Patent ID: 8143172
Filing Date: 2012-03-27
Classification: C03C,C09K,H01L,Y02E

Abstract:
1. A method for the etching of extremely fine lines or structures in a silicon oxide, silicon nitride or glass layer or for the doping of a silicon oxide, silicone nitride or glass layer comprising applying a printable composition in the form of paste onto said layer, wherein the printable composition in the form of a paste comprises: a finely particulate inorganic powder of graphite and/or carbon black having a relative particle diameter of less than 5 μm; a finely particulate organic powder in the form of a finely particulate plastic powder having a relative particle diameter in the range from 10 nm to 50 μm selected from the group of polystyrenes, polyacrylates, polyamides, polyimides, polymethacrylates, melamine resin, urethane resin, benzoguanine resin, phenolic resin, silicone resins, micronised cellulose, fluorinated polymers (PTFE, PVDF) and micronised waxes; optionally, a finely particulate inorganic powder selected from the group of aluminum oxide, calcium fluoride, boron oxide, sodium chloride; one or more forms of phosphoric acid, a phosphoric acid salt or a compound which decomposes to the corresponding phosphoric acid, or at least one of hydrochloric acid, sulfuric acid or nitric acid, as etching component; and optionally, at least one organic acid selected from the group of alkylcarboxylic acids, hydroxycarboxylic acids and dicarboxylic acids.