SEMICONDUCTOR DEVICE, METHOD FOR MANUFACTURING THE SAME, AND ELECTRONIC DEVICE HAVING THE SAME
First Claim
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1. A semiconductor device comprising:
- a gate electrode layer;
a gate insulating layer over the gate electrode layer;
a plurality of oxide clusters over the gate insulating layer;
an oxide semiconductor layer over the gate insulating layer and the plurality of oxide clusters; and
source and drain electrode layers over the oxide semiconductor layer,wherein the plurality of oxide clusters have electrical conductivity,wherein the oxide semiconductor layer and the source electrode layer are electrically connected to each other, andwherein the oxide semiconductor layer and the drain electrode layer are electrically connected to each other.
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Abstract
In a thin film transistor including an oxide semiconductor, an oxide cluster having higher electrical conductance than the oxide semiconductor layer is formed between the oxide semiconductor layer and a gate insulating layer, whereby field effect mobility of the thin film transistor can be increased and increase of off current can be suppressed.
133 Citations
26 Claims
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1. A semiconductor device comprising:
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a gate electrode layer; a gate insulating layer over the gate electrode layer; a plurality of oxide clusters over the gate insulating layer; an oxide semiconductor layer over the gate insulating layer and the plurality of oxide clusters; and source and drain electrode layers over the oxide semiconductor layer, wherein the plurality of oxide clusters have electrical conductivity, wherein the oxide semiconductor layer and the source electrode layer are electrically connected to each other, and wherein the oxide semiconductor layer and the drain electrode layer are electrically connected to each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 25)
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10. A semiconductor device comprising:
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a gate electrode layer; a gate insulating layer over the gate electrode layer; a plurality of oxide clusters over the gate insulating layer; an oxide semiconductor layer over the gate insulating layer and the plurality of oxide clusters; a buffer layer having n-type electrical conductivity over the oxide semiconductor layer; and source and drain electrode layers over the buffer layer, wherein the plurality of oxide clusters have electrical conductivity, wherein a carrier concentration of the buffer layer is higher than a carrier concentration of the oxide semiconductor layer, wherein the oxide semiconductor layer and the source electrode layer are electrically connected to each other with the buffer layer interposed therebetween, and wherein the oxide semiconductor layer and the drain electrode layer are electrically connected to each other with the buffer layer interposed therebetween. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 26)
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19. A method for manufacturing a semiconductor device comprising:
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forming a gate electrode layer over a substrate; forming a gate insulating layer over the gate electrode layer; forming a plurality of oxide clusters having electrical conductivity over the gate insulating layer in a dispersed manner; forming an oxide semiconductor film over the gate insulating layer and the plurality of oxide clusters by a sputtering method; forming an island-like second oxide semiconductor film with an etching method of the oxide semiconductor film; forming a conductive layer over the island-like second oxide semiconductor film; and forming an oxide semiconductor layer and source and drain electrode layers with an etching method of the island-like second oxide semiconductor film and the conductive layer. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification