Patent ID: 6475888
Filing Date: 2002-11-05
Classification: H01L

Abstract:
A method for forming an ultra-shallow junction using laser annealing comprising the steps of:preparing a silicon substrate having isolation layers; forming a gate having a stacked structure of a gate insulating layer, a polysilicon layer and a metal layer on the silicon substrate; forming a sacrificial spacer on the sidewalls of the gate; forming source and drain regions on the silicon substrate regions at both sides of the gate, including on the sacrificial spacer; removing the sacrificial spacer; doping impurities to form a source/drain extension doping layer on the silicon substrate regions at both sides of the gate; depositing sequentially a reaction preventing layer and an amorphous carbon layer as a laser absorber layer on the resulting structure forming source/drain extension doping layers on inner sides of the source and drain regions by performing laser annealing in an atmosphere of essentially inert gas or under vacuum; and removing the amorphous carbon layer.