Semiconductor device and method for manufacturing the same
First Claim
1. A display device comprising:
- a gate electrode over a substrate;
a gate insulating layer over the gate electrode;
an oxide semiconductor layer over the gate insulating layer;
a first insulating layer over and in contact with the oxide semiconductor layer, the first insulating layer comprising silicon oxide; and
a source electrode and a drain electrode over the first insulating layer,wherein the gate electrode comprises;
a first layer comprising a metal selected from Cr, Ta, Ti, Mo, and W; and
a second layer comprising Cu, andwherein the gate insulating layer comprises a stack of a silicon nitride layer and a silicon oxide layer.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is a semiconductor device comprising a thin film transistor and wirings connected to the thin film transistor, in which the thin film transistor has a channel formation region in an oxide semiconductor layer, and a copper metal is used for at least one of a gate electrode, a source electrode, a drain electrode, a gate wiring, a source wiring, and a drain wiring. The extremely low off current of the transistor with the oxide semiconductor layer contributes to reduction in power consumption of the semiconductor device. Additionally, the use of the copper metal allows the combination of the semiconductor device with a display element to provide a display device with high display quality and negligible defects, which results from the low electrical resistance of the wirings and electrodes formed with the copper metal.
323 Citations
57 Claims
-
1. A display device comprising:
-
a gate electrode over a substrate; a gate insulating layer over the gate electrode; an oxide semiconductor layer over the gate insulating layer; a first insulating layer over and in contact with the oxide semiconductor layer, the first insulating layer comprising silicon oxide; and a source electrode and a drain electrode over the first insulating layer, wherein the gate electrode comprises; a first layer comprising a metal selected from Cr, Ta, Ti, Mo, and W; and a second layer comprising Cu, and wherein the gate insulating layer comprises a stack of a silicon nitride layer and a silicon oxide layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A display device comprising:
-
a gate electrode over a substrate; a gate insulating layer over the gate electrode; an oxide semiconductor layer over the gate insulating layer; a first insulating layer over and in contact with the oxide semiconductor layer, the first insulating layer comprising silicon oxide; and a source electrode and a drain electrode over the first insulating layer, wherein the gate electrode comprises; a first layer comprising two metal elements selected from Cr, Ta, Ti, Mo, and W; and a second layer comprising Cu, and wherein the gate insulating layer comprises a stack of a silicon nitride layer and a silicon oxide layer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
-
-
30. A display device comprising:
-
a gate electrode over a substrate; a gate insulating layer over the gate electrode; an oxide semiconductor layer over the gate insulating layer; a source electrode and a drain electrode over the oxide semiconductor layer; and a first insulating layer over and in contact with the source electrode, the drain electrode, and the oxide semiconductor layer; wherein the gate insulating layer comprises a stack of a first silicon nitride layer and a first silicon oxide layer, and wherein the first insulating layer comprises a second silicon oxide layer and a second silicon nitride layer. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
-
-
38. A display device comprising:
-
a gate electrode over a substrate; a gate insulating layer over the gate electrode; an oxide semiconductor layer over the gate insulating layer; a first insulating layer over and in contact with the oxide semiconductor layer, the first insulating layer comprising silicon oxide; and a source electrode and a drain electrode over the first insulating layer, wherein the gate electrode comprises; a first layer comprising a metal selected from Cr, Ta, Ti, Mo, and W; and a second layer comprising Cu. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47)
-
-
48. A display device comprising:
-
a gate electrode, the gate electrode comprising Cu; a first insulating layer over the gate electrode, the first insulating layer comprising silicon and nitrogen; a second insulating layer over the first insulating layer, the second insulating layer comprising silicon and oxygen; an oxide semiconductor layer over and in contact with the second insulating layer, the oxide semiconductor layer comprising indium, gallium, and zinc; a source electrode and a drain electrode over the oxide semiconductor layer, the source electrode and the drain electrode each comprising Cu; a third insulating layer over and in contact with the oxide semiconductor layer, the third insulating layer comprising silicon and oxygen; and a fourth insulating layer over the third insulating layer, the fourth insulating layer comprising silicon and nitrogen, wherein a superficial portion of the oxide semiconductor layer comprises a crystal region. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57)
-
Specification