WO2018104992A1 - Ge、SiGeまたはゲルマニドの洗浄方法 - Google Patents
Ge、SiGeまたはゲルマニドの洗浄方法 Download PDFInfo
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- WO2018104992A1 WO2018104992A1 PCT/JP2016/086014 JP2016086014W WO2018104992A1 WO 2018104992 A1 WO2018104992 A1 WO 2018104992A1 JP 2016086014 W JP2016086014 W JP 2016086014W WO 2018104992 A1 WO2018104992 A1 WO 2018104992A1
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- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/28—Acidic compositions for etching iron group metals
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- H—ELECTRICITY
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P52/00—Grinding, lapping or polishing of wafers, substrates or parts of devices
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- 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
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- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/30—Acidic compositions for etching other metallic material
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- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/44—Compositions for etching metallic material from a metallic material substrate of different composition
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- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/34—Deposited materials, e.g. layers
- H10P14/3402—Deposited materials, e.g. layers characterised by the chemical composition
- H10P14/3404—Deposited materials, e.g. layers characterised by the chemical composition being Group IVA materials
- H10P14/3411—Silicon, silicon germanium or germanium
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- H—ELECTRICITY
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/60—Formation of materials, e.g. in the shape of layers or pillars of insulating materials
- H10P14/65—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by treatments performed before or after the formation of the materials
- H10P14/6516—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by treatments performed before or after the formation of the materials of treatments performed after formation of the materials
- H10P14/6534—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by treatments performed before or after the formation of the materials of treatments performed after formation of the materials by exposure to a liquid
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- H—ELECTRICITY
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P50/00—Etching of wafers, substrates or parts of devices
- H10P50/20—Dry etching; Plasma etching; Reactive-ion etching
- H10P50/28—Dry etching; Plasma etching; Reactive-ion etching of insulating materials
- H10P50/286—Dry etching; Plasma etching; Reactive-ion etching of insulating materials of organic materials
- H10P50/287—Dry etching; Plasma etching; Reactive-ion etching of insulating materials of organic materials by chemical means
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- H—ELECTRICITY
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P50/00—Etching of wafers, substrates or parts of devices
- H10P50/60—Wet etching
- H10P50/66—Wet etching of conductive or resistive materials
- H10P50/663—Wet etching of conductive or resistive materials by chemical means only
- H10P50/667—Wet etching of conductive or resistive materials by chemical means only by liquid etching only
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P70/00—Cleaning of wafers, substrates or parts of devices
- H10P70/10—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H10P70/15—Cleaning before device manufacture, i.e. Begin-Of-Line process by wet cleaning only
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- H—ELECTRICITY
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P70/00—Cleaning of wafers, substrates or parts of devices
- H10P70/20—Cleaning during device manufacture
- H10P70/23—Cleaning during device manufacture during, before or after processing of insulating materials
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- H—ELECTRICITY
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P70/00—Cleaning of wafers, substrates or parts of devices
- H10P70/20—Cleaning during device manufacture
- H10P70/27—Cleaning during device manufacture during, before or after processing of conductive materials, e.g. polysilicon or amorphous silicon layers
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- H—ELECTRICITY
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/04—Apparatus for manufacture or treatment
- H10P72/0402—Apparatus for fluid treatment
- H10P72/0406—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like
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- H—ELECTRICITY
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/06—Apparatus for monitoring, sorting, marking, testing or measuring
- H10P72/0602—Temperature monitoring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a cleaning method for cleaning and removing resists and metal residues on the surface of Ge, SiGe or germanide in a semiconductor device manufacturing process. Specifically, the present invention relates to a cleaning method for efficiently cleaning and removing resists and metal residues on the surface of Ge, SiGe, or germanium without dissolving Ge, SiGe, or germanium.
- the channel material is changing from Si to Ge, SiGe, silicide, or germanide to improve channel mobility.
- the device manufacturing process using Ge, SiGe, or germanide includes a cleaning process for removing a resist or metal residue from the Ge layer, SiGe layer, or germanide as in the conventional Si semiconductor manufacturing process.
- SPM mixed solution of sulfuric acid and hydrogen peroxide
- the Ge layer, SiGe layer or germanide is cleaned using SPM, the Ge, SiGe or germanide is dissolved, and the electrical characteristics of the device are deteriorated.
- the present invention provides a Ge, SiGe, or germanide cleaning process capable of efficiently cleaning and removing resist and metal residues without dissolving Ge, SiGe, or germanide in a Ge, SiGe, or germanide cleaning process when manufacturing a semiconductor device. It aims to provide a method.
- the gist of the present invention is as follows.
- a cleaning method for removing resist and / or metal residues on Ge, SiGe, or germanide by cleaning wherein a sulfuric acid concentration of 90% by weight or more and an oxidizing agent concentration of 200 g / L or less is used as a cleaning solution.
- [2] A method for cleaning Ge, SiGe or germanide according to [1], wherein the cleaning solution is an electrolytic solution obtained by electrolyzing a sulfuric acid solution.
- [3] A method for cleaning Ge, SiGe or germanide according to [1], wherein the cleaning liquid is a solution obtained by mixing hydrogen peroxide with a sulfuric acid solution.
- the resist and metal residues on Ge, SiGe, or germanium can be efficiently cleaned and removed without dissolving Ge, SiGe, or germanium.
- the inventors of the present invention have studied factors that cause Ge, SiGe, and germanide to dissolve in the SPM conventionally used for cleaning silicon wafers. As a result, it has been found that when cleaning is performed using an acidic solution containing an oxidant and moisture as the cleaning liquid, the water in the cleaning liquid has a great influence on the dissolution of Ge, SiGe, or germanide.
- SPM contains a considerable amount of water because sulfuric acid and hydrogen peroxide solution (hydrogen peroxide concentration: 30% by weight) are mixed at a ratio of 3: 1 to 5: 1 (volume ratio).
- the liquid temperature of the SPM after mixing becomes a high temperature of 100 ° C. or more due to an exothermic reaction due to mixing, Ge, SiGe or germanide is vigorously dissolved.
- An oxidizing agent is necessary to remove the resist or metal residue on Ge, SiGe or germanide.
- SPM in order to prevent dissolution of Ge, SiGe or germanide, it is essential to reduce the water content in the cleaning liquid containing the oxidizing agent as much as possible without reducing the oxidizing agent concentration.
- the present inventor has examined a novel method for cleaning Ge, SiGe, or germanide with an acidic cleaning solution that does not dissolve Ge, SiGe, or germanide.
- a sulfuric acid solution having a sulfuric acid concentration of 90% by weight or more and an oxidant concentration of 200 g / L or less is used, and preferably washed at a processing temperature of 50 ° C. or less, thereby sufficiently suppressing dissolution of Ge, SiGe, or germanide.
- the resist and metal residues can be highly cleaned and removed.
- Ge, SiGe, or germanide to be cleaned specifically forms an insulating film, an electrode film, or the like on a Ge or SiGe film formed on a silicon wafer in a semiconductor device manufacturing process. Therefore, the resist film and the metal residue after the formation of the germanide are attached, and the wafer is the wafer on which the Ge or SiGe film or the germanide layer is exposed. For the next film-forming process, it is necessary to reliably remove the resist and metal residues on the wafer, while suppressing the dissolution of Ge, SiGe or germanide as much as possible.
- SiGe a SiGe alloy of about Si 1-x Ge x (0.5 ⁇ x ⁇ 1) is preferable.
- a sulfuric acid solution having a sulfuric acid concentration of 90% by weight or more and an oxidant concentration of 200 g / L or less is used as a washing liquid.
- the sulfuric acid concentration of the sulfuric acid solution used as the cleaning liquid is preferably 90% by weight or more, particularly 96% by weight or more, and the water concentration is 10% by weight or less, particularly 4% by weight or less.
- the upper limit of the sulfuric acid concentration of the sulfuric acid solution is usually 98% by weight.
- the sulfuric acid solution has a high sulfuric acid concentration and a low water concentration, dissolution of Ge, SiGe or germanide at the time of washing can be suppressed.
- the reason for setting the oxidant concentration of the cleaning liquid to 200 g / L or less is as follows.
- An oxidizing agent is a component necessary for removing resist and metal residues.
- a sulfuric acid solution having a sulfuric acid concentration of 90% by weight or more is used in order to suppress dissolution of Ge, SiGe, or germanide.
- the high-concentration sulfuric acid solution has poor electrolysis efficiency. Therefore, in a general electrolyzer, the oxidant concentration is more than 200 g / L. It is difficult to make it high.
- a suitable oxidizing agent concentration in this case is 5 g / L or less.
- the upper limit of the solubility of ozone gas in the sulfuric acid solution is usually about 0.2 g / L, and adjusting a sulfuric acid solution with an oxidant concentration exceeding 5 g / L is not possible. Have difficulty.
- the sulfuric acid concentration in a general SPM is 90% by weight or less, so to prepare an SPM having a sulfuric acid concentration of 90% by weight or more. It is necessary to sufficiently control the mixing ratio.
- the cleaning liquid ESA or SOM described later, which can contain an oxidizing agent while maintaining a high sulfuric acid concentration, is preferable as compared with a conventional SPM having a mixing ratio of 3: 1 to 5: 1.
- the oxidizing agent concentration of the sulfuric acid solution as the cleaning solution is too low, the removal efficiency of the resist and metal residues is poor.
- the oxidant concentration for completely removing the resist and metal residues is 2 g / L or more as shown in Experimental Example 4 described later.
- the water concentration of a sulfuric acid solution having a sulfuric acid concentration of 98% by weight and an oxidant concentration of 5 g / L used in an experimental example described later is about 2% by weight.
- the sulfuric acid solution used as the cleaning liquid in the present invention is not particularly limited as long as it satisfies the above oxidizing agent concentration and sulfuric acid concentration.
- Specific examples of the sulfuric acid solution used in the present invention include the following. (1) An electrolytic solution obtained by electrolyzing a sulfuric acid solution (hereinafter sometimes referred to as “ESA”) (2) SPM, which is a solution in which hydrogen peroxide is mixed with sulfuric acid solution (3) A solution in which ozone gas is dissolved in a sulfuric acid solution (hereinafter sometimes referred to as “SOM”).
- ESA is obtained by electrolyzing a sulfuric acid solution to generate peroxodisulfuric acid (H 2 S 2 O 8 ), which is persulfuric acid, as an oxidizing agent.
- peroxodisulfuric acid strips and removes resist and metal residues with high oxidizing power.
- the oxidant concentration of ESA can be easily controlled by adjusting the electrolysis conditions.
- ESA as a cleaning solution, a sulfuric acid solution in which the concentration of persulfuric acid has decreased due to the self-decomposition of peroxodisulfate ions in the solution is preferably regenerated by electrolysis and recycled.
- the sulfuric acid solution having a reduced persulfuric acid concentration is sent from the cleaning device to the electrolysis device through a circulation line.
- an anode and a cathode are brought into contact with a sulfuric acid solution, and an electric current is passed between the electrodes to perform electrolysis to oxidize sulfate ions or hydrogen sulfate ions to generate peroxodisulfate ions.
- the regenerated persulfuric acid-containing sulfuric acid solution is returned to the washing apparatus through the circulation line and reused for washing.
- the peroxodisulfate ion composition of the persulfuric acid-containing sulfuric acid solution used for peeling cleaning is efficiently maintained in a state suitable for cleaning. Cleansing can be continued.
- SPM is prepared by mixing hydrogen peroxide with a sulfuric acid solution.
- Hydrogen peroxide is usually 2 to 50% by weight, generally 30% by weight as a hydrogen peroxide solution having a hydrogen peroxide concentration.
- the SPM conventionally used for cleaning a silicon wafer is a mixture of sulfuric acid and 30 wt% hydrogen peroxide water in a ratio (volume ratio) of 3: 1 to 5: 1. It is difficult to obtain a predetermined oxidant concentration at a weight percent or more.
- an SPM with a mixing ratio of sulfuric acid and 30 wt% hydrogen peroxide water of 10: 1 or more (volume ratio) and a sulfuric acid mixing ratio is increased, so that the sulfuric acid concentration is high and the water concentration is low.
- an SPM containing a predetermined concentration of oxidizing agent is provided.
- SOM is prepared by blowing ozone gas into sulfuric acid.
- ozone gas is blown into a sulfuric acid solution having a concentration of 90% by weight or more, the dissolved concentration of ozone gas is usually 0.2 g / L or less, and it is difficult to prepare a higher concentration ozone gas-containing sulfuric acid solution.
- SPM or ESA as the cleaning liquid from the viewpoint of the removal efficiency of the resist and metal residues.
- ESA is industrially advantageous because, as described above, it is possible to perform cleaning while maintaining a desired oxidant (peroxodisulfate ion) concentration by circulating an electrolytic device and a cleaning device.
- the treatment temperature is preferably 50 ° C. or lower.
- the treatment temperature during washing is preferably as low as possible within the range where the resist or metal residue can be removed by washing, and is preferably set in the range of 30 to 50 ° C.
- the cleaning time is also preferably set as short as possible so that the resist and metal residues can be removed from the viewpoint of suppressing dissolution of Ge, SiGe, or germanide.
- the washing time varies depending on the sulfuric acid concentration of the sulfuric acid solution used as the washing liquid and the treatment temperature, but is preferably within 2 minutes, particularly within 1 minute, for example, 30 seconds to 1 minute.
- Example conditions The following three types of wafers were used. (1) 20 nm NiPtGe / 300 mmSi with 50 nm NiPt residue (Pt content: 5 wt%) (2) Epitaxial 80nmGe / 300mmSi (3) Epitaxial 80nmGe / 300mmSi with resist
- the sample (1) has a 20 nm thick NiPtGe film (Pt content 5% by weight) on a 300 mm diameter Si wafer, and a 50 nm thick NiPt residue is adhered thereto.
- the sample (2) is obtained by forming an epitaxial Ge film having a thickness of 80 nm on the surface of a Si wafer having a diameter of 300 mm.
- the sample (3) is obtained by further attaching a resist to the sample (2).
- ICP-MS Analyzes Ge, SiGe, and metal concentration in the test solution.
- Microscope Analyzes the resist removal rate on Ge.
- ⁇ Test flow> Each 300 mm wafer is cut into 25 mm square test pieces. The cut specimen is immersed in the test solution for a predetermined time. After immersion, the test solution is analyzed by ICP-MS or the like, and the NiPt residue removal rate or Ge dissolution rate is calculated from the eluted metal concentration. Alternatively, the degree of resist removal on the test piece is examined by microscopic observation.
- Test conditions (1) Test solution: sulfuric acid (sulfuric acid aqueous solution), ESA, SPM, SOM (2) Sulfuric acid concentration: 30 to 98% by weight (3) Oxidant concentration: 5 g / L (in ESA and SPM) 0.2g / L (in SOM) 0g / L (in sulfuric acid) (4) Processing temperature: 30 ° C (5) Immersion time: 30 seconds (6) Wafer used: Epitaxial 80 nm Ge / 300 mm Si
- the Ge dissolution rate is 1 nm / min or less.
- the Ge dissolution rate is inversely proportional to the sulfuric acid concentration in the test solution (the Ge dissolution rate is proportional to the amount of water in the test solution).
- the sulfuric acid concentration in the test solution needs to be 90% by weight or more.
- ESA is the most desirable cleaning solution in controlling the dissolution amount of Ge, SiGe or germanide.
- Test conditions (1) Test solution: ESA, SPM (2) Sulfuric acid concentration: 85-98% by weight (3) Oxidant concentration: 5 g / L (in ESA) 3 to 350 g / L (in SPM) (4) Processing temperature: 30 ° C (5) Immersion time: 60 seconds (6) Wafer used: Epitaxial 80 nm Ge / 300 mm Si
- the Ge dissolution rate exceeds 1 nm / min, which is inappropriate from the viewpoint of high integration of semiconductors.
- the oxidant concentration is preferably 200 g / L or less.
- Test conditions (1) Test solution: sulfuric acid (sulfuric acid aqueous solution), ESA, SPM, SOM (2) Sulfuric acid concentration: 30 to 98% by weight (3) Oxidant concentration: 5 g / L (in ESA and SPM) 0.2g / L (in SOM) 0g / L (in sulfuric acid) (4) Processing temperature: 30 ° C. (when removing NiPt residue) 50 ° C (for resist removal) (5) Immersion time: 30 seconds (6) Wafer used: 20 nm NiPtGe / with 50 nm NiPt residue 300mmSi (Pt content: 5% by weight) Epitaxial 80nmGe / with resist 300mmSi
- the resist and NiPt residue could not be removed with sulfuric acid alone, and an oxidizing agent was required to remove the resist and NiPt residue.
- the resist could be removed by ESA or SPM having a sulfuric acid concentration of 75% by weight or more.
- NiPt residue could be removed by ESA or SPM regardless of the sulfuric acid concentration.
- the SOM cannot sufficiently remove the resist and the NiPt residue.
- Test conditions (1) Test solution: ESA (2) Sulfuric acid concentration: 96% by weight (3) Oxidant concentration: 0 to 5 g / L (4) Processing temperature: 30 ° C. (when removing NiPt residue) 50 ° C (for resist removal) (5) Immersion time: 30 seconds (6) Wafer used: 20nm NiPtGe / with 50nm NiPt residue 300mmSi (Pt content: 5% by weight) Epitaxial 80nmGe / with resist 300mmSi
- FIG. 5 shows the following.
- the removal rate of resist or NiPt residue is proportional to the oxidant concentration.
- a test solution having an oxidant concentration of 2 g / L or more is required.
- ESA or SPM having a sulfuric acid concentration of 90% by weight or more should be used to prevent dissolution of Ge, SiGe, or germanide.
- the oxidant concentration should be about 5 g / L at maximum. Therefore, a suitable oxidant concentration is 5 g / L or less.
- ESA or SPM having a sulfuric acid concentration of 90% by weight or more and an oxidizing agent concentration of 5 g / L or less is optimal for removing the resist or NiPt residue on Ge, SiGe, or germanide.
- Test conditions (1) Test solution: ESA (2) Sulfuric acid concentration: 98% by weight (3) Oxidant concentration: 2 g / L (4) Treatment temperature: 30, 40, 50, 60 ° C (5) Immersion time: 15, 30, 60 seconds (6) Wafer used: Epitaxial 80 nm Ge / 300 mm Si
- the treatment temperature clearly affects the Ge dissolution rate.
- the Ge dissolution rate became 1 nm / min or less.
- the Ge dissolution rate was more than 1 nm / min. Therefore, it can be seen that the treatment temperature is preferably 50 ° C. or less.
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Abstract
Description
本発明は、以下を要旨とする。
(1) 硫酸溶液を電気分解した電解液(以下「ESA」と称す場合がある。)
(2) 硫酸溶液に過酸化水素を混合した溶液であるSPM
(3) 硫酸溶液にオゾンガスを溶解させた溶液(以下「SOM」と称す場合がある。)
ESAを洗浄液として用いることにより、液中のペルオキソ二硫酸イオンの自己分解で過硫酸濃度が低下した硫酸溶液は、電気分解で再生して循環使用することが好ましい。この場合、過硫酸濃度が低下した硫酸溶液を洗浄装置から循環ラインを通して電解装置に送液する。電解装置では、硫酸溶液に陽極及び陰極を接触させ、電極間に電流を流して電気分解することによって硫酸イオン又は硫酸水素イオンを酸化してペルオキソ二硫酸イオンを生成させ、過硫酸濃度を所望の濃度とした硫酸溶液を再生する。再生した過硫酸含有硫酸溶液を、循環ラインを通して洗浄装置に返送して洗浄に再使用する。
試験目的に合わせ、以下の項目を決定する。
(1) 硫酸濃度
(2) 酸化剤濃度
(3) 処理温度
(4) 処理時間
以下3種類のウェハを使用した。
(1) 50nmNiPt残渣付き 20nmNiPtGe/300mmSi(Pt含有率:5重量%)
(2) エピタキシャル80nmGe/300mmSi
(3) レジスト付き エピタキシャル80nmGe/300mmSi
(1) ICP-MS:試験液中のGe、SiGe、金属濃度を分析する。
(2) 顕微鏡:Ge上のレジスト除去率を分析する。
それぞれの300mmウェハを25mm角の試験片にカットする。カットした試験片を所定時間、試験液に浸漬する。浸漬後、試験液をICP-MSなどで分析し、溶出金属濃度からNiPt残渣除去率又はGe溶解速度を算出する。或いは、顕微鏡観察により、試験片上のレジスト除去の程度を調べる。
試験液の硫酸濃度の差異によるGe溶解性を試験した。
(1) 試験液:硫酸(硫酸水溶液)、ESA、SPM、SOM
(2) 硫酸濃度:30~98重量%
(3) 酸化剤濃度:5g/L(ESA、SPM中)
0.2g/L(SOM中)
0g/L(硫酸中)
(4) 処理温度:30℃
(5) 浸漬時間:30秒
(6) 使用ウェハ:エピタキシャル80nmGe/300mmSi
図1より、以下のことが分かる。
試験液の酸化剤濃度の差異によるGe溶解性を試験した。
(1) 試験液:ESA、SPM
(2) 硫酸濃度:85~98重量%
(3) 酸化剤濃度:5g/L(ESA中)
3~350g/L(SPM中)
(4) 処理温度:30℃
(5) 浸漬時間:60秒
(6) 使用ウェハ:エピタキシャル80nmGe/300mmSi
図2より、以下のことが分かる。
試験液の硫酸濃度の差異によるNiPt残渣又はレジストの除去性を試験した。
(1) 試験液:硫酸(硫酸水溶液)、ESA、SPM、SOM
(2) 硫酸濃度:30~98重量%
(3) 酸化剤濃度:5g/L(ESA、SPM中)
0.2g/L(SOM中)
0g/L(硫酸中)
(4) 処理温度:30℃(NiPt残渣除去の場合)
50℃(レジスト除去の場合)
(5) 浸漬時間:30秒
(6) 使用ウェハ:
50nmNiPt残渣付き20nmNiPtGe/
300mmSi(Pt含有率:5重量%)
レジスト付き エピタキシャル80nmGe/
300mmSi
顕微鏡(レジスト除去率を分析)
図3及び図4より、以下のことが分かる。
ESA中の酸化剤濃度の差異によるレジスト又はNiPt残渣の除去性を試験した。
(1) 試験液:ESA
(2) 硫酸濃度:96重量%
(3) 酸化剤濃度:0~5g/L
(4) 処理温度:30℃(NiPt残渣除去の場合)
50℃(レジスト除去の場合)
(5) 浸漬時間:30秒
(6) 使用ウェハ:
50nmNiPt残渣付き 20nmNiPtGe/
300mmSi(Pt含有率:5重量%)
レジスト付き エピタキシャル80nmGe/
300mmSi
顕微鏡(レジスト除去率を分析)
図5より、以下のことが分かる。
処理温度の差異によるGe溶解性を試験した。
(1) 試験液:ESA
(2) 硫酸濃度:98重量%
(3) 酸化剤濃度:2g/L
(4) 処理温度:30、40、50、60℃
(5) 浸漬時間:15、30、60秒
(6) 使用ウェハ:エピタキシャル80nmGe/300mmSi
処理温度はGe溶解速度に明確に影響しており、50℃で処理した場合、Ge溶解速度が1nm/min以下となった。60℃で処理した場合はGe溶解速度は1nm/min超であった。よって、処理温度は50℃以下が好ましいことが分かる。
本出願は、2015年6月11日付で出願された日本特許出願2015-118463に基づいており、その全体が引用により援用される。
Claims (5)
- Ge、SiGeまたはゲルマニド上のレジスト及び/又は金属残渣を洗浄により除去するための洗浄方法であって、
洗浄液として、硫酸濃度が90重量%以上かつ酸化剤濃度が200g/L以下の硫酸溶液を用いることを特徴とするGe、SiGeまたはゲルマニドの洗浄方法。 - 請求項1において、前記洗浄液が硫酸溶液を電気分解して得られた電解液であることを特徴とするGe、SiGeまたはゲルマニドの洗浄方法。
- 請求項1において、前記洗浄液が硫酸溶液に過酸化水素を混合した溶液であることを特徴とするGe、SiGeまたはゲルマニドの洗浄方法。
- 請求項1において、前記洗浄液が硫酸溶液にオゾンガスを溶解させた溶液であることを特徴とするGe、SiGeまたはゲルマニドの洗浄方法。
- 請求項1ないし4のいずれか1項において、前記洗浄時の処理温度が50℃以下であることを特徴とするGe、SiGeまたはゲルマニドの洗浄方法。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020197010736A KR102654429B1 (ko) | 2016-12-05 | 2016-12-05 | Ge, SiGe 또는 저마나이드의 세정 방법 |
| US16/347,458 US20190256986A1 (en) | 2016-12-05 | 2016-12-05 | Ge, sige or germanide washing method |
| CN201680090904.5A CN110249411B (zh) | 2016-12-05 | 2016-12-05 | Ge、SiGe或锗化物的洗涤方法 |
| PCT/JP2016/086014 WO2018104992A1 (ja) | 2016-12-05 | 2016-12-05 | Ge、SiGeまたはゲルマニドの洗浄方法 |
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/JP2016/086014 WO2018104992A1 (ja) | 2016-12-05 | 2016-12-05 | Ge、SiGeまたはゲルマニドの洗浄方法 |
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| US (1) | US20190256986A1 (ja) |
| KR (1) | KR102654429B1 (ja) |
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| JP2005244179A (ja) * | 2003-12-31 | 2005-09-08 | Commissariat A L'energie Atomique | 材料表面の湿式洗浄方法及びこれを用いた電子、光学、または光電子デバイスの作製プロセス |
| JP2012094703A (ja) * | 2010-10-27 | 2012-05-17 | Fujifilm Corp | 多剤型半導体基板用洗浄剤、それを用いた洗浄方法及び半導体素子の製造方法 |
| JP2013045961A (ja) * | 2011-08-25 | 2013-03-04 | Dainippon Screen Mfg Co Ltd | 基板洗浄方法、基板洗浄液および基板処理装置 |
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| JP3572268B2 (ja) * | 2001-04-03 | 2004-09-29 | 三菱重工業株式会社 | 半導体装置の作製方法 |
| US7078160B2 (en) * | 2003-06-26 | 2006-07-18 | Intel Corporation | Selective surface exposure, cleans, and conditioning of the germanium film in a Ge photodetector |
| KR101232249B1 (ko) * | 2004-08-10 | 2013-02-12 | 간또 가가꾸 가부시끼가이샤 | 반도체 기판 세정액 및 반도체 기판 세정방법 |
| JP2012146690A (ja) * | 2009-03-31 | 2012-08-02 | Kurita Water Ind Ltd | 電子材料洗浄方法及び電子材料洗浄装置 |
| EP2733724B1 (en) * | 2011-07-11 | 2017-05-24 | Kurita Water Industries Ltd. | Method for cleaning metal gate semiconductor |
| JP5998512B2 (ja) | 2012-02-16 | 2016-09-28 | ローム株式会社 | 半導体装置および半導体装置の製造方法 |
| JP2014241386A (ja) | 2013-06-12 | 2014-12-25 | 富士通セミコンダクター株式会社 | 半導体装置の製造方法及び半導体装置 |
| CN106024632B (zh) * | 2016-05-24 | 2019-02-12 | 西安电子科技大学 | 带隙改性Ge PMOS器件及其制备方法 |
| CN106057645A (zh) * | 2016-06-20 | 2016-10-26 | 云南中科鑫圆晶体材料有限公司 | 锗单晶抛光片的清洗方法 |
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| JP2005244179A (ja) * | 2003-12-31 | 2005-09-08 | Commissariat A L'energie Atomique | 材料表面の湿式洗浄方法及びこれを用いた電子、光学、または光電子デバイスの作製プロセス |
| JP2012094703A (ja) * | 2010-10-27 | 2012-05-17 | Fujifilm Corp | 多剤型半導体基板用洗浄剤、それを用いた洗浄方法及び半導体素子の製造方法 |
| JP2013045961A (ja) * | 2011-08-25 | 2013-03-04 | Dainippon Screen Mfg Co Ltd | 基板洗浄方法、基板洗浄液および基板処理装置 |
| WO2014133137A1 (ja) * | 2013-03-01 | 2014-09-04 | 栗田工業株式会社 | 半導体基板洗浄システムおよび半導体基板の洗浄方法 |
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| US20190256986A1 (en) | 2019-08-22 |
| CN110249411A (zh) | 2019-09-17 |
| KR102654429B1 (ko) | 2024-04-03 |
| KR20190096937A (ko) | 2019-08-20 |
| CN110249411B (zh) | 2023-04-14 |
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