Patent ID: 7598141
Filing Date: 2009-10-06
Classification: H01L

Abstract:
1. A method of fabricating a static random access memory (SRAM), the method comprising: selectively removing an insulating film; growing a single crystalline silicon layer using selective epitaxial growth, the single crystalline silicon layer grown in an area from which the insulating film is removed; recessing the insulating film to expose a portion of side surfaces of the single crystalline layer and to form a single crystalline silicon protrusion extending above a top surface of the insulating film; depositing an amorphous silicon layer on the single crystalline silicon layer and the insulating film, the amorphous silicon layer completely covering a top surface and exposed side surfaces of the single crystalline silicon layer, wherein a top surface of the amorphous silicon layer directly covering the side surfaces of the single crystalline silicon protrusion is higher than a top surface of the amorphous silicon covering the insulating film; and performing an annealing process on the amorphous silicon layer to crystalline the amorphous silicon layer by using the single crystalline silicon layer as a seed, wherein the increased height of the top surface of the amorphous silicon covering the side surfaces of the single crystalline silicon protrusion prevents a thinning phenomenon of the amorphous silicon around the side surfaces of the single crystalline silicon layer during the annealing process.