WO2005054543A1 - クリーニング方法 - Google Patents
クリーニング方法 Download PDFInfo
- Publication number
- WO2005054543A1 WO2005054543A1 PCT/JP2004/018055 JP2004018055W WO2005054543A1 WO 2005054543 A1 WO2005054543 A1 WO 2005054543A1 JP 2004018055 W JP2004018055 W JP 2004018055W WO 2005054543 A1 WO2005054543 A1 WO 2005054543A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oxide film
- cleaning
- base material
- metal base
- aluminum
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- 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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
- H01L21/32134—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by liquid etching only
Definitions
- the present invention relates to a cleaning method for removing a metal oxide film adhered to a surface of a metal base material such as a component used in a semiconductor manufacturing apparatus for depositing a thin film on a surface of a substrate.
- a desired integrated circuit is formed by repeatedly performing a film forming process, an etching process, a heat treatment, a reforming process, a crystallization process, and the like on a substrate such as a semiconductor wafer. .
- a film forming apparatus will be described as an example of a semiconductor manufacturing apparatus.
- the film forming apparatus includes a processing container capable of being evacuated, and a shower head provided on a ceiling portion of the processing container.
- a raw material gas and a supporting gas, for example, an oxidizing gas or a reducing gas, are supplied from the gas injection port of the shower head into the processing vessel.
- a thin film is deposited on the surface of the semiconductor wafer or the like heated in the processing container by, for example, CVD (see Japanese Patent Application Laid-Open No. 10-321613).
- the activation energy is low. If a source gas is used, a film forming reaction will occur if the supporting gas is mixed during the transfer of the source gas. Therefore, in order to prevent this, an injection method is adopted in which the source gas comes into contact with the supporting gas only when it is injected from the shower head into the processing vessel. Such an injection method is also called a post-mix method. When the raw material gas and the supporting gas are supplied into the processing container by the post-mix method, each gas flows through a separate flow path in the shower head so as to be partitioned and not mixed. As a result, it is possible to prevent an unnecessary film that causes particles or the like from being deposited in the shower head, and to deposit a required thin film mainly only on the wafer surface.
- hafnium oxide (HfO) hafnium oxide (HfO)
- An object of the present invention is to provide a metal base material made of at least one material selected from the group consisting of aluminum, an aluminum alloy, nickel and a nickel alloy, the metal oxide film adhered to the surface of the metal base material being corroded on the metal base material. Can be removed without causing damage It is to provide a simple cleaning method.
- the inventor has diligently studied a cleaning solution having sufficient selectivity between a metal base material such as aluminum or an aluminum alloy and a metal oxide film such as a hafnium oxide film. As a result, by using a solution containing ammonium fluoride, hydrofluoric acid, and ethylene oxide, or a solution of ammonium fluoride acetic acid as a cleaning solution, such selectivity can be sufficiently achieved.
- the present invention has been accomplished by obtaining the knowledge that the present invention can be exerted.
- the cleaning method according to the present invention provides a metal oxide film attached to the surface of a metal base material made of at least one material selected from the group consisting of aluminum, aluminum alloy, nickel and nickel alloy. Preparing a cleaning solution containing ammonium fluoride, hydrofluoric acid, and ethylene glycol, or a cleaning solution comprising a fusidani ammonium acetic acid solution; and Cleaning the metal base material having the metal oxide film adhered to the surface thereof.
- the metal oxide film is selected from a group consisting of a hafnium oxide film, a zirconium oxide film, a titanium oxide film, a lanthanum oxide film, and a lead zirconate titanate film. Consists of one material.
- Each of these metal oxide films is a high dielectric insulating film and cannot be removed by a halogen-containing gas such as C1F or NF which is generally used at the time of dry cleaning.
- the cleaning step includes immersing the metal base material having the metal oxide film adhered to the surface thereof in the cleaning solution for one hour or more.
- the metal base material is at least a part of a component used in a semiconductor manufacturing apparatus for depositing a thin film on a surface of a substrate, particularly, a shower head for injecting a processing gas.
- FIG. 1 is a cross-sectional view showing a film forming apparatus to which a cleaning method according to the present invention is applied.
- FIG. 2 is a view showing a state where a part of a shower head is cleaned by the cleaning method according to the present invention.
- a film forming apparatus provided with a component serving as a metal base material in the cleaning method of the present invention.
- a film forming apparatus for depositing a hafnium oxide film on a substrate such as a semiconductor wafer using a hafnium organometallic material will be described.
- the film forming apparatus 2 shown in FIG. 1 has a substantially cylindrical processing container 4 made of aluminum or aluminum alloy.
- the shower head 6 blows out a processing gas toward the processing space S from a large number of gas injection ports 10 provided in a gas injection plate 8 constituting the bottom thereof.
- a loading / unloading port 12 for loading / unloading the substrate W into / from the processing container 4 is provided on a side wall of the processing container 4.
- the carry-in / out port 12 is provided with a gate valve 14 that can be opened and closed in an airtight manner.
- an exhaust trapping space 18 communicating with the processing space in the processing container 4 is formed below the processing container 4. Specifically, a large central opening 20 is formed in the bottom 16 of the processing container 4. Further, a bottomed cylindrical partition wall 22 extending downward from the bottom 16 of the processing container 4 is formed corresponding to the central opening 20. The exhaust wall 18 is formed inside the partition wall 22. A cylindrical support 26 extending upward from the bottom 24 of the partition wall 22 is provided. A mounting table 28 is welded to the upper end of the column 26. The support 26 and the mounting table 28 are formed of, for example, quartz glass or ceramic such as A1N.
- the opening 20 of the processing container bottom 16 is set smaller than the diameter of the mounting table 28. As a result, the processing gas force flowing down the outside of the mounting table 28 The air flows into the exhaust space 18 through the opening 20.
- an exhaust port 30 connected to a vacuum exhaust system 32 is formed on the lower side wall of the partition wall 22, an exhaust port 30 connected to a vacuum exhaust system 32 is formed.
- the evacuation system 32 includes an evacuation pipe 34 in which a vacuum pump (not shown) is interposed.
- the evacuation system 32 is capable of evacuating the atmosphere in the processing vessel 4 and the exhaust space 18.
- a pressure adjusting valve (not shown) is provided in the middle of the exhaust pipe 34. By adjusting the valve opening of the pressure adjusting valve, the pressure in the processing container 4 can be maintained at a constant value or can be quickly changed to a desired pressure.
- a heating means 36 including a resistance heater such as a carbon wire is embedded in the mounting table 28 so that the substrate W mounted on the upper surface of the mounting table 28 can be heated.
- the heating means 36 is connected to a power supply line 38 provided in the column 26 so that the power can be supplied while controlling the power!
- the mounting table 28 is formed with a pin through hole 40 penetrating vertically.
- a push-up pin 42 is arranged for each pin hole 40 so as to be vertically movable.
- the lower end of each push-up pin 42 is supported by a push-up ring 44 formed in a ring shape and made of ceramic such as alumina, for example.
- An arm 46 extending from the push-up ring 44 is connected to a retractable rod 48 provided through the container bottom 16.
- the retractable rod 48 can be moved up and down by an actuator 50.
- a bellows 52 for maintaining the airtightness in the processing container 4 is provided between the actuator 50 and the processing container bottom 16.
- the shower head 6 as a part of the film forming apparatus 2 which is a metal base material to be cleaned will be described.
- the shower head 6 is detachably attached to a ring-shaped support plate 54 attached to the upper end of the processing container 4 by a bolt 57 via a sealing member 55 such as an O-ring.
- the shower head 6 includes a cylindrical shower head body 56 having a ceiling plate 7.
- a sealing member 58 such as an O-ring is interposed between the peripheral portion of the support plate 54 and the upper end of the processing container 4 so as to maintain the airtightness in the processing container 4. .
- the shower head 6 is attached to the lower end of the main body 56 by a bolt 9 which is detachably attached.
- the spray plate 8 is provided.
- the entire shower head 6 is formed of aluminum or an aluminum alloy.
- a horizontal partition plate 64 is provided in the shower head body 56.
- a source gas diffusion chamber 60 is formed between the horizontal partition plate 64 and the ceiling plate 7, and a support gas diffusion chamber 62 is formed between the horizontal partition plate 64 and the gas injection plate 8.
- the source gas diffusion room 60 and the support gas diffusion room 62 are connected to a source gas inlet 66A and a support gas inlet 66B provided in the ceiling plate 7, respectively.
- the gas injection plate 8 of the shower head 6 has a plurality of gas injection ports 10 arranged in a lattice with a substantially uniform distribution. These gas injection ports 10 are divided into a source gas injection port 10A and a support gas injection port 10C which are connected to a source gas diffusion chamber 60 and a support gas diffusion chamber 62, respectively. Each support gas injection port 10C is located between the source gas injection ports 10A.
- an organic metal material gas containing Hf (hafnium) is used as a source gas, and an O gas is used as a supporting gas to deposit a thin film of hafnium oxide (HfO) on a substrate.
- HfO hafnium oxide
- the case 2 2 will be described.
- an unprocessed substrate W is loaded into the processing container 4 by the transfer arm (not shown) through the opened gate valve 14 and the loading / unloading port 12. This substrate W is placed on the lifting push-up pins 42. Next, the substrate W is mounted on the upper surface of the mounting table 28 by lowering the push-up pins 42.
- the Hf-containing organometallic material gas which is a raw material gas, is produced by dissolving a liquid or solid organometallic material at room temperature in a solvent, for example, octane, and vaporizing the same in a vaporizer. Then, by continuing the exhaust from the exhaust pipe 34, the atmosphere in the processing container 4 and the exhaust gas trapping space 18 is evacuated. Then, the opening degree of the pressure adjusting valve is adjusted to maintain the atmosphere in the processing space S at a predetermined process pressure. At this time, the temperature of the substrate W The temperature is maintained at a predetermined process temperature by being heated by a heating means 36 provided in the mounting table 28. As a result, a thin film of HfO is formed on the surface of the substrate W.
- the Hf-containing organometallic material gas is decomposed in a relatively short time when introduced into the processing space S where the activity is extremely high.
- the Hf organometallic material itself contains an oxygen atom
- the oxygen atom and the Hf atom are mainly combined to form an oxygen atom on the wafer surface by CVD (Chemical Vapor Deposition) as described above.
- HfO film is deposited
- the supporting gas o gas will support such a reaction.
- the deposition film is formed on the surface of the substrate W and, at the same time, the surface of the gas injection plate 8 of the shower head 6 is also made of an unnecessary material made of hafnium oxide.
- the metal oxide film 70 is deposited. Although this metal oxide film 70 mainly adheres to the surface of the gas injection plate 8 facing the substrate W, the surface of other components, such as the inner wall surface of the processing container 4 and the aluminum However, it will also adhere, albeit slightly, to the surface of aluminum alloy parts.
- the metal oxide film 70 gradually increases in thickness as the number of film forming processes performed on the substrate W increases. Therefore, a cleaning process is performed regularly or irregularly to remove the unnecessary metal oxide film 70.
- the gas injection plate 8 when cleaning the gas injection plate 8 which is a part of the shower head 6, the gas injection plate 8 is removed from the shower head main body 56. As shown in FIG. 2, the gas injection plate 8 is immersed in a cleaning solution 74 filled in a cleaning container 72 for a predetermined time. Thereby, the surface force of the gas injection plate 8 as the metal base material is also removed by dissolving the metal oxide film 70. When cleaning the entire shower head 6, it is immersed in the cleaning solution 74 while removing the force of the support plate 54.
- a cleaning solution containing a fusidani ammonium, hydrofluoric acid, and ethylene glycol, or a cleaning solution containing a fluorinated ammonium acetic acid solution is used as the cleaning solution 74.
- the post-treatment of the shower head 6 is performed after the cleaning process is completed.
- an aluminum-made hafnium (HfO) film actually formed on the surface is made of aluminum and
- both the A1 concentration and the Hf concentration in the cleaning solution 74 before cleaning were below the detection limit of 1 gZg (concentration in the cleaning solution lg).
- the gas injection plate 8 was immersed in the Tally-Jung solution 74 for 1 hour and 4 hours, respectively.
- the A1 concentration was less than 1 ⁇ gZg and the Hf concentration was approximately 85 ⁇ gZg.
- the temperature of the cleaning solution 74 at this time was approximately 25 ° C. at room temperature. Also.
- the concentration of each solute in the tally Jung solution 74, hydrofluoric acid 10.0%, fluoride ammonium - ⁇ beam is 13.5 0/0, ethylene glycol Honoré force 35.0 0/0, hydro 41. 5 0/0.
- HG-4 registered trademark
- HG-4 manufactured by Stella Chemifa Co., Ltd. was used as the tarrying solution 74.
- the hafnium oxide film is removed with sufficient selectivity with respect to aluminum and aluminum alloys. That is, considering the A1 concentration and the Hf concentration in the tally Jung solution after the above-described cleaning, the hafnium oxide film can be removed with approximately 85 times selectivity to aluminum or aluminum-aluminum alloy. Was confirmed. In this case, the metal base material on which the hafnium oxide film was formed as described above was As described above, it was confirmed that immersion in the cleaning solution 74 was preferable.
- Hf concentration was obtained, and it was confirmed that it was preferable as a cleaning solution. Furthermore, a similar experiment was conducted with a cleaning solution using ammonium acetic acid (ammonia fluoride, acetic acid and water), and it was confirmed that the same excellent effect was exhibited.
- ammonium acetic acid ammonia fluoride, acetic acid and water
- a similar metal base material on which a hafnium oxide film and a hafnium silicate film were formed was immersed in a solution composed of diluted hydrofluoric acid (DFH). Then, the hafnium oxide film and the silicate film could be removed, but the surfaces of aluminum and the aluminum alloy were also severely dissolved and corroded. Thus, it was confirmed that the solution composed of diluted hydrofluoric acid (DFH) could not be used as a cleaning solution having selectivity between aluminum or aluminum alloy and hafnium oxide.
- diluted hydrofluoric acid diluted hydrofluoric acid
- the metal base material after each of the above experiments was observed with a microscope. Then, when dilute hydrofluoric acid was used as the cleaning solution, many irregularities were observed on the surface of the metal base material, and it was confirmed that the metal base material was severely corroded. On the other hand, when the cleaning solution 74 of the present invention was used, it was confirmed that there was almost no unevenness on the surface of the base material and there was almost no corrosion.
- the present invention is not limited to this. That is, it goes without saying that the method of the present invention can be applied to all parts made of aluminum, an aluminum alloy, nickel or a nickel alloy, for example, the processing container 4 and various parts in the processing container 4. Furthermore, in the above embodiment, the film of the hafnium oxide was described as an example of the metal oxide film 70 to be removed from the surface of the metal base material, but the present invention is not limited to this. That is, zirconium oxide (zirconium oxide: ZrO, zirconium silicate: ZrSi O, zirconium) containing another metal oxide film, for example, a metal belonging to Group 4 of the periodic table same as Hf.
- zirconium oxide zirconium oxide: ZrO, zirconium silicate: ZrSi O, zirconium
- Aluminate ZrAl 2 O 3
- PZT lead zirconate titanate
- YO yttrium oxide containing a metal of Group 3 of the periodic table, lanthanum oxylan (La 2 O 3), etc.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003406307A JP2005167087A (ja) | 2003-12-04 | 2003-12-04 | クリーニング方法及び半導体製造装置 |
JP2003-406307 | 2003-12-04 |
Publications (1)
Publication Number | Publication Date |
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WO2005054543A1 true WO2005054543A1 (ja) | 2005-06-16 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/018055 WO2005054543A1 (ja) | 2003-12-04 | 2004-12-03 | クリーニング方法 |
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JP (1) | JP2005167087A (ja) |
WO (1) | WO2005054543A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007146270A (ja) * | 2005-10-31 | 2007-06-14 | Tokyo Electron Ltd | ガス供給装置及び基板処理装置 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4826235B2 (ja) | 2005-12-01 | 2011-11-30 | 三菱瓦斯化学株式会社 | 半導体表面処理剤 |
JP4952257B2 (ja) * | 2007-01-11 | 2012-06-13 | 東ソー株式会社 | 半導体製造装置用部材の洗浄用組成物及びそれを用いた洗浄方法 |
JP5130761B2 (ja) * | 2007-03-23 | 2013-01-30 | 東京エレクトロン株式会社 | 載置台構造及び処理装置 |
US8636019B2 (en) * | 2007-04-25 | 2014-01-28 | Edwards Vacuum, Inc. | In-situ removal of semiconductor process residues from dry pump surfaces |
US8231736B2 (en) * | 2007-08-27 | 2012-07-31 | Applied Materials, Inc. | Wet clean process for recovery of anodized chamber parts |
US7736441B2 (en) * | 2007-10-09 | 2010-06-15 | Lam Research Corporation | Cleaning fixtures and methods of cleaning electrode assembly plenums |
JP5365031B2 (ja) * | 2008-03-11 | 2013-12-11 | 東ソー株式会社 | 半導体製造装置部品の洗浄方法 |
WO2021039838A1 (ja) | 2019-08-28 | 2021-03-04 | 株式会社新菱 | ガス孔をもつ半導体製造装置部品の洗浄方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001156054A (ja) * | 1999-11-29 | 2001-06-08 | Semiconductor Energy Lab Co Ltd | 半導体素子の作製方法 |
JP2003332297A (ja) * | 2002-05-10 | 2003-11-21 | Daikin Ind Ltd | エッチング液及びエッチング方法 |
-
2003
- 2003-12-04 JP JP2003406307A patent/JP2005167087A/ja active Pending
-
2004
- 2004-12-03 WO PCT/JP2004/018055 patent/WO2005054543A1/ja not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001156054A (ja) * | 1999-11-29 | 2001-06-08 | Semiconductor Energy Lab Co Ltd | 半導体素子の作製方法 |
JP2003332297A (ja) * | 2002-05-10 | 2003-11-21 | Daikin Ind Ltd | エッチング液及びエッチング方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007146270A (ja) * | 2005-10-31 | 2007-06-14 | Tokyo Electron Ltd | ガス供給装置及び基板処理装置 |
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JP2005167087A (ja) | 2005-06-23 |
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