Patent ID: 6066267
Filing Date: 2000-05-23
Classification: H01L

Abstract:
An etching composition suitable for etching silicon nitride at a rate greater than for silicon dioxide and containing about 0.1 to about 3.0 molar of a fluoride containing compound, an organic solvent selected from the group consisting of propylene carbonate, N-methyl pyrrolidone, gamma butyrolactone, methylene chloride, benzyl alcohol, N-formyl morpholine, N-formyl piperidine, cyclohexanone, cyclopentanone methyl benzoate, diglyme, 2-methyl tetrahydrofuran, methyl and ethyl esters of acid selected from the group consisting of phthalic acid, isophthalic acid and terephthalic acid; and about 0.1 to about 4 molar of water.