Abstract:
Una composición acuosa alcalina de grabado y de limpieza que comprende: (A) al menos un hidróxido de amonio cuaternario; preferiblemente seleccionado del grupo que consiste en hidróxido de tetrametilamonio e hidróxido de tetraetilamonio; y (B) al menos un componente seleccionado del grupo que consiste en (b1) ácidos sulfónicos solubles en agua y sus sales solubles en agua de fórmula general I: (R1-SO3-)nXn+ (I), (b2) ácidos fosfónicos solubles en agua y sus sales solubles en agua de fórmula general II: R-PO32-(Xn+)3-n (II), (b3) ésteres de ácido sulfúrico solubles en agua y sus sales solubles en agua de fórmula general III: (RO-SO3-)nXn+ (III), (b4) ésteres de ácido fosfórico solubles en agua y sus sales solubles en agua de fórmula general (IV): RO-PO32-(Xn+)3-n (IV), y (b5) ésteres de ácido fosfórico solubles en agua y sus sales solubles en agua de fórmula general (V): [(RO)2PO2 -]nXn+ (V); en las que el índice n = 1 o 2; la variable X se selecciona del grupo que consiste en hidrógeno, metal alcalino y metal alcalinotérreo; la variable R1 se selecciona del grupo que consiste en restos alifáticos que tienen de 2 a 5 átomos de carbono y al menos un doble enlace olefínicamente insaturado, y restos cicloalifáticos que tienen de 4 a 6 átomos de carbono y al menos un doble enlace olefínicamente insaturado; preferiblemente, por lo que R1 se selecciona de vinilo, prop-1-en-1-ilo, prop-2-en-1-ilo (alilo) y alfa-metil-vinilo; y la variable R se selecciona del grupo que consiste en restos alifáticos que tienen 2 a 5 átomos de carbono y al menos un doble enlace olefínicamente insaturado, restos cicloalifáticos que tienen 4 a 6 átomos de carbono y al menos un doble enlace olefínicamente insaturado, y restos alquilarilo, en los que los restos arilo se seleccionan de benceno y naftaleno, los restos alquilo se seleccionan de metileno, etano-diilo y propano-diilo, y R se selecciona preferiblemente de vinilo, prop-1-en-1-ilo, prop-2-en-1-ilo (alilo), alfa-metil-vinilo y bencilo; y el átomo de fósforo en la fórmula general II está unido directamente y el átomo de azufre en la fórmula general III y el átomo de fósforo en las fórmulas generales IV y V están unidos cada uno a través de un átomo de oxígeno a un átomo de carbono alifático; preferiblemente, por lo que la composición se caracteriza porque su pH es de 8 a 13.
Abstract:
AN AQUEOUS ALKALINE ETCHING AND CLEANING COMPOSITION FOR TREATING THE SURFACE OF SILICON SUBSTRATES, THE SAID COMPOSITION COMPRISING: (A) A QUATERNARY AMMONIUM HYDROXIDE; AND (B) A COMPONENT SELECTED FROM THE GROUP CONSISTING OF WATER-SOLUBIE ACIDS AND THEIR WATERE-SOLUBLE SALTS OF THE GENERAL FORMULAS (I) TO (V): (R1-SO3-)nXn+ (I), R-PO32- (Xn+)3-n (II); (RO-SO3-)nXn+ (III), RO-PO32- (Xn+)3-n (IV), and [(RO)2P02-]nXn+ (V); WHEREIN THE n = 1 OR 2; X IS HYDROGEN OR ALKALINE OR ALKALINE-EARTH METAL; THE VARIABLE R1 IS AN OLEFINICALLY UNSATURATED ALIPHATIC OR CYCLOALIPHATIC MOIETY AND R IS R1 OR AN ALKYLARYL MOIETY; THE USE OF THE COMPOSITION FOR TREATING SILICON SUBSTRATES, A METHOD FOR TREATING THE SURFACE OF SILICON SUBSTRATES, AND METHODS FOR MANUFACTURING DEVICES GENERATING ELECTRICITY UPON THE EXPOSURE TO ELECTROMAGNETIC RADIATION.
Abstract:
An aqueous acidic solution and an aqueous acidic etching solution suitable for texturizing the surface of single crystal and polycrystal silicon substrates, hydrofluoric acid; nitric acid; and at least one anionic polyether, which is surface active; a method for texturizing the surface of single crystal and polycrystal silicon substrates comprising the step of (1 ) contacting at least one major surface of a substrate with the said aqueous acidic etching solution; (2) etching the at least one major surface of the substrate for a time and at a temperature sufficient to obtain a surface texturization consisting of recesses and protrusions; and (3) removing the at least one major surface of the substrate from the contact with the aqueous acidic etching solution; and a method for manufacturing photovoltaic cells and solar cells using the said solution and the said texturizing method.
Abstract:
An aqueous alkaline etching and cleaning composition for treating the surface of silicon substrates, the said composition comprising: (A) a quaternary ammonium hydroxide; and (B) a component selected from the group consisting of water-soluble acids and their water-soluble salts of the general formulas (I) to (V): (R1-S03-)nXn+ (I), R-P032- (Xn+)3-n (II); (RO-S03-)nXn+ (III), RO-P032- (Xn+)3-n, (IV), and [(RO)2P02-] nXn+ (V); wherein the n = 1 or 2; X is hydrogen or alkaline or alkaline-earth metal; the variable R1 is an olefinically unsaturated aliphatic or cycloaliphatic moiety and R is R1 or an alkylaryl moiety; the use of the composition for treating silicon substrates, a method for treating the surface of silicon substrates, and methods for manufacturing devices generating electricity upon the exposure to electromagnetic radiation.
Abstract:
An aqueous acidic etching solution suitable for texturing the surface of single crystal and polycrystal silicon substrates and containing, based on the complete weight of the solution, 3 to 10% by weight of hydrofluoric acid; 10 to 35% by weight of nitric acid; 5 to 40% by weight of sulfuric acid; and 55 to 82% by weight of water; a method for texturing the surface of single crystal and polycrystal silicon substrates comprising the step of (1) contacting at least one major surface of a substrate with the said aqueous acidic etching solution; (2) etching the at least one major surface of the substrate for a time and at a temperature sufficient to obtain a surface texture consisting of recesses and protru- sions; and (3) removing the at least one major surface of the substrate from the contact with the aqueous acidic etching solution; and a method for manufacturing photovoltaic cells and solar cells using the said solution and the said texturing method.
Abstract:
A photoresist stripping and cleaning composition free from N-alkylpyrrolidones and added quaternary ammonium hydroxides comprising a component (A) which comprises the polar organic solvents N-methylimidazole, dimethylsulfoxide and 1-aminopropane-2-ol.
Abstract:
An aqueous alkaline etching and cleaning composition for treating the surface of silicon substrates, the said composition comprising: (A) a quaternary ammonium hydroxide; and (B) a component selected from the group consisting of water-soluble acids and their water-soluble salts of the general formulas (I) to (V): (R1—S03-)nXn+ (I), R—P032−(Xn+)3-n (II); (RO—S03-)nXn+ (III), RO—P032−(Xn+)3-n, (IV), and [(RO)2P02−]nXn+ (V); wherein the n=1 or 2; X is hydrogen or alkaline or alkaline-earth metal; the variable R1 is an olefinically unsaturated aliphatic or cycloaliphatic moiety and R is R1 or an alkylaryl moiety; the use of the composition for treating silicon substrates, a method for treating the surface of silicon substrates, and methods for manufacturing devices generating electricity upon the exposure to electromagnetic radiation.