Patent ID: 9691628
Date: 2017-06-27
CPC Classifications: B81C,H01L

Claim:
1. A method for selectively removing silicon nitride in a spray processing system, comprising: (a) providing a substrate having a surface with silicon nitride exposed on at least one portion of said surface and SiGe (b) dispensing sulfuric acid and an oxidizing agent as a mixture onto said surface of said substrate in the presence of water vapor to oxidize said exposed SiGe (c) following step (b), dispensing a silicon nitride etching agent as a liquid stream onto said surface of said substrate to remove at least a portion of said silicon nitride: wherein steps (b) and (c) are carried out in a spray processing system further comprising: repeating steps (b) and (c) two or more cycles to selectively remove a target amount of said silicon nitride.