Patent ID: 8142673
Filing Date: 2012-03-27
Classification: B08B,C09K,C11D,C23G,G03F,H01L,Y10S

Abstract:
1. A method for surface treating wafer surfaces, comprising: treating a wafer surface to remove at least a portion of a trimethylsilane or dimethylsilane dielectric layer selective to an overlying photoresist layer, by applying an aqueous composition comprising a 2:1 (v/v) ratio of a dilute solution of ammonium fluoride and a dilute solution of one or more organic acids, the composition having a pH of about 4 to about 6, such that the composition provides an etch selectivity ratio of dielectric:organic material of about 50:1 to about 1000:1, and the dielectric layer is removed selective to the photoresist at a rate of about 50 to about 150 angstroms per minute.