Oxide semiconductor film and semiconductor device
First Claim
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1. A semiconductor device comprising:
- a gate electrode layer;
an oxide semiconductor layer comprising a first region and a second region;
a gate insulating layer between the gate electrode layer and the oxide semiconductor layer;
a source electrode layer and a drain electrode layer electrically connected the oxide semiconductor layer; and
an oxide insulating layer in contact with the oxide semiconductor layer,wherein the oxide semiconductor layer is between the gate insulating layer and the oxide insulating layer,wherein the first region comprises crystals which are c-axis-oriented in a direction substantially perpendicular to a surface of the oxide semiconductor layer, andwherein the second region is an amorphous region or a region in which amorphousness and microcrystals are mixed.
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Abstract
It is an object to provide a highly reliable semiconductor device with good electrical characteristics and a display device including the semiconductor device as a switching element. In a transistor including an oxide semiconductor layer, a needle crystal group provided on at least one surface side of the oxide semiconductor layer grows in a c-axis direction perpendicular to the surface and includes an a-b plane parallel to the surface, and a portion except for the needle crystal group is an amorphous region or a region in which amorphousness and microcrystals are mixed. Accordingly, a highly reliable semiconductor device with good electrical characteristics can be formed.
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Citations
27 Claims
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1. A semiconductor device comprising:
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a gate electrode layer; an oxide semiconductor layer comprising a first region and a second region; a gate insulating layer between the gate electrode layer and the oxide semiconductor layer; a source electrode layer and a drain electrode layer electrically connected the oxide semiconductor layer; and an oxide insulating layer in contact with the oxide semiconductor layer, wherein the oxide semiconductor layer is between the gate insulating layer and the oxide insulating layer, wherein the first region comprises crystals which are c-axis-oriented in a direction substantially perpendicular to a surface of the oxide semiconductor layer, and wherein the second region is an amorphous region or a region in which amorphousness and microcrystals are mixed. - View Dependent Claims (2, 3, 4, 5)
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6. A semiconductor device comprising:
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a gate electrode layer over an insulating surface; a gate insulating layer over the gate electrode layer; an oxide semiconductor layer over the gate insulating layer; a source electrode layer and a drain electrode layer which overlap with part of the oxide semiconductor layer, and are over the gate insulating layer; and an oxide insulating layer in contact with the oxide semiconductor layer, over the source electrode layer and the drain electrode layer, wherein the oxide semiconductor layer includes a needle crystal group on at least one surface side, the needle crystal group growing in a c-axis direction perpendicular to the surface and having an a-b plane parallel to the surface, wherein a length of a needle crystal in the needle crystal group in the c-axis direction is greater than or equal to five times as long as a length in a direction of an a-axis or a b-axis, and wherein a region except for the needle crystal group is an amorphous region or a region in which amorphousness and microcrystals are mixed. - View Dependent Claims (7, 8, 9, 10)
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11. 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 comprising a first region and a second region and over the gate insulating layer; a source electrode layer and a drain electrode layer over the gate insulating layer and electrically connected to the oxide semiconductor layer; and an oxide insulating layer over the source electrode layer and the drain electrode layer, wherein the oxide insulating layer is in contact with the oxide semiconductor layer, wherein the first region comprises crystals which are c-axis-oriented in a direction substantially perpendicular to a surface of the oxide semiconductor layer, and wherein the second region includes microcrystals. - View Dependent Claims (12, 13, 14, 15)
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16. 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 comprising a channel formation region and over the gate insulating layer; a source electrode layer and a drain electrode layer over the oxide semiconductor layer; an oxide insulating layer over and in contact with the oxide semiconductor layer, the source electrode layer and the drain electrode layer; and a pixel electrode electrically connected to one of the source electrode layer and the drain electrode layer, wherein the channel formation region comprises crystals which are c-axis-oriented in a direction substantially perpendicular to a surface of the oxide semiconductor layer. - View Dependent Claims (17, 18, 19)
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20. 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 comprising a channel formation region and over the gate insulating layer; a source electrode layer and a drain electrode layer over the oxide semiconductor layer; a first insulating layer over and in contact with the oxide semiconductor layer, the source electrode layer and the drain electrode layer; a second insulating layer over the first insulating layer, a third insulating layer over the second insulating layer; and a pixel electrode over the third insulating layer, wherein the pixel electrode is electrically connected to one of the source electrode layer and the drain electrode layer, wherein the first insulating layer comprises silicon oxide, wherein the second insulating layer comprises silicon nitride, and wherein the third insulating layer comprises a resin, and wherein the channel formation region comprises crystals which are c-axis-oriented in a direction substantially perpendicular to a surface of the oxide semiconductor layer. - View Dependent Claims (21, 22, 23)
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24. 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 comprising a channel formation region and over the gate insulating layer; a source electrode layer and a drain electrode layer over the oxide semiconductor layer; an oxide insulating layer over the oxide semiconductor layer; and a pixel electrode electrically connected to one of the source electrode layer and the drain electrode layer, wherein each of the source electrode layer and the drain electrode layer comprises a conductive layer which comprises titanium, wherein the oxide semiconductor layer comprises a first region in contact with the oxide insulating layer and a second region in contact with the conductive layer, wherein resistance of the first region is higher than resistance of the second region, and wherein the channel formation region comprises crystals which are c-axis-oriented in a direction substantially perpendicular to a surface of the oxide semiconductor layer. - View Dependent Claims (25, 26, 27)
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Specification