Patent ID: 7244990

Claim:
A semiconductor device, comprising: an insulating substrate having a surface on which a first SiO 2 film is formed; a single-crystal silicon thin film having bonded thereto a second SiO 2 film, which single-crystal silicon thin film is bonded with the insulating substrate on a partial region of the insulating substrate via the first and second SiO 2 films; and a non-single-crystal silicon thin film comprising an active area of a transistor and formed on the insulating substrate in a region where the single-crystal silicon thin film is not bonded with the insulating substrate, which non-single-crystal silicon thin film is formed on the insulating substrate via the first SiO 2 film and a third SiO 2 film, wherein the second SiO 2 film and the third SiO 2 film are of different thicknesses.