Driver circuit with oxide semiconductor layers having varying hydrogen concentrations
First Claim
1. A semiconductor device comprising:
- a transistor comprising a first oxide semiconductor layer comprising a channel formation region, a source electrode, and a drain electrode; and
a passive element comprising a second oxide semiconductor layer electrically connected to one of the source electrode and the drain electrode,wherein a hydrogen concentration of the second oxide semiconductor layer is higher than a hydrogen concentration of the first oxide semiconductor layer.
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Accused Products
Abstract
The silicon nitride layer 910 formed by plasma CVD using a gas containing a hydrogen compound such as silane (SiH4) and ammonia (NH3) is provided on and in direct contact with the oxide semiconductor layer 905 used for the resistor 354, and the silicon nitride layer 910 is provided over the oxide semiconductor layer 906 used for the thin film transistor 355 with the silicon oxide layer 909 serving as a barrier layer interposed therebetween. Therefore, a higher concentration of hydrogen is introduced into the oxide semiconductor layer 905 than into the oxide semiconductor layer 906. As a result, the resistance of the oxide semiconductor layer 905 used for the resistor 354 is made lower than that of the oxide semiconductor layer 906 used for the thin film transistor 355.
208 Citations
29 Claims
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1. A semiconductor device comprising:
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a transistor comprising a first oxide semiconductor layer comprising a channel formation region, a source electrode, and a drain electrode; and a passive element comprising a second oxide semiconductor layer electrically connected to one of the source electrode and the drain electrode, wherein a hydrogen concentration of the second oxide semiconductor layer is higher than a hydrogen concentration of the first oxide semiconductor layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A semiconductor device comprising:
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a transistor comprising a first oxide semiconductor layer comprising a channel formation region, a source electrode, and a drain electrode; and a passive element comprising a second oxide semiconductor layer electrically connected to one of the source electrode and the drain electrode, wherein the first oxide semiconductor layer and the second oxide semiconductor layer are on a same surface, and wherein a hydrogen concentration of the second oxide semiconductor layer is higher than a hydrogen concentration of the first oxide semiconductor layer. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A semiconductor device comprising:
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a transistor comprising a first oxide semiconductor layer comprising a channel formation region; a passive element comprising a second oxide semiconductor layer; and a conductive layer, wherein the first oxide semiconductor layer and the second oxide semiconductor layer are on a same surface, wherein the first oxide semiconductor layer is electrically connected to the second oxide semiconductor layer through the conductive layer, and wherein the conductive layer is over the second oxide semiconductor layer, and wherein resistance of the second oxide semiconductor layer is lower than resistance of the first oxide semiconductor layer. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A semiconductor device comprising:
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a transistor comprising a first oxide semiconductor layer comprising a channel formation region, a source electrode, and a drain electrode; and a passive element comprising a second oxide semiconductor layer electrically connected to one of the source electrode and the drain electrode, wherein the first oxide semiconductor layer and the second oxide semiconductor layer comprise indium and zinc, wherein the first oxide semiconductor layer and the second oxide semiconductor layer are on a same surface, and wherein a hydrogen concentration of the second oxide semiconductor layer is higher than a hydrogen concentration of the first oxide semiconductor layer. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification