SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME
First Claim
Patent Images
1. A semiconductor device comprising:
- an oxide semiconductor layer comprising a source region, a drain region, and a channel formation region over an insulating surface;
a gate insulating film over the oxide semiconductor layer;
a gate electrode over the gate insulating film, the gate electrode overlapping with the channel formation region;
a source electrode in contact with the source region; and
a drain electrode in contact with the drain region,wherein the source region and the drain region comprise a portion having a higher oxygen concentration than the channel formation region.
1 Assignment
0 Petitions
Accused Products
Abstract
A transistor excellent in electrical characteristics and a method for manufacturing the transistor are provided. The transistor includes an oxide semiconductor layer including a source region, a drain region, and a channel formation region over an insulating surface; a gate insulating film over the oxide semiconductor layer; a gate electrode overlapping with the channel formation region, over the gate insulating film; a source electrode in contact with the source region; and a drain electrode in contact with the drain region. The source region and the drain region include a portion having higher oxygen concentration than the channel formation region.
27 Citations
19 Claims
-
1. A semiconductor device comprising:
-
an oxide semiconductor layer comprising a source region, a drain region, and a channel formation region over an insulating surface; a gate insulating film over the oxide semiconductor layer; a gate electrode over the gate insulating film, the gate electrode overlapping with the channel formation region; a source electrode in contact with the source region; and a drain electrode in contact with the drain region, wherein the source region and the drain region comprise a portion having a higher oxygen concentration than the channel formation region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A semiconductor device comprising:
-
a source electrode and a drain electrode over an insulating surface; an oxide semiconductor layer comprising a source region, a drain region, and a channel formation region over the source electrode, the drain electrode, and the insulating surface; a gate insulating film over the oxide semiconductor layer; and a gate electrode over the gate insulating film, the gate electrode overlapping with the channel formation region, wherein the source electrode is in contact with the source region and the channel formation region, wherein the drain electrode is in contact with the drain region and the channel formation region, and wherein the source region and the drain region comprise a portion having a higher oxygen concentration than the channel formation region. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A method for manufacturing a semiconductor device, comprising the steps of:
-
forming an oxide semiconductor layer over an insulating surface; forming a gate insulating film over the oxide semiconductor layer; forming a gate electrode over the gate insulating film so as to overlap with the oxide semiconductor layer; and adding oxygen to a region which is in the oxide semiconductor layer and does not overlap with the gate electrode.
-
Specification