Patent ID: 6346486
Filing Date: 2002-02-12
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device including at least one thin film transistor having at least source and drain regions, a channel forming region and at least one lightly doped region, said method comprising the steps of:forming a semiconductor film comprising amorphous silicon on an insulating surface; providing said semiconductor film with a crystallization promoting material for promoting crystallization of said semiconductor film wherein said crystallization promoting material comprises a metal or a metal compound; heating said semiconductor film and said crystallization promoting material in order to crystallize said semiconductor film; selectively introducing a first impurity into the crystallized semiconductor film at a first concentration for forming said at least one lightly doped region; selectively introducing a second impurity having a same conductivity type as said first impurity into the crystallized semiconductor film at a second concentration for forming said source and drain regions, said second concentration greater than said first concentration; heating said semiconductor film in order to activate the first and second impurities in said source and drain regions and said at least one lightly doped region.