Patent ID: 7476577
Filing Date: 2009-01-13
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, comprising: forming a first insulating film over a substrate; forming a second insulating film over the first insulating film; forming a semiconductor island comprising crystalline silicon by a crystallizing method using a catalytic element over the second insulating film; forming a third insulating film over the semiconductor island; forming source and drain regions including phosphorus in the semiconductor island with a channel formation region therebetween; and performing a heat treatment for reducing a concentration of the catalytic element in the channel formation region, wherein the heat treatment is performed for segregating the catalytic element into the source and drain regions, wherein the first insulating film includes nitrogen at a first concentration, wherein the second insulating film includes nitrogen at a second concentration, wherein the third insulating film includes nitrogen at a third concentration, and wherein the first concentration is higher than each of the second concentration and the third concentration.