420B2 (en) | 2000-10-23 | 2009-01-13 | Asm International N.V. | Process for producing metal oxide films at low temperatures |
| US7608549B2 (en) | 2005-03-15 | 2009-10-27 | Asm America, Inc. | Method of forming non-conformal layers |
| US7749871B2 (en) | 1999-10-15 | 2010-07-06 | Asm International N.V. | Method for depositing nanolaminate thin films on sensitive surfaces |
| US8841182B1 (en) | 2013-03-14 | 2014-09-23 | Asm Ip Holding B.V. | Silane and borane treatments for titanium carbide films |
| US8846550B1 (en) | 2013-03-14 | 2014-09-30 | Asm Ip Holding B.V. | Silane or borane treatment of metal thin films |
| US8921205B2 (en) | 2002-08-14 | 2014-12-30 | Asm America, Inc. | Deposition of amorphous silicon-containing films |
| US8993055B2 (en) | 2005-10-27 | 2015-03-31 | Asm International N.V. | Enhanced thin film deposition |
| US9312131B2 (en) | 2006-06-07 | 2016-04-12 | Asm America, Inc. | Selective epitaxial formation of semiconductive films |
| US9394609B2 (en) | 2014-02-13 | 2016-07-19 | Asm Ip Holding B.V. | Atomic layer deposition of aluminum fluoride thin films |
| US9631272B2 (en) | 2008-04-16 | 2017-04-25 | Asm America, Inc. | Atomic layer deposition of metal carbide films using aluminum hydrocarbon compounds |
| US9704716B2 (en) | 2013-03-13 | 2017-07-11 | Asm Ip Holding B.V. | Deposition of smooth metal nitride films |
| US9786492B2 (en) | 2015-11-12 | 2017-10-10 | Asm Ip Holding B.V. | Formation of SiOCN thin films |
| US9786491B2 (en) | 2015-11-12 | 2017-10-10 | Asm Ip Holding B.V. | Formation of SiOCN thin films |
| US9941425B2 (en) | 2015-10-16 | 2018-04-10 | Asm Ip Holdings B.V. | Photoactive devices and materials |
| US10002936B2 (en) | 2014-10-23 | 2018-06-19 | Asm Ip Holding B.V. | Titanium aluminum and tantalum aluminum thin films |
| US10186420B2 (en) | 2016-11-29 | 2019-01-22 | Asm Ip Holding B.V. | Formation of silicon-containing thin films |
| US10504901B2 (en) | 2017-04-26 | 2019-12-10 | Asm Ip Holding B.V. | Substrate processing method and device manufactured using the same |
| US10600637B2 (en) | 2016-05-06 | 2020-03-24 | Asm Ip Holding B.V. | Formation of SiOC thin films |
| US10643925B2 (en) | 2014-04-17 | 2020-05-05 | Asm Ip Holding B.V. | Fluorine-containing conductive films |
| US10847529B2 (en) | 2017-04-13 | 2020-11-24 | Asm Ip Holding B.V. | Substrate processing method and device manufactured by the same |
| US10991573B2 (en) | 2017-12-04 | 2021-04-27 | Asm Ip Holding B.V. | Uniform deposition of SiOC on dielectric and metal surfaces |
| US11158500B2 (en) | 2017-05-05 | 2021-10-26 | Asm Ip Holding B.V. | Plasma enhanced deposition processes for controlled formation of oxygen containing thin films |
| US12142479B2 (en) | 2020-01-17 | 2024-11-12 | Asm Ip Holding B.V. | Formation of SiOCN thin films |
| US12341005B2 (en) | 2020-01-17 | 2025-06-24 | Asm Ip Holding B.V. | Formation of SiCN thin films |
| US12354877B2 (en) | 2020-06-24 | 2025-07-08 | Asm Ip Holding B.V. | Vapor deposition of films comprising molybdenum |
| US12359315B2 (en) | 2019-02-14 | 2025-07-15 | Asm Ip Holding B.V. | Deposition of oxides and nitrides |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010114050A (en) * | 2000-06-20 | 2001-12-29 | 박종섭 | Method of forming a Al2O3 layer in a semiconductor device |
-
1999
- 1999-03-16 KR KR1019990008740A patent/KR20000060438A/en not_active Withdrawn
-
2000
- 2000-03-14 WO PCT/KR2000/000204 patent/WO2000055895A1/en not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| APPLIED PHYSICS LETTERS, vol. 71, 1997, pages 3604 * |
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| US6727169B1 (en) | 1999-10-15 | 2004-04-27 | Asm International, N.V. | Method of making conformal lining layers for damascene metallization |
| US6902763B1 (en) | 1999-10-15 | 2005-06-07 | Asm International N.V. | Method for depositing nanolaminate thin films on sensitive surfaces |
| US7102235B2 (en) | 1999-10-15 | 2006-09-05 | Asm International N.V. | Conformal lining layers for damascene metallization |
| US6660660B2 (en) | 2000-10-10 | 2003-12-09 | Asm International, Nv. | Methods for making a dielectric stack in an integrated circuit |
| US7038284B2 (en) | 2000-10-10 | 2006-05-02 | Asm International, N.V. | Methods for making a dielectric stack in an integrated circuit |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20000060438A (en) | 2000-10-16 |
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