Patent ID: 7964423

Claim:
A method for manufacturing a semiconductor device, comprising: forming a first pixel electrode over a semiconductor substrate; forming an insulating film over the first pixel electrode and the semiconductor substrate; implanting ions including hydrogen into the insulating film to form a separation layer having a porous structure in the semiconductor substrate; forming a bonding layer over the insulating film; performing heat treatment in a state in which the semiconductor substrate and a substrate having an insulating surface are superposed on each other with the bonding layer interposed therebetween to generate a crack in the separation layer and to separate the semiconductor substrate at the separation layer while a single-crystal semiconductor layer is left remaining over the substrate having the insulating surface; etching the single-crystal semiconductor layer to form the single-crystal semiconductor layer into an island-shaped single-crystal semiconductor layer and to form a protective layer for the first pixel electrode; forming a gate insulating film and a gate electrode over the island-shaped single-crystal semiconductor layer; adding an impurity element which imparts one conductivity type to the island-shaped single-crystal semiconductor layer with the use of the gate electrode as a mask to form a channel formation region in a region below the gate electrode and to form high-concentration impurity regions which serve as a source region and a drain region in regions where the gate electrode is not formed; etching the protective layer to expose the first pixel electrode; forming an interlayer insulating film which covers the island-shaped single-crystal semiconductor layer, the gate insulating film, and the gate electrode; forming a wiring which electrically connects one of the high-concentration impurity regions and the first pixel electrode to each other over the interlayer insulating film; forming a partition which covers the interlayer insulating film, the island-shaped single-crystal semiconductor layer, the gate insulating film, and the gate electrode and has an opening in a region over the first pixel electrode; forming a light-emitting layer in a region which is over the first pixel electrode and surrounded by the partition; and forming a second pixel electrode which is electrically connected to the light-emitting layer over the light-emitting layer and the partition, wherein a surface of the first pixel electrode, which is in contact with the light-emitting layer, is flat, and wherein a surface where the island-shaped single-crystal semiconductor layer is in contact with the insulating film roughly coincides with a surface where the first pixel electrode is in contact with the light-emitting layer.