Patent ID: 6465287
Filing Date: 2002-10-15
Classification: H01L

Abstract:
A method for fabricating a semiconductor device, comprising steps of:forming a semiconductor film comprising amorphous silicon over a substrate having an insulating surface, said semiconductor film having a concentration of oxygen within a range of 5Ã—1017 cmâˆ’3 to 2Ã—1019 cmâˆ’3; intentionally introducing a metal element which promotes crystallization of silicon into said semiconductor film; obtaining a crystalline semiconductor film by crystallizing said semiconductor film by a first heat treatment in a temperature range of 750Â° C. to 1100Â° C.; forming an active layer of said semiconductor device by patterning said crystalline semiconductor film; removing or reducing said metal element existing within said crystalline semiconductor film by performing a second heat treatment within an oxidizing atmosphere containing a halogen element; removing a thermal oxide film formed in the previous step; and forming another thermal oxide film after removing said thermal oxide film by performing another thermal oxidation, wherein a temperature of said second heat treatment is higher than that of said first heat treatment.