SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING SAME
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Accused Products
Abstract
This semiconductor device (100A) includes: a gate electrode (3); a gate insulating layer (4); an oxide layer (50) which is formed over the gate insulating layer (4) and which includes a semiconductor region (51) and a first conductor region (55) that contacts with the semiconductor region (51) and where the semiconductor region (51) at least partially overlaps with the gate electrode (3) with the gate insulating layer (4) interposed between them; a protective layer (8b) covering the upper surface of the semiconductor region (51); source and drain electrodes (6s, 6d) electrically connected to the semiconductor region (51); and a transparent electrode (9) arranged so as to overlap at least partially with the first conductor region (55) with a dielectric layer interposed between them. The drain electrode (6d) contacts with the first conductor region (55). When viewed along a normal to the substrate, an end portion of the protective layer (8b) is substantially aligned with an end portion of the drain, source or gate electrode (6d, 6s, 3), and at least a portion of a boundary between the semiconductor region (51) and the first conductor region (55) is substantially aligned with the end portion of the protective layer (8b).
14 Citations
38 Claims
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1-18. -18. (canceled)
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19. A semiconductor device comprising:
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a substrate; a gate electrode formed on the substrate; a gate insulating layer formed over the gate electrode; an oxide layer which is formed on the gate insulating layer and which includes a semiconductor region and a first conductor region that contacts with the semiconductor region and where the semiconductor region at least partially overlaps with the gate electrode with the gate insulating layer interposed between them; a protective layer covering the upper surface of the semiconductor region; source and drain electrodes electrically connected to the semiconductor region; and a transparent electrode arranged so as to overlap at least partially with the first conductor region with a dielectric layer interposed between them, wherein the drain electrode contacts with the first conductor region, and when viewed along a normal to the substrate, an end portion of the protective layer is substantially aligned with an end portion of the drain electrode, an end portion of the source electrode or an end portion of the gate electrode, and at least a portion of a boundary between the semiconductor region and the first conductor region is substantially aligned with the end portion of the protective layer. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 37, 38)
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29. A method for fabricating a semiconductor device, the method comprising the steps of:
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(A) providing a substrate having a gate electrode and a gate insulating layer formed thereon; (B) forming an oxide semiconductor layer over the gate insulating layer; (C) forming a resistance-lowering-processing mask on the oxide semiconductor layer so as to cover a portion of the oxide semiconductor layer, the portion being located over the gate electrode, the step (C) including the steps of; (C1) forming a resist film on the oxide semiconductor layer, and (C2) exposing the resist film to radiation from an opposite side of the surface of the substrate using the gate electrode as a mask, thereby forming a resist layer; and (D) lowering the resistance of a portion of the oxide semiconductor layer which is not covered with the resistance-lowering-processing mask to define a first conductor region, and turning the rest of the oxide semiconductor layer which has not had its resistance lowered into a semiconductor region, thereby forming an oxide layer including the semiconductor region and the first conductor region. - View Dependent Claims (30, 31, 36)
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32. A method for fabricating a semiconductor device, the method comprising the steps of:
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(a) providing a substrate having a gate electrode and a gate insulating layer formed thereon; (b) forming source and drain electrodes on the gate insulating layer; (c) forming an oxide semiconductor layer covering the source and drain electrodes; (d) forming a resistance-lowering-processing mask on the oxide semiconductor layer so as to cover at least a portion of the oxide semiconductor layer, the portion being located over the gate electrode, the step (d) including the steps of; (d1) forming a resist film on the oxide semiconductor layer, and (d2) exposing the resist film to radiation from an opposite side of the surface of the substrate using the gate electrode as a mask, thereby forming a resist layer; and (e) lowering the resistance of a portion of the oxide semiconductor layer which is not covered with the resistance-lowering-processing mask to define a first conductor region, and turning the rest of the oxide semiconductor layer which has not had its resistance lowered into a semiconductor region, thereby forming an oxide layer including the semiconductor region and the first conductor region. - View Dependent Claims (33, 34, 35)
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Specification