Patent ID: 6452213
Filing Date: 2002-09-17
Classification: H01L

Abstract:
A semiconductor device comprising:an insulating base; a first non-crystalline thin film formed on said insulating base; a second non-crystalline thin film formed on at least a portion of a surface of said first thin film; a polycrystalline semiconductor thin film formed on a surface of said second thin film or on the surfaces of said second thin film and said first thin film; a field effect transistor having a channel formed of a portion of said polycrystalline semiconductor thin film, wherein said second thin film has a thermal conductivity higher than a thermal conductivity of said first thin film and lower than a thermal conductivity of said polycrystalline semiconductor thin film; wherein said second thin film is disposed on at least a portion of a region of said first thin film corresponding to said channel in a predetermined pattern; a light shielding film disposed between said first thin film and said second thin film in substantially the same pattern as said predetermined pattern of said second thin film; and a source region and a drain region of said field effect transistor disposed in said polycrystalline semiconductor thin film in self alignment with said light shielding film.