Semiconductor device including first and second gate electrodes and stack of insulating layers
First Claim
1. A semiconductor device comprising:
- a first gate electrode;
a gate insulating layer over the first gate electrode;
an oxide semiconductor layer over the gate insulating layer;
a first electrode layer and a second electrode layer in contact with the oxide semiconductor layer;
a first insulating layer over the first electrode layer and the second electrode layer;
a second insulating layer over the first insulating layer; and
a second gate electrode over the second insulating layer,wherein the first insulating layer is a resin layer, andwherein the second insulating layer comprises one compound selected from the group consisting of silicon nitride, silicon oxynitride, and silicon nitride oxide.
0 Assignments
0 Petitions
Accused Products
Abstract
The threshold voltage is shifted in a negative or positive direction in some cases by an unspecified factor in a manufacturing process of the thin film transistor. If the amount of shift from 0 V is large, driving voltage is increased, which results in an increase in power consumption of a semiconductor device. Thus, a resin layer having good flatness is formed as a first protective insulating film covering the oxide semiconductor layer, and then a second protective insulating film is formed by a sputtering method or a plasma CVD method under a low power condition over the resin layer. Further, in order to adjust the threshold voltage to a desired value, gate electrodes are provided over and below an oxide semiconductor layer.
-
Citations
27 Claims
-
1. A semiconductor device comprising:
-
a first gate electrode; a gate insulating layer over the first gate electrode; an oxide semiconductor layer over the gate insulating layer; a first electrode layer and a second electrode layer in contact with the oxide semiconductor layer; a first insulating layer over the first electrode layer and the second electrode layer; a second insulating layer over the first insulating layer; and a second gate electrode over the second insulating layer, wherein the first insulating layer is a resin layer, and wherein the second insulating layer comprises one compound selected from the group consisting of silicon nitride, silicon oxynitride, and silicon nitride oxide. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A semiconductor device comprising:
-
a first gate electrode; a gate insulating layer over the first gate electrode; an oxide semiconductor layer over the gate insulating layer; a first electrode layer and a second electrode layer in contact with the oxide semiconductor layer; a first insulating layer over the first electrode layer and the second electrode layer; a second insulating layer over the first insulating layer; and a second gate electrode over the second insulating layer, wherein the first insulating layer is a resin layer, wherein the second insulating layer comprises one compound selected from the group consisting of silicon nitride, silicon oxynitride, and silicon nitride oxide, and wherein both the first gate electrode and the second gate electrode extend beyond side edges of the oxide semiconductor layer in a channel width direction of the oxide semiconductor layer. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A semiconductor device comprising:
-
a first gate electrode; a second gate electrode; a first insulating layer over the first gate electrode and the second gate electrode; a first oxide semiconductor layer and a second oxide semiconductor layer over the first insulating layer; a first electrode layer and a second electrode layer in contact with the first oxide semiconductor layer, the second electrode layer being electrically connected to the second gate electrode; a second insulating layer over the first oxide semiconductor layer, the second oxide semiconductor layer, the first electrode layer, and the second electrode layer; a third insulating layer over the second insulating layer; a third gate electrode overlapping with the first oxide semiconductor layer with the third insulating layer interposed therebetween; and a fourth gate electrode overlapping with the second oxide semiconductor layer with the third insulating layer interposed therebetween, wherein the second insulating layer is a resin layer, wherein the third insulating layer comprises one compound selected from the group consisting of silicon nitride, silicon oxynitride, and silicon nitride oxide, and wherein both the first gate electrode and the third gate electrode extend beyond side edges of the first oxide semiconductor layer in a channel width direction of the first oxide semiconductor layer. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
-
Specification