Semiconductor device comprising oxide semiconductor
First Claim
1. A semiconductor device comprising:
- a gate electrode layer;
a gate insulating layer over the gate electrode layer;
an oxide semiconductor layer over the gate electrode layer with the gate insulating layer therebetween, the oxide semiconductor layer comprising indium and zinc;
a first region over the oxide semiconductor layer;
a second region over the oxide semiconductor layer,a third region over the oxide semiconductor layer, wherein each of the first region, the second region and the third region comprises indium and zinc;
a first electrode layer on the first region; and
a second electrode layer on the second region,a third electrode layer on the third region between the first electrode layer and the second electrode layer,wherein the first electrode layer is electrically connected to a pixel electrode, andwherein the second electrode layer is electrically connected to a source line.
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Abstract
An object is to provide favorable interface characteristics of a thin film transistor including an oxide semiconductor layer without mixing of an impurity such as moisture. Another object is to provide a semiconductor device including a thin film transistor having excellent electric characteristics and high reliability, and a method by which a semiconductor device can be manufactured with high productivity. A main point is to perform oxygen radical treatment on a surface of a gate insulating layer. Accordingly, there is a peak of the oxygen concentration at an interface between the gate insulating layer and a semiconductor layer, and the oxygen concentration of the gate insulating layer has a concentration gradient. The oxygen concentration is increased toward the interface between the gate insulating layer and the semiconductor layer.
155 Citations
11 Claims
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1. A semiconductor device comprising:
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a gate electrode layer; a gate insulating layer over the gate electrode layer; an oxide semiconductor layer over the gate electrode layer with the gate insulating layer therebetween, the oxide semiconductor layer comprising indium and zinc; a first region over the oxide semiconductor layer; a second region over the oxide semiconductor layer, a third region over the oxide semiconductor layer, wherein each of the first region, the second region and the third region comprises indium and zinc; a first electrode layer on the first region; and a second electrode layer on the second region, a third electrode layer on the third region between the first electrode layer and the second electrode layer, wherein the first electrode layer is electrically connected to a pixel electrode, and wherein the second electrode layer is electrically connected to a source line. - View Dependent Claims (2, 3, 4, 5)
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6. A semiconductor device comprising:
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a gate electrode layer; a gate insulating layer over the gate electrode layer; an oxide semiconductor layer over the gate electrode layer with the gate insulating layer therebetween, the oxide semiconductor layer comprising indium and zinc; a first region over the oxide semiconductor layer; a second region over the oxide semiconductor layer, a third region over the oxide semiconductor layer, wherein each of the first region, the second region and third region comprises indium and zinc; a first electrode layer on the first region; and a second electrode layer on the second region, a third electrode layer on the third region between the first electrode layer and the second electrode layer, wherein the first electrode layer, the second electrode layer and the third electrode layer overlap with the gate electrode layer, wherein the first electrode layer is electrically connected to a pixel electrode, and wherein second electrode layer is electrically connected to a source line. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification