Semiconductor device and method for manufacturing the same
First Claim
1. A semiconductor device comprising:
- a gate electrode over a substrate having an insulating surface;
a first insulating film over the gate electrode;
an oxide semiconductor layer over the first insulating film;
a second insulating film over the oxide semiconductor layer; and
a conductive film over the oxide semiconductor layer,wherein a thickness of the oxide semiconductor layer in a first region in which the oxide semiconductor layer and the conductive film are in contact with each other is smaller than a thickness of the oxide semiconductor layer in a second region in which the oxide semiconductor layer and the second insulating film are in contact with each other and overlap with at least part of the gate electrode, andwherein the conductive film is in contact with the first region of the oxide semiconductor layer and part of a top surface of the second insulating film.
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Abstract
In an active matrix display device, electric characteristics of thin film transistors included in a circuit are important, and performance of the display device depends on the electric characteristics. Thus, by using an oxide semiconductor film including In, Ga, and Zn for an inverted staggered thin film transistor, variation in electric characteristics of the thin film transistor can be reduced. Three layers of a gate insulating film, an oxide semiconductor layer and a channel protective layer are successively formed by a sputtering method without being exposed to air. Further, in the oxide semiconductor layer, the thickness of a region overlapping with the channel protective film is larger than that of a region in contact with a conductive film.
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Citations
55 Claims
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1. A semiconductor device comprising:
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a gate electrode over a substrate having an insulating surface; a first insulating film over the gate electrode; an oxide semiconductor layer over the first insulating film; a second insulating film over the oxide semiconductor layer; and a conductive film over the oxide semiconductor layer, wherein a thickness of the oxide semiconductor layer in a first region in which the oxide semiconductor layer and the conductive film are in contact with each other is smaller than a thickness of the oxide semiconductor layer in a second region in which the oxide semiconductor layer and the second insulating film are in contact with each other and overlap with at least part of the gate electrode, and wherein the conductive film is in contact with the first region of the oxide semiconductor layer and part of a top surface of the second insulating film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A semiconductor device comprising:
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a gate electrode over a substrate; a first insulating layer over the gate electrode, the first insulating layer comprising silicon nitride; a second insulating layer over the first insulating layer, the second insulating layer comprising silicon oxide; an oxide semiconductor layer comprising indium, over the gate electrode with the first insulating layer and the second insulating layer interposed therebetween; a source electrode and a drain electrode over the oxide semiconductor layer; a third insulating layer over top surfaces of the source and drain electrodes, the third insulating layer comprising silicon oxide; a fourth insulating layer over the third insulating layer, the fourth insulating layer comprising silicon nitride; a fifth insulating layer comprising an organic material over the fourth insulating layer; and a pixel electrode electrically connected to the source electrode or the drain electrode, wherein the pixel electrode is provided over the fifth insulating layer. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A semiconductor device comprising:
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a gate electrode over a substrate; a first insulating layer over the gate electrode, the first insulating layer comprising silicon nitride; a second insulating layer over the first insulating layer, the second insulating layer comprising silicon oxide; an oxide semiconductor layer comprising indium, over the gate electrode with the first insulating layer and the second insulating layer interposed therebetween; a source electrode and a drain electrode over the oxide semiconductor layer; a third insulating layer over top surfaces of the source and drain electrodes, the third insulating layer comprising silicon oxide; a fourth insulating layer over the third insulating layer, the fourth insulating layer comprising silicon nitride; a fifth insulating layer comprising an organic material over the fourth insulating layer; and a pixel electrode electrically connected to the source electrode or the drain electrode, wherein the gate electrode comprises copper, and wherein the pixel electrode is provided over the fifth insulating layer. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A semiconductor device comprising:
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a gate electrode over a substrate; a first insulating layer over the gate electrode, the first insulating layer comprising silicon nitride; a second insulating layer over the first insulating layer, the second insulating layer comprising silicon oxide; an oxide semiconductor layer comprising indium, over the gate electrode with the first insulating layer and the second insulating layer interposed therebetween; a third insulating layer on and in contact with the oxide semiconductor layer, the third insulating layer comprising silicon oxide; a source electrode and a drain electrode over the oxide semiconductor layer and the third insulating layer; a fourth insulating layer over the third insulating layer and the source and drain electrodes, the fourth insulating layer comprising silicon nitride; and a pixel electrode electrically connected to the source electrode or the drain electrode, wherein a thickness of the oxide semiconductor layer in a first region in which the oxide semiconductor layer and the source or drain electrode are in contact with each other is smaller than a thickness of the oxide semiconductor layer in a second region in which the oxide semiconductor layer and the third insulating layer are in contact with each other. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33)
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34. A semiconductor device comprising:
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a gate electrode over a substrate; a first insulating layer over the gate electrode, the first insulating layer comprising a silicon nitride layer; a second insulating layer over the first insulating layer, the second insulating layer comprising a silicon oxide layer; an oxide semiconductor layer comprising indium, over the gate electrode with the first insulating layer and the second insulating layer interposed therebetween; a third insulating layer on and in contact with the oxide semiconductor layer, the third insulating layer comprising a silicon oxide layer; a source electrode and a drain electrode over the oxide semiconductor layer and the third insulating layer; a fourth insulating layer over the third insulating layer and the source and drain electrodes, the fourth insulating layer comprising a silicon nitride layer; and a pixel electrode electrically connected to the source electrode or the drain electrode, wherein the gate electrode comprises copper, and wherein a thickness of the oxide semiconductor layer in a first region in which the oxide semiconductor layer and the source or drain electrode are in contact with each other is smaller than a thickness of the oxide semiconductor layer in a second region in which the oxide semiconductor layer and the third insulating layer are in contact with each other. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41)
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42. A semiconductor device comprising:
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a gate electrode over a substrate; an oxide semiconductor layer comprising indium, a first insulating layer and a second insulating layer between the gate electrode and the oxide semiconductor layer; a third insulating layer and a fourth insulating layer adjacent to the oxide semiconductor layer, a fifth insulating layer comprising an organic material over the gate electrode, the oxide semiconductor layer, and the first insulating layer to the fourth insulating layer; and a pixel electrode over the fifth insulating layer, wherein the second insulating layer is provided between the gate electrode and the first insulating layer, wherein the third insulating layer is provided between the oxide semiconductor layer and the fourth insulating layer; wherein the oxide semiconductor layer is provided between the first insulating layer and the third insulating layer; wherein the first insulating layer is in direct contact with the third insulating layer; wherein each of the first insulating layer and the third insulating layer comprises silicon oxide; and wherein each of the second insulating layer and the fourth insulating layer comprises silicon nitride. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49)
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50. A semiconductor device comprising:
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a gate electrode over a substrate having an insulating surface; a first insulating film over the gate electrode; an oxide semiconductor layer over the first insulating film; a second insulating film over the oxide semiconductor layer; and a metal film over the oxide semiconductor layer, wherein a thickness of the oxide semiconductor layer in a first region in which the oxide semiconductor layer and the metal film are in contact with each other is smaller than a thickness of the oxide semiconductor layer in a second region in which the oxide semiconductor layer and the second insulating film are in contact with each other and overlap with at least part of the gate electrode, and wherein the metal film is in contact with the first region of the oxide semiconductor layer and part of a top surface of the second insulating film. - View Dependent Claims (51, 52, 53, 54, 55)
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Specification