Patent ID: 8415228

Claim:
A manufacturing method of a semiconductor device comprising the steps of: forming an insulating film over a bond substrate; forming an embrittlement layer by adding ions from a surface of the bond substrate; bonding the bond substrate to a glass substrate with the insulating film interposed therebetween; separating the bond substrate along the embrittlement layer to form a first semiconductor film over the glass substrate with the insulating film interposed therebetween; removing a peripheral region of the insulating film and the first semiconductor film to expose a part of the glass substrate, wherein the insulating film and the first semiconductor film are formed to be a rectangular shape with rounded four corners; forming at least second and third semiconductor films by etching the first semiconductor film; forming a gate insulating film over and in contact with the second and the third semiconductor films, a portion of the insulating film between the second and the third semiconductor films, and the part of the glass substrate; and forming a stacked conductive film over and in contact with the gate insulating film, wherein the stacked conductive film includes a conductive film having a tensile stress and a conductive film having a compressive stress.