Patent ID: 7837890
Filing Date: 2010-11-23
Classification: C03C,C09K,H01L,Y02E,Y02P

Abstract:
1. A printable etching medium in the form of a paste for etching and optionally doping inorganic glass-like or crystalline layers selected from the group of glasses based on silicon dioxide and the glasses based on silicon nitride, which are located on crystalline or amorphous silicon surfaces, comprising a) an etching component b) solvent c) polymer particles having a relative particle diameter in the range from 10 nm to 50 μm, d) optionally a homogeneously dissolved organic thickener e) optionally at least one inorganic and/or organic acid, f) optionally an additive and g) optionally inorganic particles, said medium having a viscosity at 20° C. in the range from 6 to 35 Pa*s at a shear rate of 25 s