Semiconductor device
First Claim
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1. A semiconductor device comprising:
- a light-receiving element comprising a first conductive region and a second conductive region;
a first transistor being provided over the light-receiving element with an insulating film provided therebetween, one of a source and a drain of the first transistor being electrically connected to one of the first conductive region and the second conductive region of the light-receiving element; and
a second transistor, a gate of the second transistor being electrically connected to the other of the source and the drain of the first transistor,wherein a channel formation region of the first transistor comprises an oxide semiconductor layer, andwherein one of the first conductive region and the second conductive region and the oxide semiconductor layer overlap with each other, and the other of the first conductive region and the second conductive region and the oxide semiconductor layer do not overlap with each other.
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Abstract
An object of the invention is to improve the accuracy of light detection in a photosensor, and to increase the light-receiving area of the photosensor. The photosensor includes: a light-receiving element which converts light into an electric signal; a first transistor which transfers the electric signal; and a second transistor which amplifies the electric signal. The light-receiving element includes a silicon semiconductor, and the first transistor includes an oxide semiconductor. The light-receiving element is a lateral junction photodiode, and an n-region or a p-region included in the light-receiving element overlaps with the first transistor.
129 Citations
21 Claims
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1. A semiconductor device comprising:
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a light-receiving element comprising a first conductive region and a second conductive region; a first transistor being provided over the light-receiving element with an insulating film provided therebetween, one of a source and a drain of the first transistor being electrically connected to one of the first conductive region and the second conductive region of the light-receiving element; and a second transistor, a gate of the second transistor being electrically connected to the other of the source and the drain of the first transistor, wherein a channel formation region of the first transistor comprises an oxide semiconductor layer, and wherein one of the first conductive region and the second conductive region and the oxide semiconductor layer overlap with each other, and the other of the first conductive region and the second conductive region and the oxide semiconductor layer do not overlap with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor device comprising:
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a light-receiving element comprising a first conductive region and a second conductive region; a first transistor being provided over the light-receiving element with an insulating film provided therebetween, one of a source and a drain of the first transistor being electrically connected to one of the first conductive region and the second conductive region of the light-receiving element; and a second transistor, a gate of the second transistor being electrically connected to the other of the source and the drain of the first transistor, wherein a channel formation region of the first transistor comprises an oxide semiconductor layer, wherein the first transistor is provided over the second transistor with the insulating film provided therebetween, and wherein one of the first conductive region and the second conductive region and the oxide semiconductor layer overlap with each other, and the other of the first conductive region and the second conductive region and the oxide semiconductor layer do not overlap with each other. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A semiconductor device comprising:
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a light-receiving element comprising an n-region and a p-region; a first transistor being provided over the light-receiving element with an insulating film provided therebetween, one of a source and a drain of the first transistor being electrically connected to one of the n-region and the p-region of the light-receiving element; and a second transistor, a gate of the second transistor being electrically connected to the other of the source and the drain of the first transistor, wherein a channel formation region of the first transistor comprises an oxide semiconductor layer, wherein the first transistor is provided over the second transistor with the insulating film provided therebetween, and wherein one of the n-region and the p-region and the oxide semiconductor layer overlap with each other, and the other of the n-region and the p-region and the oxide semiconductor layer do not overlap with each other. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification