Patent ID: 9040401
Filing Date: 2015-05-26
Classification: H01L,Y02E,Y02P

Abstract:
1. A method for forming doping regions, comprising: providing a substrate; forming a doping material on the substrate; forming at least one patterned covering layer on a portion of the surface of the doping material, wherein the portion of the doping material is covered by the at least one patterned covering layer, and another portion of the doping material not covered by the at least one patterned covering layer is exposed; and performing a thermal diffusion process to diffuse the doping material into the substrate, forming a first doping region in a portion of the substrate underlying the at least one patterned covering layer and forming a second doping region in a portion of the substrate not covered by the at least one patterned covering layer, wherein the doping concentration of the first doping region is greater than the doping concentration of the second doping region.