Patent ID: 6146934
Filing Date: 2000-11-14
Classification: H01L

Abstract:
A method for forming a PMOS device, comprising:(a) forming a gate electrode over a device region of a substrate;(b) forming spacers on sidewalls of the gate electrode;(c) forming active regions adjacent to the gate electrode by multiple implantations of p-type dopant material using at least one spacer as a mask for each implantation, the step of forming the active regions comprising:(i) selectively implanting a first p-type dopant material into active regions adjacent to the gate electrode using the spacers as a mask;(ii) removing at least a portion of one of the spacers and forming a thinner spacer on the gate electrode; and(iii) selectively implanting a second p-type dopant material, comprising a heavy atom species, into a first one of the active regions using the thinner spacer as a mask, wherein the heavy atom species is an indium or gallium species.