WO1999005704A1 - Method for washing silicon wafer - Google Patents
Method for washing silicon wafer Download PDFInfo
- Publication number
- WO1999005704A1 WO1999005704A1 PCT/US1998/015358 US9815358W WO9905704A1 WO 1999005704 A1 WO1999005704 A1 WO 1999005704A1 US 9815358 W US9815358 W US 9815358W WO 9905704 A1 WO9905704 A1 WO 9905704A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- silicon wafer
- washing
- reforming
- solution
- oxidized film
- Prior art date
Links
Classifications
-
- 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
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/0223—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate
- H01L21/02233—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer
- H01L21/02236—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer group IV semiconductor
- H01L21/02238—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer group IV semiconductor silicon in uncombined form, i.e. pure silicon
-
- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
- H01L21/02299—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer pre-treatment
- H01L21/02307—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer pre-treatment treatment by exposure to a liquid
Definitions
- the present invention relates to a method for washing a silicon wafer. More specifically, the present invention relates to a method for washing a silicon wafer, in which contaminants are removed from the silicon wafer and a surface of the silicon wafer is reformed after the silicon wafer is subjected to an etching treatment.
- the etched wafer is subjected to spin drying, and then subjected to a pretreatment for a thermal treatment (etched slice cleaning) .
- the etched wafer is subjected to an ozone treatment to form an oxidized film on a surface of the silicon wafer, then subjected to spin drying which is followed by a sand blast step or an edge polish step.
- the wafer is then subjected to a pretreatment for a thermal treatment.
- the third method is one used for a specific silicon wafer, in which the silicon wafer is immersed in an inorganic basic solution after an etching step, and then subjected to a pretreatment before a thermal treatment (etched slice cleaning) .
- the silicon wafer is prone to contamination by the atmosphere, a container, and a measuring apparatus, or the like when the silicon wafer is left as it is for a long period of time, since an oxidized film is not present on a surface of the silicon wafer.
- an oxidized film was formed on a surface of a silicon wafer by an ozone treatment so as to prevent the surface of the silicon wafer from being etched and/or contaminated by a chemical agent or the like which is used in a sand blast step or an edge polish step after an etching step.
- spin drying was required after the ozone treatment, it made the process more complex. Further, there was found no means to counter a micro etched-nonuniformity generated after an etching treatment on a surface of the silicon wafer.
- a silicon wafer was immersed in an inorganic basic solution after an etching step so as to remove a micro etched-nonuniformity and a residue of contaminants (a blue-white powder) .
- spin drying was required after the immersion step, it made the process more complex.
- an oxidized film was not formed on a surface of the silicon wafer since the silicon wafer was not subjected to an ozone treatment, and therefore, there was a possibility of having a stain by contamination .
- None of the methods described above contain both an ozone treatment and a measure to counter a micro etched- nonuniformity on a surface of a silicon wafer. Accordingly, each caused a stain and/or a nonuniformity in apparent color in the next step. Additionally, spin drying was required after the ozone treatment or immersion step, thereby making a process more complex. Accordingly, it has been desired to solve these problems with a unification and simplification of a process after an etching treatment.
- the present invention provides a method for washing a silicon wafer which contributes a removal of contaminants, an improvement of a surface reforming, and a unification and simplification of a process after an etching treatment to any kind of silicon wafer by subjecting a silicon wafer to an etching treatment, subjecting a silicon wafer to a washing and reforming treatment with a washing-reforming solution, and forming an oxidized film on a surface of the silicon wafer with a solution for forming an oxidized film.
- a method for washing a silicon wafer after an etching treatment comprising the steps of: (a) subjecting a silicon wafer after etching to washing and reforming using a washing-reforming solution, and
- the silicon wafer is preferably subjected to rinsing after the step (a) and before the step (b) and immersed in warm water after the step (b) and subsequently subjected to hot-air drying.
- the washing-reforming solution is preferably an inorganic basic solution containing hydrogen peroxide or a surface-active agent.
- a silicon wafer is subjected to a washing- reforming treatment with a washing-reforming solution after an etching treatment, and then an oxidized film is formed on a surface of the silicon wafer with a solution for forming an oxidized film.
- an etching action on a surface of a silicon wafer by an inorganic basic solution which is a component constituting a washing-reforming solution cooperates with an etching inhibitory action (surface-oxidizing action, masking action, or the like) by hydrogen peroxide and a surface-active agent. Accordingly, a contaminant residue (blue-white powder) and a micro etched-nonuniformity on a surface of a silicon wafer after etching can be securely removed, thereby greatly controlling apparent inferiority in a device process.
- an oxidized film can be formed on the surface of the silicon wafer with a solution for forming an oxidized film after a washing-reforming treatment, thereby avoiding contamination (stain) on a surface of a silicon wafer.
- a method for washing a silicon wafer contributes a removal of contaminants, an improvement of a surface reforming, and a unification and simplification of a process after an etching treatment to any kind of silicon wafer.
- a method for washing a silicon wafer of the present invention is hereinafter described in detail.
- a silicon wafer is put in a washing-reforming solution after an etching treatment .
- a surface of the silicon wafer is washed and reformed preferably applying ultrasonic waves of 26-40 kHz and 100-600 W for 4-10 minutes .
- the temperature of a washing-reforming solution is preferably maintained at about 35-70°C. This is because when the temperature is lower than 35°C, a surface-active agent in the washing-reforming solution is prone to have separation or suspension, which hinders decomposition of hydrogen peroxide and lowers reaction activity of the washing-reforming solution.
- the silicon wafer is transferred to a rinse vessel containing super deionized water and rinsed preferably applying ultrasonic waves of 26-40 kHz and 100- 600 W for 4-10 minutes with the super deionized water (room temperature) overflowing the rinse vessel.
- the silicon wafer is transferred to a vessel for forming an oxidized film and immersed into a solution for forming an oxidized film preferably applying ultrasonic waves of 26-40 kHz and 100-600 W for 2-10 minutes so as to uniformly form an oxidized film on a surface of the silicon wafer.
- a temperature of the solution for forming an oxidized film is preferably maintained to be 20-
- the silicon wafer is transferred to a vessel containing a warm water having a temperature of 60-90°C and immersed in the warm water for 60-270 seconds.
- the silicon wafer is dried with a hot air having a temperature of 70-90°C to complete a method for washing a silicon wafer of the present invention.
- the washing-reforming liquid used in the present invention is an inorganic basic solution containing hydrogen peroxide or a surface-active agent, and is preferably conditioned as follows so as to etch a silicon wafer at a submicron level or lower with controlling a decrease in thickness of the silicon wafer and a surface roughness as much as possible.
- An inorganic basic solution containing hydrogen peroxide preferably has a composition of hydrogen peroxide, inorganic basic solution, and water with a ratio of (1- 2) : (1-2) : (5-50) , respectively.
- NaOH or KOH can be used as an inorganic basic solution.
- An inorganic basic solution containing a surface- active agent preferably has a composition of 0.01-10.00 wt% of a surface-active agent and 0.05-25.00 wt% of an inorganic basic solution.
- a surface active agent is not particularly limited, and there can be used, for example, polyoxyalkylphenylether, naphthalene sulfonate compound, etc., as a surface-active agent.
- an inorganic basic solution there can be used NaOH, CaC0 3 , Na 2 C0 3 , or K 2 C0 3 .
- an inorganic basic solution containing a surface-active agent enhances an effect of removing a micro etched-nonuniformity more remarkably than an inorganic basic solution containing hydrogen peroxide.
- a solution for forming an oxidized film used in the present invention is an ozone water or SC-1 (H 2 0+H 2 0 2 +NH 4 OH) .
- the ozone water preferably has an ozone concentration of 2-15 ppm so as to enhance throughput.
- a silicon wafer obtained by a method for washing a silicon wafer of the present invention was evaluated by a method shown below.
- a silicon wafer is rotated in the direction of an observation axis with holding the silicon wafer by a vacuum pincette so that a surface of the silicon wafer meets the observation axis at 45° .
- a fluorescent light or a condensed light is applied to a surface of the silicon wafer at a right angle to the observation axis.
- the surface of the silicon wafer was observed by eyes at a site of 30 cm from an observation point for evaluation.
- the surface of the silicon wafer was evaluated for a micro etched-nonuniformity and stain by a rate (%) of a brown area under the fluorescent light and a white area under the condensed light to a surface area of the silicon wafer.
- a silicon wafer was transferred to a washing-reforming vessel after an etching treatment and subjected to washing- reforming with applying ultrasonic waves of 26 kHz and 300 W for 4 minutes.
- a washing-reforming solution one of a potassium hydroxide solution (liquid temperature: 70°C) containing hydrogen peroxide and a potassium hydroxide solution (liquid temperature: 45°C) containing a surface- active agent was used under a condition of blend shown in Table 1.
- the silicon wafer was transferred to a rinse vessel containing a super deionized water and rinsed with applying ultrasonic waves of 26 kHz and 300 W for 4 minutes with the super deionized water (room temperature) overflowing the rinse vessel.
- a silicon wafer is transferred to a vessel for forming an oxidized film and immersed into a solution for forming an oxidized film with applying ultrasonic waves of 26 kHz and 300 W for 4 minutes so as to uniformly form an oxidized film on a surface of the silicon wafer.
- ozone water ozone concentration of 5-8 ppm, liquid temperature: 23-26°C
- ozone concentration of 5-8 ppm, liquid temperature: 23-26°C ozone concentration of 5-8 ppm, liquid temperature: 23-26°C
- the silicon wafer was transferred to a vessel containing a warm water having a temperature of 60-90°C and immersed in the warm water for 270 seconds.
- the silicon wafer was dried with hot air having a temperature of 70-90°C. Subsequently, the silicon wafer was subjected to RCA washing and an annealing treatment at 1150°C for 14 hours in an oxidizing furnace. Then, a surface of the silicon wafer was evaluated for a micro etched-nonuniformity. The results are shown in Tables 1 and 2.
- a micro etched-nonuniformity can be controlled to be 0.3% or less.
- a silicon wafer was transferred to a washing-reforming vessel after an etching treatment and subjected to washing- reforming with applying ultrasonic waves of 26 kHz and 300 W for 4 minutes .
- a potassium hydroxide solution liquid temperature: 45°C
- 0.01 wt% containing as a surface-active agent polyoxyalkylphenylether 0.01 wt% containing as a surface-active agent polyoxyalkylphenylether (0.001 wt%) was used.
- the silicon wafer was transferred to a rinse vessel containing a super deionized water and rinsed with applying ultrasonic waves of 26 kHz and 300 W for 4 minutes with the super deionized water (room temperature) overflowing the rinse vessel.
- the silicon wafer was immersed in a solution for forming an oxidized film so as to uniformly form an oxidized film on a surface of a silicon wafer.
- the silicon wafer was transferred to a vessel containing a warm water having a temperature of 60-90°C and immersed in the warm water for 270 seconds.
- the silicon wafer was dried with a hot air having a temperature of 70- 90°C.
- the silicon wafer was subjected to RCA washing and an annealing treatment at 1150 °C for 14 hours in an oxidizing furnace. Then, a surface of the silicon wafer was evaluated for a stain.
- a stain could be avoided by immersing a silicon wafer for 5 minutes even when an ozone concentration is about 2 ppm (Example 18) .
- a silicon wafer is subjected to an etching treatment and a subsequent washing-reforming treatment with a washing- reforming solution, and then an oxidized film is formed on a surface of the silicon wafer with an oxidized film forming solution, thereby enabling to contribute to a removal of contaminants of a silicon wafer, an improvement of a surface reforming and a unification and simplification of a process after an etching treatment to any kind of silicon wafer.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020007000357A KR20010021793A (en) | 1997-07-22 | 1998-07-21 | Method for washing silicon wafer |
EP98937071A EP0998751A1 (en) | 1997-07-22 | 1998-07-21 | Method for washing silicon wafer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9195959A JPH1140527A (en) | 1997-07-22 | 1997-07-22 | Method for washing silicon wafer |
JP9/195959 | 1997-07-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999005704A1 true WO1999005704A1 (en) | 1999-02-04 |
Family
ID=16349837
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/015358 WO1999005704A1 (en) | 1997-07-22 | 1998-07-21 | Method for washing silicon wafer |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0998751A1 (en) |
JP (1) | JPH1140527A (en) |
KR (1) | KR20010021793A (en) |
CN (1) | CN1265223A (en) |
WO (1) | WO1999005704A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4495572B2 (en) * | 2004-11-15 | 2010-07-07 | シャープ株式会社 | Stain film removal method |
CN108746042B (en) * | 2018-03-26 | 2020-09-01 | 江苏金晖光伏有限公司 | Cleaning method for single and polycrystalline silicon wafers cut by diamond wire saw |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0587889A1 (en) * | 1991-05-31 | 1994-03-23 | OHMI, Tadahiro | Method for cleaning and apparatus thereof |
JPH08264498A (en) * | 1995-03-27 | 1996-10-11 | Pure Retsukusu:Kk | Silicon wafer cleaning method |
JPH097990A (en) * | 1995-06-21 | 1997-01-10 | Sanyo Electric Co Ltd | Semiconductor wafer washing method |
-
1997
- 1997-07-22 JP JP9195959A patent/JPH1140527A/en not_active Withdrawn
-
1998
- 1998-07-21 KR KR1020007000357A patent/KR20010021793A/en not_active Application Discontinuation
- 1998-07-21 WO PCT/US1998/015358 patent/WO1999005704A1/en not_active Application Discontinuation
- 1998-07-21 CN CN98807500A patent/CN1265223A/en active Pending
- 1998-07-21 EP EP98937071A patent/EP0998751A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0587889A1 (en) * | 1991-05-31 | 1994-03-23 | OHMI, Tadahiro | Method for cleaning and apparatus thereof |
JPH08264498A (en) * | 1995-03-27 | 1996-10-11 | Pure Retsukusu:Kk | Silicon wafer cleaning method |
JPH097990A (en) * | 1995-06-21 | 1997-01-10 | Sanyo Electric Co Ltd | Semiconductor wafer washing method |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 097, no. 002 28 February 1997 (1997-02-28) * |
PATENT ABSTRACTS OF JAPAN vol. 097, no. 005 30 May 1997 (1997-05-30) * |
Also Published As
Publication number | Publication date |
---|---|
KR20010021793A (en) | 2001-03-15 |
EP0998751A1 (en) | 2000-05-10 |
CN1265223A (en) | 2000-08-30 |
JPH1140527A (en) | 1999-02-12 |
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