Patent ID: 9093598
Filing Date: 2015-07-28
Classification: H01L,Y02E,Y02P

Abstract:
1. A method of simultaneously diffusing dopants of different types on respective sides of a silicon wafer comprising the steps of: applying a first liquid doping material to a first side of the wafer; applying a second liquid doping material different from the first liquid doping material to a second side of the wafer; and heating the wafer to diffuse simultaneously the first liquid doping material into the first side of the wafer and the second liquid doping material into the second side of the wafer; wherein the first liquid doping material includes a Group III dopant; and wherein the first liquid doping material is a solution comprising boric acid, 1-methyl, 2-pyrrolidinone, polyvinylpyrrolidone, and 2-propanol.