WO2015002132A1 - 不純物拡散組成物および半導体素子の製造方法 - Google Patents
不純物拡散組成物および半導体素子の製造方法 Download PDFInfo
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- WO2015002132A1 WO2015002132A1 PCT/JP2014/067343 JP2014067343W WO2015002132A1 WO 2015002132 A1 WO2015002132 A1 WO 2015002132A1 JP 2014067343 W JP2014067343 W JP 2014067343W WO 2015002132 A1 WO2015002132 A1 WO 2015002132A1
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/22—Diffusion of impurity materials, e.g. doping materials, electrode materials, into or out of a semiconductor body, or between semiconductor regions; Interactions between two or more impurities; Redistribution of impurities
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Definitions
- the present invention relates to an impurity diffusion composition for diffusing impurities in a semiconductor substrate, and a method for manufacturing a semiconductor element.
- a diffusion source is formed on the substrate and the impurities are diffused into the semiconductor substrate by thermal diffusion. It is taken.
- the diffusion source is formed by a CVD method or a solution coating method using a liquid impurity diffusion composition.
- a thermal oxide film is first formed on the surface of the semiconductor substrate, and then a resist having a predetermined pattern is laminated on the thermal oxide film by photolithography.
- the portion of the thermal oxide film that is not masked by the resist with acid or alkali is etched, and the resist is removed to form a mask made of the thermal oxide film.
- an n-type or p-type diffusion composition is applied to adhere the diffusion composition to the portion where the mask is open.
- the impurity component in the composition is thermally diffused into the semiconductor substrate at 600 to 1250 ° C. to form an n-type or p-type impurity diffusion layer.
- the conventional impurity diffusing agent has a problem of low crack resistance.
- a crack is generated in the film when the film thickness is increased by using a lower cost screen printing or the like.
- the inventors studied the technique of using the n-type impurity diffusion layer as a mask for p-type impurity diffusion after diffusing the n-type impurity using the n-type impurity diffusion layer. .
- the conventional n-type impurity diffusion layer is thin or porous, it has been found that the masking property is not sufficient with respect to other impurity diffusing agents.
- the viscosity is generally adjusted by adding a thickener, but pores are generated by the thermal decomposition of the thickener, resulting in a porous film, which not only reduces the mask properties but also the atmosphere during impurity diffusion. There was a problem of being easily affected by gas.
- the present invention has been made based on the above circumstances, has excellent printability to semiconductor substrates, impurity diffusibility, is less likely to cause cracks in the diffusion process, and influences the atmosphere during diffusion.
- An object is to provide an impurity diffusion composition which is not easily received. It is another object of the present invention to provide an impurity diffusion composition that forms a film having sufficient masking properties against other impurity diffusing agents after diffusion.
- the impurity diffusion composition of the present invention has the following constitution. That is, (A) An impurity diffusion composition comprising polysiloxane represented by the general formula (1) and (B) an impurity diffusion component.
- R 1 represents an aryl group having 6 to 15 carbon atoms, and a plurality of R 1 may be the same or different.
- R 2 is a hydroxyl group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an acyloxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an aryl group having 6 to 15 carbon atoms.
- the plurality of R 2 may be the same or different.
- R 3 and R 4 represent any one of a hydroxyl group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an acyloxy group having 1 to 6 carbon atoms, and an alkenyl group having 2 to 10 carbon atoms.
- R 3 and R 4 may be the same or different.
- n: m 95: 5 to 25:75.
- the manufacturing method of the semiconductor element of this invention has the following structures. That is, A method of manufacturing a semiconductor device, comprising: a step of printing an impurity diffusion composition on a semiconductor substrate to form an impurity diffusion layer film; and a step of diffusing impurities from the impurity diffusion layer film to form an impurity diffusion layer. .
- R 2 and R 4 represent any one of a hydroxyl group, an alkoxy group having 1 to 6 carbon atoms, and an acyloxy group having 1 to 6 carbon atoms
- R 3 represents an alkyl having 1 to 4 carbon atoms. It is preferably a group or an alkenyl group having 2 to 4 carbon atoms.
- the (A) polysiloxane preferably has a 20% thermal decomposition temperature of 550 ° C. or higher.
- the impurity diffusion composition of the present invention preferably further contains (C) a thickener in an amount of 3% by weight to 20% by weight with respect to the composition.
- the impurity diffusion composition of the present invention is preferably applied onto a substrate by printing in order to form a diffusion layer on the semiconductor substrate.
- the printing is preferably screen printing.
- the impurity diffusion composition film is an impurity diffusion composition pattern.
- the printing is preferably screen printing.
- an impurity diffusion composition that is excellent in printability to a substrate and impurity diffusibility, is less susceptible to cracking during firing and diffusion processes, and is less susceptible to the influence of the atmosphere during diffusion.
- the impurity diffusion composition of the present invention can be used as a mask material for other impurity diffusing agents.
- the impurity diffusion composition of the present invention contains (A) a polysiloxane represented by the general formula (1) and (B) an impurity diffusion component.
- A a polysiloxane represented by the general formula (1)
- B an impurity diffusion component.
- R 1 represents an aryl group having 6 to 15 carbon atoms, and a plurality of R 1 may be the same or different.
- R 2 is a hydroxyl group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an acyloxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an aryl group having 6 to 15 carbon atoms.
- the plurality of R 2 may be the same or different.
- R 3 and R 4 represent any one of a hydroxyl group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an acyloxy group having 1 to 6 carbon atoms, and an alkenyl group having 2 to 10 carbon atoms.
- R 3 and R 4 may be the same or different.
- n: m 95: 5 to 25:75.
- the polysiloxane represented by the general formula (1) is a polysiloxane in which a unit containing an aryl group having 6 to 15 carbon atoms is 25 to 95 mol% in terms of Si atom.
- the terminal group is any one of hydrogen, a hydroxyl group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an acyloxy group having 1 to 6 carbon atoms, and an alkenyl group having 2 to 10 carbon atoms.
- the number of carbons represents the total number of carbons including a group further substituted with the group.
- a butyl group substituted with a methoxy group has 5 carbon atoms.
- the polysiloxane represented by General formula (1) should just contain each structural component by the said predetermined ratio, and may be a block copolymer or a random copolymer.
- the unit containing an aryl group having 6 to 15 carbon atoms in the polysiloxane is contained in an amount of 25 mol% or more in terms of Si atoms, so that the crosslink density between the polysiloxane skeletons does not become too high and cracks are suppressed even in thick films. Is done. As a result, cracks are less likely to occur in the firing and thermal diffusion processes, so that the stability of impurity diffusion can be improved. Further, the impurity diffusion layer can be used as a mask for other impurity diffusing agents after the thermal diffusion of the impurities.
- the impurity diffusion composition of the present invention can be suitably used even if a thick film is difficult to crack. Also in a composition to which a thermal decomposition component such as a thickener is added, it is possible to fill pores generated by thermal decomposition due to the reflow effect of siloxane, and it is possible to form a dense film with few pores. it can. Therefore, it is difficult to be influenced by the atmosphere during diffusion, and a high masking property against other impurities can be obtained.
- the unit containing the aryl group in the polysiloxane is 95 mol% or less in terms of Si atoms, it is possible to eliminate the peeling residue after diffusion.
- Residues are considered to be carbides that remain after organic substances are not completely decomposed and volatilized, which not only hinders doping but also increases contact resistance with electrodes that are formed later, and reduces the efficiency of solar cells. It becomes. If the unit containing an aryl group exceeds 95 mol%, it is considered that the composition film becomes too dense before the organic component is completely decomposed and volatilized, and a residue is likely to be generated.
- the unit containing an aryl group having 6 to 15 carbon atoms in the polysiloxane contained in the impurity diffusion composition is: 35 mol% or more is more preferable, and 40 mol% or more is more preferable.
- the aryl group having 6 to 15 carbon atoms in R 1 of the general formula (1) may be either unsubstituted or substituted, and can be selected according to the characteristics of the composition.
- Specific examples of the aryl group having 6 to 15 carbon atoms include phenyl group, p-tolyl group, m-tolyl group, o-tolyl group, p-hydroxyphenyl group, p-styryl group, p-methoxyphenyl group, and naphthyl.
- a phenyl group, a p-tolyl group, and an m-tolyl group are particularly preferable.
- R 2 in the general formula (1) an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an acyloxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, and 6 to 15 carbon atoms.
- aryl groups may be either unsubstituted or substituted, and can be selected according to the characteristics of the composition.
- alkyl group having 1 to 6 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, t-butyl group, n-hexyl group, trifluoromethyl group, 3, Examples include 3,3-trifluoropropyl group, 3-methoxy-n-propyl group, glycidyl group, 3-glycidoxypropyl group, 3-aminopropyl group, 3-mercaptopropyl group, and 3-isocyanatopropyl group.
- a methyl group having 4 or less carbon atoms an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, and a t-butyl group are preferable.
- alkoxy group having 1 to 6 carbon atoms include methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group and t-butoxy group.
- alkenyl group having 2 to 10 carbon atoms include vinyl group, 1-propenyl group, 1-butenyl group, 2-methyl-1-propenyl group, 1,3-butanedienyl group, and 3-methoxy-1-propenyl. Group, 3-acryloxypropyl group, and 3-methacryloxypropyl group. From the viewpoint of residue, vinyl group having 1 to 4 carbon atoms, 1-propenyl group, 1-butenyl group, 2-methyl-1-propenyl group The group, 1,3-butanedienyl group and 3-methoxy-1-propenyl group are particularly preferred.
- acyloxy group having 1 to 6 carbon atoms include an acetoxy group, a propionyloxy group, an acryloyloxy group, and a benzoyloxy group.
- aryl group having 6 to 15 carbon atoms are the same as those in R 1 .
- the alkyl group having 1 to 6 carbon atoms, the alkoxy group having 1 to 6 carbon atoms, and the alkenyl group having 2 to 10 carbon atoms in R 3 and R 4 in the general formula (1) are both unsubstituted or substituted. It can be selected according to the characteristics of the composition. Examples of these include the same as those in R 2.
- R 2 and R 4 each represent a hydroxyl group, an alkoxy group having 1 to 6 carbon atoms, or an acyloxy group having 1 to 6 carbon atoms, and R 3 represents carbon
- An alkyl group having 1 to 4 carbon atoms or an alkenyl group having 2 to 4 carbon atoms is preferable. That is, it is preferable that all the polysiloxane constituent units are composed of trifunctional organosilanes.
- the 20% thermal decomposition temperature of the (A) polysiloxane of the present invention is preferably 550 ° C. or higher. Thereby, after the organic components other than polysiloxane are thermally decomposed and completely removed, a reflow effect by siloxane can be obtained, so that a denser film with less residue can be obtained.
- the 20% thermal decomposition temperature is a temperature at which the weight of polysiloxane is reduced by 20% due to thermal decomposition.
- the thermal decomposition temperature can be measured using a thermogravimetric measuring device (TGA) or the like.
- organosilanes used as raw materials for the unit having R 1 and R 2 of the general formula (1) include phenyltrimethoxysilane, phenyltriethoxysilane, p-hydroxyphenyltrimethoxysilane, and p-tolyltrimethoxysilane.
- phenyltrimethoxysilane, p-tolyltrimethoxysilane, and p-methoxyphenyltrimethoxysilane are particularly preferable.
- the polysiloxane represented by the general formula (1) can be obtained by hydrolyzing an organosilane compound and then subjecting the hydrolyzate to a condensation reaction in the presence of a solvent or without a solvent.
- Various conditions for the hydrolysis reaction for example, acid concentration, reaction temperature, reaction time, etc., can be appropriately set in consideration of the reaction scale, reaction vessel size, shape, etc.
- an organosilane compound It is preferable to add an acid catalyst and water over 1 to 180 minutes and then react at room temperature to 110 ° C. for 1 to 180 minutes. By performing the hydrolysis reaction under such conditions, a rapid reaction can be suppressed.
- the reaction temperature is more preferably 30 to 130 ° C.
- Acid catalysts include hydrochloric acid, hydrobromic acid, hydroiodic acid and other halogenated inorganic acids, sulfuric acid, nitric acid, phosphoric acid, hexafluorophosphoric acid, hexafluoroantimonic acid, boric acid, tetrafluoroboric acid, Other inorganic acids such as chromic acid, methanesulfonic acid, ethanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, sulfonic acid such as trifluoromethanesulfonic acid, acetic acid, citric acid, formic acid, gluconic acid, lactic acid, oxalic acid, Examples thereof include carboxylic acids such as tartaric acid, pyruvic acid, citric acid, succinic acid, fumaric acid and malic acid.
- the acid catalyst of the present invention preferably contains no atoms other than silicon, hydrogen, carbon, oxygen, nitrogen and phosphorus from the viewpoint of doping, and phosphoric acid, formic acid, acetic acid and carboxylic acid acid catalysts are used. preferable. Of these, phosphoric acid is preferred.
- the content of the acid catalyst is preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the total organosilane compound used in the hydrolysis reaction.
- the solvent used for the hydrolysis reaction of the organosilane compound and the condensation reaction of the hydrolyzate is not particularly limited, and can be appropriately selected in consideration of the stability, wettability, volatility, etc. of the resin composition. In addition, two or more solvents may be combined, or the reaction may be performed without solvent.
- the solvent include methanol, ethanol, propanol, isopropanol, butanol, isobutanol, t-butanol, 1-methoxy-2-propanol, pentanol, 4-methyl-2-pentanol, 3-methyl-2- Alcohols such as butanol, 3-methyl-3-methoxy-1-butanol, 1-t-butoxy-2-propanol and diacetone alcohol; glycols such as ethylene glycol and propylene glycol; ethylene glycol monomethyl ether, ethylene glycol mono Ethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol t-butyl ether, propylene glycol n- Cyl ether Ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethyl ether, di
- diethylene glycol methyl ethyl ether (boiling point 176 ° C.), ethylene glycol monoethyl ether acetate (boiling point 156.4 ° C.), ethylene glycol monomethyl ether acetate (boiling point 145 ° C.), methyl lactate (Boiling point 145 ° C), ethyl lactate (boiling point 155 ° C), diacetone alcohol (boiling point 169 ° C), propylene glycol monomethyl ether acetate (boiling point 145 ° C), 3-methoxy-3-methyl-1-butanol (boiling point 174 ° C) Dipropylene glycol monomethyl ether (boiling point 188 ° C), dipropylene glycol-n-butyl ether (boiling point 229 ° C), ⁇ -butyrolactone (boiling point
- a solvent When a solvent is generated by a hydrolysis reaction, it can be hydrolyzed without solvent. It is also preferable to adjust the concentration of the resin composition to an appropriate level by adding a solvent after completion of the reaction. Further, after hydrolysis according to the purpose, an appropriate amount of the produced alcohol may be distilled and removed under heating and / or reduced pressure, and then a suitable solvent may be added.
- the amount of the solvent used in the hydrolysis reaction is preferably 80 parts by weight or more and 500 parts by weight or less with respect to 100 parts by weight of the total organosilane compound. By making the quantity of a solvent into the said range, it can control easily so that a hydrolysis reaction may progress sufficiently and necessary.
- the water used for the hydrolysis reaction is preferably ion exchange water. The amount of water can be arbitrarily selected, but it is preferably used in the range of 1.0 to 4.0 mol with respect to 1 mol of Si atoms.
- the impurity diffusion component is a component for forming an impurity diffusion layer in the semiconductor substrate.
- the n-type impurity diffusion component is preferably a compound containing a Group 15 element, and more preferably a phosphorus compound.
- a compound containing an element belonging to Group 13 is preferable, and a boron compound is particularly preferable.
- Phosphorus compounds include diphosphorus pentoxide, phosphoric acid, polyphosphoric acid, methyl phosphate, dimethyl phosphate, trimethyl phosphate, ethyl phosphate, diethyl phosphate, triethyl phosphate, propyl phosphate, dipropyl phosphate, phosphoric acid Phosphoric esters such as tripropyl, butyl phosphate, dibutyl phosphate, tributyl phosphate, phenyl phosphate, diphenyl phosphate, triphenyl phosphate, methyl phosphite, dimethyl phosphite, trimethyl phosphite, Ethyl phosphate, diethyl phosphite, triethyl phosphite, propyl phosphite, dipropyl phosphite, tripropyl phosphite, butyl phosphite, dibutyl pho
- boron compounds include boric acid, diboron trioxide, methyl boronic acid, phenyl boronic acid, trimethyl borate, triethyl borate, tripropyl borate, tributyl borate, trioctyl borate, triphenyl borate and the like. it can.
- the SiO 2 equivalent mass of the Si component is a value obtained by converting the content of the Si component in the composition into the mass of SiO 2 .
- the converted mass ratio is more preferably in the range of 95: 5 to 40:60, and most preferably in the range of 90:10 to 50:50. This mass ratio can be calculated by inorganic analysis such as ICP emission analysis or fluorescent X-ray analysis.
- the impurity diffusion composition of the present invention preferably contains a solvent.
- a solvent can be used without a restriction
- the content of the solvent having a boiling point of 100 ° C. or higher is preferably 20% by weight or more based on the total amount of the solvent.
- Solvents having a boiling point of 100 ° C. or higher include diethylene glycol methyl ethyl ether (boiling point 176 ° C.), ethylene glycol monoethyl ether acetate (boiling point 156.4 ° C.), ethylene glycol monomethyl ether acetate (boiling point 145 ° C.), methyl lactate (boiling point 145 ° C.
- the solvent having a boiling point of less than 100 ° C. include alcohols such as methanol, ethanol, propanol, isopropanol, and t-butanol; ethers such as diethyl ether and diisopropyl ether; ketones such as methyl ethyl ketone; isopropyl acetate, ethyl Examples thereof include acetates such as acetate, propyl acetate, n-propyl acetate, and 3-methyl-3-methoxybutyl acetate; aliphatic hydrocarbons such as hexane and cyclohexane.
- the impurity diffusion composition of the present invention may contain a surfactant.
- a surfactant By containing the surfactant, coating unevenness is improved and a uniform coating film is obtained.
- a fluorine-based surfactant or a silicone-based surfactant is preferably used.
- fluorosurfactant examples include 1,1,2,2-tetrafluorooctyl (1,1,2,2-tetrafluoropropyl) ether, 1,1,2,2-tetrafluorooctyl. Hexyl ether, octaethylene glycol di (1,1,2,2-tetrafluorobutyl) ether, hexaethylene glycol (1,1,2,2,3,3-hexafluoropentyl) ether, octapropylene glycol di (1 , 1,2,2-tetrafluorobutyl) ether, hexapropylene glycol di (1,1,2,2,3,3-hexafluoropentyl) ether, sodium perfluorododecyl sulfonate, 1,1,2,2 , 8,8,9,9,10,10-decafluorododecane, 1,1,2,2,3,3-hexafluorodecane, N- [3- (Perf Oloocty
- silicone surfactants include SH28PA, SH7PA, SH21PA, SH30PA, ST94PA (all manufactured by Toray Dow Corning), BYK067A, BYK310, BYK322, BYK331, BYK333, BYK355 (stock) )).
- the content of the surfactant is preferably 0.0001 to 1% by weight in the impurity diffusion composition.
- the impurity diffusion composition of the present invention preferably contains a thickener for viscosity adjustment. Thereby, it can apply
- organic thickener cellulose, cellulose derivative, starch, starch derivative, polyvinylpyrrolidone, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyurethane resin, polyurea resin, polyimide resin, polyamide resin, epoxy resin, polystyrene Resin, polyester resin, synthetic rubber, natural rubber, polyacrylic acid, various acrylic resins, polyethylene glycol, polyethylene oxide, polypropylene glycol, polypropylene oxide, silicone oil, sodium alginate, xanthan gum polysaccharide, gellan gum polysaccharide, guar gum Polysaccharides, carrageenan polysaccharides, locust bean gum polysaccharides, carboxyvinyl polymers, hydrogenated castor oil systems, hydrogenated castor oil systems and
- inorganic systems bentonite, montmorillonite, magnesia montmorillonite, tetsu montmorillonite, tectum magnesia montmorillonite, beidellite, aluminite, sapphire, aluminian saponite, laponite, aluminum silicate, aluminum silicate
- examples thereof include magnesium, organic hectorite, fine particle silicon oxide, colloidal alumina, and calcium carbonate. You may use these in combination of multiple types.
- a cellulosic thickener 1110, 1120, 1130, 1140, 1150, 1160, 1170, 1180, 1190, 2200, 2260, 2280, 2450 (all manufactured by Daicel Finechem Co., Ltd.)
- polysaccharide thickeners include Viscarin PC209, Viscarin PC389, SeaKemXP8012, (manufactured by FM Chemicals), CAM-H, GJ-182, SV-300, LS-20, LS-30, XGT, XGK. -D, G-100, LG-10 (all of which are Mitsubishi Corporation).
- acrylic thickener examples include # 2434T, KC7000, KC1700P (manufactured by Kyoeisha Chemical Co., Ltd.), AC-10LHPK, AC-10SHP, 845H, PW-120 (manufactured by Toagosei Co., Ltd.), and the like. is there.
- hydrogenated castor oil thickeners examples include Disparon 308, NMLONT-206 (manufactured by Enomoto Kasei Co., Ltd.), T-20SF, and T-75F (manufactured by Ito Oil Co., Ltd.).
- Examples of the oxidized polyethylene-based thickener include D-10A, D-120, D-120-10, D-1100, DS-525, DS-313 (above, manufactured by Ito Oil Co., Ltd.), Disparon 4200-20, Same PF-911, Same PF-930, Same 4401-25X, Same NS-30, Same NS-5010, Same NS-5025, Same NS-5810, Same NS-5210, Same NS-5310 ), Flownon SA-300, SA-300H (above, manufactured by Kyoeisha Chemical Co., Ltd.).
- T-250F, T-550F, T-850F, T-1700, T-1800, T-2000 above, manufactured by Ito Oil Co., Ltd.
- Disparon 6500, 6300, 6650 6700, 3900EF above, manufactured by Enomoto Kasei Co., Ltd.
- Bentonite-based thickeners include Bengel, Wenger HV, HVP, F, FW, Bright 11, A, W-100, W-100U, W-300U, SH, Multiben, and Sven. , Sven C, E, W, P, WX, Organite, Organite D (above, manufactured by Hojun Co., Ltd.).
- the thickener preferably has a 90% thermal decomposition temperature of 400 ° C. or less from the viewpoint of dense film formation and residue reduction.
- polyethylene glycol, polyethylene oxide, polypropylene glycol, polypropylene oxide, and various acrylic ester resins are preferable, and among them, polyethylene oxide, polypropylene oxide, or acrylic ester resins are preferable.
- an acrylic ester resin is particularly preferable.
- the 90% thermal decomposition temperature is a temperature at which the weight of the thickener is reduced by 90% by thermal decomposition.
- the thermal decomposition temperature can be measured using a thermogravimetric measuring device (TGA) or the like.
- acrylic ester resins include polymethyl methacrylate, polyethyl methacrylate, polypropyl methacrylate, polybutyl methacrylate, polymethyl acrylate, polyethyl acrylate, polypropyl acrylate, polybutyl acrylate, polyhydroxyethyl
- acrylic ester component may be 60 mol% or more as a polymerization ratio, and other copolymerizable components such as polyacrylic acid and polystyrene may be copolymerized.
- Acrylic ester resins, polyethylene oxide, and polypropylene oxide are all preferably those having a weight average molecular weight of 100,000 or more because of their high thickening effect.
- the content of these thickeners is preferably 3% by weight or more and 20% by weight or less in the impurity diffusion composition. By being in this range, a sufficient viscosity adjusting effect can be obtained, and at the same time a dense film can be formed.
- a thixotropic agent that imparts thixotropy.
- imparting thixotropy means increasing the ratio ( ⁇ 1 / ⁇ 2 ) of the viscosity at the time of low shear stress ( ⁇ 1 ) and the viscosity at the time of high shear stress ( ⁇ 2 ).
- a thixotropic agent By containing a thixotropic agent, the pattern accuracy of screen printing can be increased. The reason is as follows. Impurity diffusion compositions containing thixotropic agents are low in viscosity at high shear stress, so screen clogging is unlikely to occur during screen printing, and high viscosity at low shear stress, so that bleeding immediately after printing and pattern line width increase Is less likely to occur.
- thixotropic agents include cellulose, cellulose derivatives, sodium alginate, xanthan gum polysaccharide, gellan gum polysaccharide, guar gum polysaccharide, carrageenan polysaccharide, locust bean gum polysaccharide, carboxyvinyl polymer, hydrogenated Castor oil, hydrogenated castor oil and fatty acid amide wax, special fatty acid, polyethylene oxide, mixture of polyethylene oxide and amide, fatty acid polyvalent carboxylic acid, phosphate ester surfactant, long chain polyaminoamide Phosphate salt, specially modified polyamide, bentonite, montmorillonite, magnesia montmorillonite, tet montmorillonite, tet magnesian montmorillonite, beidellite, aluminite, sapphire, aluminian support stone, laponite, kei Acid Miniumu, magnesium aluminum silicate, organic hectorite, particulate silicon oxide, coll
- the thixotropic agent can be used alone, but it is also possible to combine two or more thixotropic agents. Moreover, it is more preferable to use in combination with the thickener, and a higher effect can be obtained.
- the viscosity of the impurity diffusion composition of this invention According to a printing method and a film thickness, it can change suitably.
- the viscosity of the diffusion composition is preferably 5,000 mPa ⁇ s or more. This is because blurring of the print pattern can be suppressed and a good pattern can be obtained.
- a more preferable viscosity is 10,000 mPa ⁇ s or more.
- the upper limit is not particularly limited, but is preferably 100,000 mPa ⁇ s or less from the viewpoint of storage stability and handleability.
- the viscosity is less than 1,000 mPa ⁇ s, it is a value measured at a rotation speed of 20 rpm using an E type digital viscometer based on JIS Z 8803 (1991) “Solution Viscosity-Measurement Method”
- 1,000 mPa ⁇ s or more it is a value measured at a rotation speed of 20 rpm using a B-type digital viscometer based on JIS Z 8803 (1991) “Solution Viscosity—Measurement Method”.
- the thixotropy can be determined from the ratio of viscosities at different rotational speeds obtained by the above viscosity measurement method.
- the ratio ( ⁇ 2 / ⁇ 20 ) of the viscosity ( ⁇ 20 ) at a rotational speed of 20 rpm and the viscosity ( ⁇ 2 ) at a rotational speed of 2 rpm is defined as thixotropy.
- the thixotropy is preferably 2 or more, and more preferably 3 or more.
- the solid content concentration of the impurity diffusion composition of the present invention is not particularly limited, but is preferably in the range of 1% by weight to 90% by weight. If it is lower than this concentration range, the coating film thickness becomes too thin and it is difficult to obtain desired doping properties and mask properties. If it is higher than this concentration range, the storage stability is lowered.
- FIG. 1 illustrates a step of forming a pattern using an impurity diffusion composition, a step of diffusing an n-type impurity from the pattern into the semiconductor substrate, and a p-type impurity being diffused into the semiconductor substrate using the pattern as a mask.
- the method of forming an impurity diffusion layer characterized by including a process.
- FIG. 2 illustrates a method for manufacturing a semiconductor device using the impurity diffusion layer, taking a method for manufacturing a back junction solar cell as an example.
- an n-type impurity diffusion composition 2 of the present invention is patterned on a semiconductor substrate 1.
- the semiconductor substrate 1 for example, a crystalline silicon substrate in which an n-type single crystal silicon having an impurity concentration of 10 15 to 10 16 atoms / cm 3 , polycrystalline silicon, and other elements such as germanium and carbon are mixed. Is mentioned. It is also possible to use p-type crystalline silicon or a semiconductor other than silicon.
- the semiconductor substrate 1 is preferably a substantially rectangular shape having a thickness of 50 to 300 ⁇ m and an outer shape of 100 to 250 mm on a side. In order to remove the slice damage and the natural oxide film, it is preferable to etch the surface with a hydrofluoric acid solution or an alkaline solution.
- a protective film may be formed on the light receiving surface of the semiconductor substrate 1.
- a known protective film such as silicon oxide or silicon nitride formed by a method such as a CVD (chemical vapor deposition) method or a spin-on-glass (SOG) method can be applied.
- Examples of the pattern forming method of the n-type impurity diffusion composition 2 include a screen printing method, an ink jet printing method, a slit coating method, a spray coating method, a letterpress printing method, and an intaglio printing method. After pattern formation by these methods, it is preferable to dry the n-type impurity diffusion composition 2 in a range of 50 to 200 ° C. for 30 seconds to 30 minutes using a hot plate, oven or the like.
- the thickness of the n-type impurity diffusion composition 2 after drying is preferably 200 nm or more, and preferably 5 ⁇ m or less from the viewpoint of crack resistance, in consideration of masking properties against p-type impurities.
- impurities in the n-type impurity diffusion composition 2 are diffused into the semiconductor substrate 1 to form an n-type impurity diffusion layer 3.
- a known thermal diffusion method can be used.
- methods such as electric heating, infrared heating, laser heating, and microwave heating can be used.
- the time and temperature of thermal diffusion can be appropriately set so that desired diffusion characteristics such as impurity diffusion concentration and diffusion depth can be obtained.
- an n-type diffusion layer having a surface impurity concentration of 10 19 to 10 21 can be formed by heat diffusion at 800 ° C. to 1200 ° C. for 1 to 120 minutes.
- the diffusion atmosphere is not particularly limited, and may be performed in the air, or the oxygen amount in the atmosphere may be appropriately controlled using an inert gas such as nitrogen or argon. From the viewpoint of shortening the diffusion time, the oxygen concentration in the atmosphere is preferably 3% or less.
- the n-type impurity diffusion composition 2 can be peeled off by peeling with a known etching solution such as hydrofluoric acid. After that, printing of the p-type impurity diffusion composition and diffusion of the p-type impurity may be performed on the semiconductor substrate after the formation of the n-type impurity diffusion layer, but as described below, the n-type impurity diffusion composition Printing of the p-type impurity diffusion composition and diffusion of the p-type impurities can be performed without peeling off the product 2, which is preferable from the viewpoint of reducing the number of steps.
- the n-type impurity diffusion composition 2 is fired as necessary, and then the p-type impurity diffusion composition is used with the n-type impurity diffusion composition 2 as a mask as shown in FIG. 4 is applied.
- the p-type impurity diffusion composition 4 may be formed on the entire surface, or may be formed only on a portion where the n-type impurity diffusion composition 2 is not present. Moreover, you may apply
- coat so that a part of p-type impurity diffusion composition 4 may overlap with the n-type impurity diffusion composition 2.
- the method exemplified in the pattern formation method of the n-type impurity diffusion composition can be used.
- the p-type impurity diffusion composition 5 is diffused into the semiconductor substrate 1 using the fired n-type impurity diffusion composition 2 as a mask layer to form a p-type impurity diffusion layer 5.
- the p-type impurity diffusion method may be the same as the n-type impurity diffusion method.
- the n-type impurity diffusion composition 2 and the p-type impurity diffusion composition 4 formed on the surface of the semiconductor substrate 1 are removed by a known etching method.
- a material used for an etching For example, what contains water, an organic solvent, etc. as an other component contains at least 1 sort (s) among hydrogen fluoride, ammonium, phosphoric acid, a sulfuric acid, and nitric acid. preferable.
- n-type and p-type impurity diffusion layers can be formed in the semiconductor substrate. By setting it as such a process, a process can be simplified compared with the conventional method.
- the application / diffusion of the p-type impurity diffusion composition is performed after the application / diffusion of the n-type impurity diffusion composition.
- the n-type impurity is applied after the application / diffusion of the p-type impurity diffusion composition. It is also possible to apply and diffuse the diffusion composition.
- a protective film 6 is formed on the entire back surface of the semiconductor substrate 1 having the n-type impurity diffusion layer 3 and the p-type impurity diffusion layer 5 formed on the back surface.
- the protective film 6 is patterned by an etching method or the like to form a protective film opening 6a.
- the n-type contact electrode 7 and the p-type contact electrode are formed by pattern-coating and baking an electrode paste on the region including the opening 6a by a stripe coating method or a screen printing method. 8 is formed. Thereby, the back junction solar cell 9 is obtained.
- FIG. 3 illustrates a step of forming a pattern using an n-type impurity diffusion composition, a step of applying a p-type impurity diffusion composition using the n-type impurity diffusion composition as a mask, the n-type impurity diffusion composition, and and a step of diffusing n-type and p-type impurities from the p-type impurity diffusion composition into the semiconductor substrate.
- the n-type impurity diffusion composition 2 of the present invention is patterned on a semiconductor substrate 1.
- the p-type impurity diffusion composition 4 is applied using the n-type impurity diffusion composition 2 as a mask.
- the n-type impurity diffusion component in the n-type impurity diffusion composition 2 and the p-type impurity diffusion component in the p-type impurity diffusion composition 4 are simultaneously mixed in the semiconductor substrate 1.
- N-type impurity diffusion layer 3 and p-type impurity diffusion layer 5 are formed. Examples of the impurity diffusion composition coating method, firing method, and diffusion method include the same methods as described above.
- the n-type impurity diffusion composition 2 and the p-type impurity diffusion composition 4 formed on the surface of the semiconductor substrate 1 are removed by a known etching method.
- n-type and p-type impurity diffusion layers can be formed in the semiconductor substrate.
- the impurity diffusion composition of the present invention is also applied to photovoltaic devices such as solar cells and semiconductor devices that pattern impurity diffusion regions on the surface of semiconductors, such as transistor arrays, diode arrays, photodiode arrays, and transducers. can do.
- GBL ⁇ -butyrolactone BC: butyl carbitol
- TERP terpineol
- PEO polyethylene oxide
- PMMA polymethyl methacrylate
- PPO polypropylene oxide
- PVP polyvinyl pyrrolidone
- PVB polyvinyl butyral EtOH: ethanol
- PhTMS phenyltrimethoxysilane
- PhTES phenyltriethoxysilane
- TolTMS P-tolyltrimethoxysilane
- MeOPhTMS p-methoxyphenyltrimethoxysilane
- MeTMS methyltrimethoxysilane EtTMS: ethyltrimethoxysilane
- PrTMS propyltrimethoxysilane BuTMS: butyltrimethoxysilane
- HexTMS hexyltrimethoxysilane
- MePhDMS methylphenyl Dimethoxysilane
- the measured value at a rotational speed of 20 rpm was defined as viscosity, and the ratio ( ⁇ 2 / ⁇ 20 ) between the measured value at a rotational speed of 20 rpm ( ⁇ 20 ) and the measured value at a rotational speed of 2 rpm ( ⁇ 2 ) was defined as thixotropy.
- a semiconductor substrate made of n-type single crystal silicon having a side of 156 mm was prepared, and both surfaces were subjected to alkali etching in order to remove slice damage and natural oxides.
- innumerable irregularities having a typical width of about 40 to 100 ⁇ m and a depth of about 3 to 4 ⁇ m were formed on both surfaces of the semiconductor substrate, and this was used as a coated substrate.
- FIG. 4 shows a schematic diagram of the stripe coating apparatus used in this example.
- the semiconductor substrate 31 vacuum-adsorbed on the stage 32 was aligned using a CCD camera 36 and the height was adjusted using a height sensor 37.
- the bracket 35 provided with the nozzle 38 applied the impurity diffusion composition by moving the nozzle 38 in the Y direction by a linear drive device (Y direction) 34 to form a line.
- the nozzle 38 was moved to the predetermined distance X direction by the linear drive device (X direction) 33, and the line was similarly formed. By repeating this, a striped pattern was formed.
- the stripe coating method is as follows. As shown in FIG. 5, the impurity diffusion composition was supplied from the paste supply port 47. The pressure was applied from the pressure port 46, and the paste 43 made of the impurity diffusion composition was discharged from the plurality of discharge ports 42 formed under the nozzle 41 through the manifold 45. The nozzle 41 was moved in the direction perpendicular to the paper surface in a state where the beads 44 were formed between the semiconductor substrate 40 and the discharge ports 42.
- the substrate After applying the stripe pattern with the impurity diffusion composition, the substrate is heated in air at 140 ° C. for 5 minutes, and further at 230 ° C. for 30 minutes, so that the pattern has a thickness of about 1.0 ⁇ m, a width of 240 ⁇ m, a pitch of 600 ⁇ m, and a length of 8 cm. Formed.
- the line width was measured for 10 points at an equal interval for any one line, and those having a standard deviation ⁇ of coating width of 15 ⁇ m or less were judged good (good), and those exceeding 15 ⁇ m were judged bad (bad). .
- a semiconductor substrate made of n-type single crystal silicon having a side of 156 mm was prepared, and both surfaces were subjected to alkali etching in order to remove slice damage and natural oxides.
- innumerable irregularities having a typical width of about 40 to 100 ⁇ m and a depth of about 3 to 4 ⁇ m were formed on both surfaces of the semiconductor substrate, and this was used as a coated substrate.
- a screen printer (Microtech TM-750 type) a screen mask with 175 openings with a width of 200 ⁇ m and a length of 13.5 cm formed at a pitch of 600 ⁇ m (SUS Co., 400 mesh) , A wire diameter of 23 ⁇ m) was used to form a stripe pattern.
- the substrate is heated in air at 140 ° C. for 5 minutes and further at 230 ° C. for 30 minutes, so that the thickness is about 1.5 ⁇ m, the width is about 210 ⁇ m, the pitch is 600 ⁇ m, and the length is 13. A 5 cm pattern was formed.
- the line width of 10 points is measured at an equal interval for any one line, and the standard deviation of the coating width is within 12.5 ⁇ m superior (A), and the one over 12.5 ⁇ m within 15 ⁇ m is excellent (B), those exceeding 15 ⁇ m and within 17.5 ⁇ m were determined as good (C), those exceeding 17.5 ⁇ m and within 20 ⁇ m were determined as fair (D), and those exceeding 20 ⁇ m were determined as bad (E).
- the impurity diffusion composition was applied to the silicon wafer by a known spin coating method. Samples were prepared by changing the number of rotations and changing the film thickness every 0.1 ⁇ m after firing. In the thin film region, those diluted with the same solvent composition as the impurity diffusion composition were appropriately used. After coating, each silicon wafer was pre-baked at 140 ° C. for 5 minutes.
- the mask property measurement method will be described by taking the mask property of the n-type impurity diffusion composition with respect to the p-type impurity diffusion composition as an example.
- About half (1.5 cm ⁇ 3 cm) of p-type impurity diffusion composition PBF (manufactured by Tokyo Ohka Kogyo Co., Ltd.) is applied on the crack-resistant film thickness observation substrate (3 cm ⁇ 3 cm) made of the n-type impurity diffusion composition.
- the silicon wafer was immersed in a 10% by weight hydrofluoric acid aqueous solution at 23 ° C. for 1 minute to remove the cured diffusing agent.
- the surface resistance of the peeled silicon wafer was measured using a four-probe surface resistance measuring device RT-70V (manufactured by Napson Corporation).
- RT-70V surface resistance measuring device
- the difference between the crack-resistant film thickness and the mask film thickness indicates a margin that can be used as a mask material, and the wider this margin, the wider the applicable range and the better.
- a material having a large film thickness margin is preferable for an uneven substrate used in the solar cell field.
- the impurity diffusive composition to be measured was applied to the silicon wafer by a known spin coating method so that the pre-baked film thickness was about 500 nm. After coating, the silicon wafer was pre-baked at 140 ° C. for 5 minutes.
- each silicon wafer was immersed in a 10% by weight hydrofluoric acid aqueous solution at 23 ° C. for 1 minute to peel off the cured diffusing agent.
- the peeled silicon wafer was subjected to p / n determination using a p / n determination machine, and the surface resistance was measured using a four-probe type surface resistance measuring device RT-70V (manufactured by Napson Corporation).
- the sheet resistance value was used.
- the sheet resistance value is an index of impurity diffusivity, and a smaller resistance value means a larger amount of impurity diffusion.
- the impurity diffusion composition is stored in a refrigerator (4 ° C.) for 4 weeks, and when the viscosity after 4 weeks is less than 3% change in viscosity with respect to the initial viscosity, excellent (excellent), 3% or more When less than 6%, good (good), when 6% or more and less than 10%, bad (impossible), when the viscosity change was 10% or more, or precipitation, cloudiness, gelation, etc. occurred, it was judged as poor.
- Example 1 Synthesis of polysiloxane solution
- KBM-13 methyltrimethoxysilane
- KBM-103 phenyltrimethoxysilane
- GBL GBL
- An aqueous solution of phosphoric acid prepared by dissolving 0.1.215 g of phosphoric acid in 130.76 g of water was added over 30 minutes while stirring at 36.03 g.
- the mixture was stirred at 40 ° C. for 1 hour, then heated to 70 ° C. and stirred for 30 minutes. Thereafter, the temperature of the oil bath was raised to 115 ° C.
- the internal temperature of the solution reached 100 ° C., and was then heated and stirred for 1 hour (the internal temperature was 100 to 110 ° C.).
- the resulting solution was cooled in an ice bath to obtain a polysiloxane solution.
- the solid content concentration of the polysiloxane solution was 39.8% by weight.
- Examples 2-8 An impurity diffusion composition was obtained by blending with the composition shown in Table 1. When the crack resistance, mask property, peelability, pattern accuracy, storage stability, and sheet resistance value were measured, all were good as shown in Table 3. In particular, when the ratio of the aryl group having 6 to 15 carbon atoms in the polysiloxane was increased, cracks were difficult to occur even with a larger film thickness, and the crack resistance was good.
- Examples 9 to 41 In Examples 9 to 41, various thickeners were added so as to have a predetermined weight% concentration with respect to the whole solution, and were dissolved using a rotation / revolution mixer ARE-310 (manufactured by Shinky Co., Ltd.) (stirring). : 15 minutes, defoaming: 1 minute). When crack resistance, impurity diffusibility, masking property, peelability, pattern accuracy, storage stability, and sheet resistance were measured, all were good as shown in Tables 3 and 4. Those in which all the structural units of polysiloxane are trifunctional organosilanes were excellent in impurity diffusibility and releasability.
- a polysiloxane having an aryl group ratio of 40 mol% or more is excellent in impurity diffusibility and masking properties, and a polysiloxane having an aryl group ratio of 80 mol% or less has particularly good peelability.
- Example 42 Method for forming n-type impurity diffusion layer and p-type impurity diffusion layer
- a screen is partially formed on a p-type silicon wafer 51 (manufactured by Ferrotech Silicon Co., Ltd., surface resistivity 410 ⁇ / ⁇ ).
- the n-type impurity diffusion composition 52 described in Example 1 was applied by a printing method. After application, the p-type silicon wafer 51 was pre-baked at 140 ° C. for 5 minutes.
- a p-type impurity diffusion composition 54 (PBF, manufactured by Tokyo Ohka Kogyo Co., Ltd.) is applied on the entire surface of the p-type silicon wafer 51 by a spin coating method. Pre-baked on hot plate for minutes. Thereafter, the p-type silicon wafer 51 is placed in an electric furnace and maintained at 900 ° C. for 60 minutes in a nitrogen atmosphere to thermally diffuse the impurities, thereby forming a p-type impurity diffusion layer 55 as shown in FIG. did.
- PPF p-type impurity diffusion composition 54
- the p-type silicon wafer 51 was immersed in a 10% by weight hydrofluoric acid aqueous solution at 23 ° C. for 1 minute to peel off the n-type impurity diffusion composition 52 and the p-type impurity diffusion composition 54.
- the surface resistance of the p-type silicon wafer 51 after peeling was measured using a four-probe type surface resistance measuring device RT-70V (manufactured by Napson Corporation).
- the sheet resistance value is 20 ⁇ / ⁇ (p / n determination is n) at the location where the n-type impurity diffusion composition 52 is applied, and 65 ⁇ / ⁇ (p / n determination is p at the location where only the p-type impurity diffusion composition 54 is applied)
- the formation of n-type and p-type impurity diffusion layers was confirmed.
- Example 43 Method for forming n-type impurity diffusion layer and p-type impurity diffusion layer
- a screen is partially formed on a p-type silicon wafer 61 (manufactured by Ferrotech Silicon Co., Ltd., surface resistivity 410 ⁇ / ⁇ ).
- the n-type impurity diffusion composition 62 described in Example 1 was applied by a printing method. After coating, the P-type silicon wafer 61 was pre-baked at 100 ° C. for 5 minutes.
- the p-type silicon wafer 61 was placed in an electric furnace, and maintained at 800 ° C. for 30 minutes in an air atmosphere, whereby the n-type impurity diffusion composition 62 was baked.
- a p-type impurity diffusion composition 64 (PBF, manufactured by Tokyo Ohka Kogyo Co., Ltd.) is applied on the entire surface of the p-type silicon wafer 61 by a spin coating method. Pre-baked on hot plate for minutes. Thereafter, the p-type silicon wafer 61 is placed in an electric furnace, and is maintained at 900 ° C. for 60 minutes in a nitrogen atmosphere to thermally diffuse the impurity diffusion component. As shown in FIG. And the p-type impurity diffusion layer 65 was formed.
- PPF p-type impurity diffusion composition 64
- the p-type silicon wafer 61 was immersed in a 10% by weight hydrofluoric acid aqueous solution at 23 ° C. for 1 minute to peel off the n-type impurity diffusion composition 62 and the p-type impurity diffusion composition 64.
- the surface resistance of the p-type silicon wafer 61 after peeling was measured using a four-probe type surface resistance measuring device RT-70V (manufactured by Napson Corporation).
- the sheet resistance value is 15 ⁇ / ⁇ (p / n determination is n) at the location where the n-type impurity diffusion composition is applied, and 60 ⁇ / ⁇ (p / n determination is p) at the location where only the p-type impurity diffusion composition 64 is applied.
- Comparative Example 1 An impurity diffusion composition was obtained by blending with the compositions shown in Tables 1 and 2.
- the ethyl silicate 48 is a hydrolyzed condensate (average 10-mer) of tetraethoxysilane manufactured by Colcoat Co., Ltd.
- the fired film of the impurity diffusion composition had an extremely small crack-resistant film thickness and an extremely small mask margin.
- Comparative Example 2 The composition shown in Table 2 was prepared to obtain an impurity diffusion composition. As shown in Table 4, the fired film of the impurity diffusion composition had a very small crack-resistant film thickness and a very small mask margin. Moreover, storage stability was bad and it gelatinized in the refrigerator (4 degreeC) storage for 4 weeks.
- Comparative Example 3 The composition shown in Table 2 was prepared to obtain an impurity diffusion composition. As shown in Table 4, the fired film of the impurity diffusion composition had a small crack resistance film thickness and a large mask film thickness with respect to the p-type impurity diffusing agent, so that a sufficient mask margin could not be obtained. In addition, the sheet resistance was high and the storage stability was poor.
- Comparative Example 4 The composition shown in Table 2 was prepared to obtain an impurity diffusion composition. As shown in Table 4, the fired film of the impurity diffusion composition had a small crack resistance film thickness and a large mask film thickness with respect to the p-type impurity diffusing agent, so that a sufficient mask margin could not be obtained. In addition, the sheet resistance was slightly high and the storage stability was poor.
- Comparative Example 5 The composition shown in Table 2 was prepared to obtain an impurity diffusion composition. As shown in Table 4, the fired film of the impurity diffusion composition had a high sheet resistance because the releasability was poor and the residue remained.
- Comparative Example 6 The composition shown in Table 2 was prepared to obtain an impurity diffusion composition. As shown in Table 4, the fired film of the impurity diffusion composition had a small crack-resistant film thickness and a slightly large mask film thickness for the p-type impurity diffusing agent, so that a sufficient mask margin could not be obtained. Moreover, since the releasability was poor and the residue remained, the sheet resistance value was high.
- the impurity diffusion composition of the present invention is also used for photovoltaic devices such as solar cells, and semiconductor devices that pattern impurity diffusion regions on the semiconductor surface, such as transistor arrays, diode arrays, photodiode arrays, transducers, etc. can do.
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Abstract
Description
(A)一般式(1)で表されるポリシロキサンと、(B)不純物拡散成分とを含有することを特徴とする不純物拡散組成物、である。
半導体基板に上記不純物拡散組成物を印刷して不純物拡散層膜を形成する工程と、前記不純物拡散層膜から不純物を拡散させて不純物拡散層を形成する工程を含む半導体素子の製造方法、である。
本発明の不純物拡散組成物において、不純物拡散成分は、半導体基板中に不純物拡散層を形成するための成分である。n型の不純物拡散成分としては、15族の元素を含む化合物であることが好ましく、中でもリン化合物であることが好ましい。p型の不純物拡散成分としては、13属の元素を含む化合物であることが好ましく、中でもホウ素化合物であることが好ましい。
BC:ブチルカルビトール
TERP:テルピネオール
PEO:ポリエチレンオキサイド
PMMA:ポリメチルメタクリレート
PPO:ポリプロピレンオキサイド
PVP:ポリビニルピロリドン
PVB:ポリビニルブチラール
EtOH:エタノール
PhTMS:フェニルトリメトキシシラン
PhTES:フェニルトリエトキシシラン
TolTMS:p-トリルトリメトキシシラン
MeOPhTMS:p-メトキシフェニルトリメトキシシラン
MeTMS:メチルトリメトキシシラン
EtTMS:エチルトリメトキシシラン
PrTMS:プロピルトリメトキシシラン
BuTMS:ブチルトリメトキシシラン
HexTMS:ヘキシルトリメトキシシラン
MePhDMS:メチルフェニルジメトキシシラン
PhEtTMS:2-フェニルエチルトリメトキシシラン
TEOS:テトラエトキシシラン。
粘度1,000mPa・s未満の不純物拡散組成物は、東機産業(株)製回転粘度計TVE-25L(E型デジタル粘度計)を用い、液温25℃、回転数20rpmでの粘度を測定した。また、粘度1,000mPa・s以上の不純物拡散組成物は、ブルックフィールド製RVDV-11+P(B型デジタル粘度計)を用い、液温25℃、各回転数での粘度を測定した。回転数20rpmでの測定値を粘度とし、回転数20rpmでの測定値(η20)と回転数2rpmでの測定値(η2)の比(η2/η20)をチクソ性とした。
(2-1)スリット塗布性
スリットノズルにより不純物拡散組成物をストライプ状にパターニングし、そのストライプ幅精度を確認した。
スクリーン印刷により不純物拡散組成物をストライプ状にパターニングし、そのストライプ幅精度を確認した。
3cm×3cmにカットしたn型シリコンウェハー((株)フェローテックシリコン製、表面抵抗率410Ω/□)を1%フッ酸水溶液に1分浸漬したあと水洗し、エアブロー後ホットプレートで140℃5分処理した。
n型不純物拡散組成物のp型不純物拡散組成物に対するマスク性を例にとって、マスク性測定方法について説明する。n型不純物拡散組成物からなる上記耐クラック膜厚観察基板(3cm×3cm)上にp型不純物拡散組成物PBF(東京応化工業(株)製)を半分程度(1.5cm×3cm)塗布し、200℃で10分間ホットプレートでプリベークした。その後、シリコンウェハーを電気炉内に配置し、窒素雰囲気下、900℃で60分間維持して不純物を熱拡散させた。熱拡散後、シリコンウェハーを、10重量%のフッ酸水溶液に23℃で1分間浸漬させて、硬化した拡散剤を剥離した。剥離後のシリコンウェハーに対して、表面抵抗を四探針式表面抵抗測定装置RT-70V(ナプソン(株)製)を用いて測定した。ここで、n型不純物拡散性組成物のみを塗布した領域の表面抵抗とn型不純物拡散性組成物上にp型不純物拡散組成物を塗布した領域の表面抵抗の差が±20%以内の場合、マスク性ありと判断した。マスク性がある最低マスク層膜厚サンプルの焼成後膜厚をマスク膜厚とした。
熱拡散後の各シリコンウェハーを、10重量%のフッ酸水溶液に23℃で1分間浸浸させて、拡散剤およびマスクを剥離した。剥離後、シリコンウェハーを純水に浸漬させて洗浄し、表面の目視により残渣の有無を観察した。1分浸漬後目視で表面付着物が確認でき、ウエスでこすっても除去できないものをworse(劣)、1分浸漬後目視で表面付着物が確認できるがウエスでこすることで除去できるものをbad(不可)、30秒を上回り1分以内で表面付着物が目視確認できなくなったものをgood(良)、30秒以内で表面付着物が目視確認できなくなったものをexcellent(優)とした。
3cm×3cmにカットしたn型シリコンウェハー((株)フェローテックシリコン製、表面抵抗率410Ω/□)を1%フッ酸水溶液に1分浸漬したあと水洗し、エアブロー後ホットプレートで140℃5分処理した。
不純物拡散組成物を冷蔵庫(4℃)で4週間保管し、4週間後の粘度が初期の粘度に対して、粘度変化3%未満の場合excellent(優)、3%以上6%未満の場合good(良)、6%以上10%未満の場合bad(不可)、粘度変化が10%以上もしくは沈殿、白濁、ゲル化などが起こった場合は、worse(劣)とした。
ポリシロキサン溶液の合成
500mLの三口フラスコにKBM-13(メチルトリメトキシシラン)を164.93g(1.21mol)、KBM-103(フェニルトリメトキシシラン)を204.07g(1.21mol)、GBLを363.03g仕込み、40℃で攪拌しながら水130.76gにリン酸0.1.215gを溶かしたリン酸水溶液を30分かけて添加した。滴下終了後、40℃で1時間撹拌した後、70℃に昇温し、30分撹拌した。その後、オイルバスを115℃まで昇温した。昇温開始1時間後に溶液の内温が100℃に到達し、そこから1時間加熱攪拌した(内温は100~110℃)。得られた溶液を氷浴にて冷却し、ポリシロキサン溶液を得た。ポリシロキサン溶液の固形分濃度は39.8重量%であった。
表1記載の組成で調合し、不純物拡散組成物を得た。耐クラック性、マスク性、剥離性、パターン精度、保存安定性、シート抵抗値を測定したところ、表3に示すとおり、いずれも良好であった。特に、ポリシロキサン中の炭素数6~15のアリール基の比率を増加したものでは、より大きい膜厚であってもクラックが入りにくく、耐クラック性が良好であった。
実施例9~41では各種増粘剤を溶液全体に対して所定の重量%濃度になるように添加し、自転・公転ミキサーARE-310((株)シンキー製)を用いて溶解させた(撹拌:15分、脱泡:1分)。耐クラック性、不純物拡散性、マスク性、剥離性、パターン精度、保存安定性、シート抵抗値を測定したところ、表3および表4に示すとおり、いずれも良好であった。ポリシロキサンの構成ユニットがすべて3官能性のオルガノシランであるものが、不純物拡散性、剥離性に優れていた。ポリシロキサン中のアリール基比率が40モル%以上のものが、不純物拡散性、マスク性に優れており、80モル%以下のものが、剥離性が特に良好であった。
n型不純物拡散層およびp型不純物拡散層形成方法
図6(a)に示すように、p型シリコンウェハー51((株)フェローテックシリコン製、表面抵抗率410Ω/□)上の一部にスクリーン印刷法により実施例1記載のn型不純物拡散組成物52を塗布した。塗布後、p型シリコンウェハー51を140℃5分間プリベークした。
n型不純物拡散層およびp型不純物拡散層形成方法
図7(a)に示すように、p型シリコンウェハー61((株)フェローテックシリコン製、表面抵抗率410Ω/□)上の一部にスクリーン印刷法により実施例1記載のn型不純物拡散組成物62を塗布した。塗布後、P型シリコンウェハー61を100℃5分間プリベークした。
表1および表2記載の組成で調合し、不純物拡散組成物を得た。なお、エチルシリケート48とはコルコート(株)製でテトラエトキシシランの加水分解縮合物(平均10量体)である。表3および表4に示すとおり、不純物拡散組成物の焼成膜は、耐クラック膜厚が極めて小さく、マスクマージンが極めて小さかった。
表2記載の組成で調合し、不純物拡散組成物を得た。表4に示すとおり、不純物拡散組成物の焼成膜は、耐クラック膜厚が極めて小さく、マスクマージンが極めて小さかった。また、保存安定性が悪く、4週間の冷蔵庫(4℃)保管でゲル化した。
表2記載の組成で調合し、不純物拡散組成物を得た。表4に示すとおり、不純物拡散組成物の焼成膜は、耐クラック膜厚が小さく、p型不純物拡散剤に対するマスク膜厚が大きいため、十分なマスクマージンが得られなかった。また、シート抵抗値も高く、保存安定性も悪かった。
表2記載の組成で調合し、不純物拡散組成物を得た。表4に示すとおり、不純物拡散組成物の焼成膜は、耐クラック膜厚が小さく、p型不純物拡散剤に対するマスク膜厚が大きいため、十分なマスクマージンが得られなかった。また、シート抵抗値も少し高く、保存安定性も悪かった。
表2記載の組成で調合し、不純物拡散組成物を得た。表4に示すとおり、不純物拡散組成物の焼成膜は、剥離性が悪く残渣が残ったため、シート抵抗値が高かった。
表2記載の組成で調合し、不純物拡散組成物を得た。表4に示すとおり、不純物拡散組成物の焼成膜は、耐クラック膜厚が小さく、p型不純物拡散剤に対するマスク膜厚が少し大きいため、十分なマスクマージンが得られなかった。また、剥離性が悪く残渣が残ったため、シート抵抗値が高かった。
2 n型不純物拡散組成物
3 n型不純物拡散層
4 p型不純物拡散組成物
5 p型不純物拡散層
6 保護膜
6a 保護膜開口
7 n型コンタクト電極
8 p型コンタクト電極
9 裏面接合型太陽電池
30 ストライプ塗布装置
31 半導体基板
32 ステージ
33 リニア駆動装置(X方向)
34 リニア駆動装置(Y方向)
35 ブラケット
36 CCDカメラ
37 高さセンサー
38 ノズル
40 半導体基板
41 ノズル
42 吐出口
43 ペースト
44 ビード
45 マニホールド
46 加圧口
47 ペースト供給口
51 p型シリコンウェハー
52 n型不純物拡散組成物
53 n型不純物拡散層
54 p型不純物拡散組成物
55 p型不純物拡散層
61 p型シリコンウェハー
62 n型不純物拡散組成物
63 n型不純物拡散層
64 p型不純物拡散組成物
65 p型不純物拡散層
Claims (10)
- (A)一般式(1)で表されるポリシロキサンと、(B)不純物拡散成分とを含有する不純物拡散組成物。
- R2およびR4が水酸基、炭素数1~6のアルコキシ基、炭素数1~6のアシルオキシ基のいずれかを表し、R3が炭素数1~4のアルキル基または炭素数2~4のアルケニル基である請求項1記載の不純物拡散組成物。
- n:m=80:20~40:60である請求項1または2記載の不純物拡散組成物。
- 前記(A)ポリシロキサンの20%熱分解温度が550℃以上である請求項1~3のいずれかに記載の不純物拡散組成物。
- さらに(C)増粘剤を前記組成物に対し3重量%以上20重量%以下含有する請求項1~4のいずれかに記載の不純物拡散組成物。
- 半導体基板に拡散層を形成するために印刷により基板上に塗布される請求項1~5のいずれかに記載の不純物拡散組成物。
- 前記印刷がスクリーン印刷である請求項6記載の不純物拡散組成物。
- 半導体基板に請求項1~7のいずれかに記載の不純物拡散組成物を印刷して不純物拡散組成物膜を形成する工程と、前記不純物拡散組成物膜から不純物を拡散させて不純物拡散層を形成する工程を含む半導体素子の製造方法。
- 前記不純物拡散組成物膜が不純物拡散組成物パターンである請求項8記載の半導体素子の製造方法。
- 前記印刷がスクリーン印刷である請求項8または9記載の半導体素子の製造方法。
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WO2016136474A1 (ja) * | 2015-02-25 | 2016-09-01 | 東レ株式会社 | p型不純物拡散組成物、それを用いた半導体素子の製造方法ならびに太陽電池およびその製造方法 |
WO2018021117A1 (ja) * | 2016-07-26 | 2018-02-01 | 東レ株式会社 | 半導体素子の製造方法および太陽電池の製造方法 |
WO2019176716A1 (ja) * | 2018-03-16 | 2019-09-19 | 東レ株式会社 | 不純物拡散組成物、それを用いた半導体素子の製造方法および太陽電池の製造方法 |
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EP3018699A4 (en) | 2017-02-22 |
EP3018699B1 (en) | 2018-02-14 |
PH12015502750A1 (en) | 2016-03-21 |
MY177765A (en) | 2020-09-23 |
KR102097378B1 (ko) | 2020-04-06 |
JPWO2015002132A1 (ja) | 2017-02-23 |
JP6361505B2 (ja) | 2018-07-25 |
KR20160030513A (ko) | 2016-03-18 |
CN105378895A (zh) | 2016-03-02 |
PH12015502750B1 (en) | 2016-03-21 |
TW201504361A (zh) | 2015-02-01 |
US9691935B2 (en) | 2017-06-27 |
TWI624512B (zh) | 2018-05-21 |
EP3018699A1 (en) | 2016-05-11 |
US20160372626A1 (en) | 2016-12-22 |
CN105378895B (zh) | 2018-03-02 |
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