Patent ID: 7241663
Filing Date: 2007-07-10
Classification: H01L

Abstract:
1. A method of forming a polysilicon resistor device comprising: forming an insulative layer over a semiconductor substrate; forming a polysilicon layer on the insulative layer; defining at least a portion of the polysilicon layer as a polysilicon resistor; forming a resistor mask having an exposure pattern on the polysilicon layer, wherein the exposure pattern exposes a portion of the polysilicon resistor; implanting a selected dopant into the polysilicon layer through the exposure pattern; forming a second resistor mask having a second exposure pattern on the polysilicon layer; and implanting a second dopant into the polysilicon layer through the second exposure pattern, wherein the second dopant is of an opposite conductivity type than the selected dopant; and performing a thermal activation process that diffuses the implanted dopant in the polysilicon layer.