Patent ID: 8044009

Claim:
A FEOL stripping and cleaning method for stripping/cleaning unashed ion-implanted photoresist from a wafer substrate, the process comprising conducting the process without supercritical CO 2 and comprises contacting the unashed ion-implanted photoresist on a wafer substrate with a FEOL stripping/cleaning composition for a time sufficient to clean the wafer substrate of the unashed ion-implanted photoresist, wherein the FEOL stripping/cleaning composition comprises: a) at least one organic stripping solvent, b) fluoride ions from at least one of ammonium fluoride, ammonium bifluoride and hydrogen fluoride, c) at least one acidifying agent selected from inorganic or organic acids other than HF, d) water, and e) at least one oxidizing agent: wherein the at least one acidifying agent selected from inorganic or organic acids other than HF is present in an amount to produce an overall acidic solution of pH>5.