Method of manufacturing thin film transistor with oxide semiconductor using sputtering method
First Claim
1. A method of manufacturing a semiconductor device, comprising:
- forming a gate electrode layer over a substrate having an insulating surface;
forming a gate insulating layer over the gate electrode layer;
forming a first oxide semiconductor layer including In and SiOx over the gate insulating layer by a sputtering method using a first oxide semiconductor target including SiO2 at 5 wt % or higher and 50 wt % or lower; and
forming a source region, a drain region, and a pixel electrode over the first oxide semiconductor layer by a sputtering method using a second oxide semiconductor target including In, Si and O,wherein the source region, the drain region, and the pixel electrode are formed from a second oxide semiconductor layer including In and O.
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Abstract
An object is to provide a semiconductor device provided with a thin film transistor having excellent electric characteristics using an oxide semiconductor layer. An In—Sn—O-based oxide semiconductor layer including SiOX is used for a channel formation region. In order to reduce contact resistance between the In—Sn—O-based oxide semiconductor layer including SiOX and a wiring layer formed from a metal material having low electric resistance, a source region or drain region is formed between a source electrode layer or drain electrode layer and the In—Sn—O-based oxide semiconductor layer including SiOX. The source region or drain region and a pixel region are formed using an In—Sn—O-based oxide semiconductor layer which does not include SiOX.
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Citations
14 Claims
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1. A method of manufacturing a semiconductor device, comprising:
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forming a gate electrode layer over a substrate having an insulating surface; forming a gate insulating layer over the gate electrode layer; forming a first oxide semiconductor layer including In and SiOx over the gate insulating layer by a sputtering method using a first oxide semiconductor target including SiO2 at 5 wt % or higher and 50 wt % or lower; and forming a source region, a drain region, and a pixel electrode over the first oxide semiconductor layer by a sputtering method using a second oxide semiconductor target including In, Si and O, wherein the source region, the drain region, and the pixel electrode are formed from a second oxide semiconductor layer including In and O. - View Dependent Claims (2, 13, 14)
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3. A method of manufacturing a semiconductor device, comprising:
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forming a gate electrode layer over a substrate having an insulating surface; forming a gate insulating layer over the gate electrode layer; forming a first oxide semiconductor layer including In over the gate insulating layer by a sputtering method using a first target including In and O; and forming a source region, a drain region, and a pixel electrode over the first oxide semiconductor layer by a sputtering method using a second target including In and O, wherein the source region, the drain region, and the pixel electrode are formed from a second oxide semiconductor layer including In, N, and O. - View Dependent Claims (4, 5, 6, 7)
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8. A method of manufacturing a semiconductor device, comprising:
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forming a gate electrode layer over a substrate having an insulating surface; forming a gate insulating layer over the gate electrode layer; forming a first oxide semiconductor layer including In and Si over the gate insulating layer by a sputtering method using a first target including In, Si, and O where a concentration of SiO2 is 5 wt % or higher and 50 wt % or lower; and forming a source region, a drain region, and a pixel electrode over the first oxide semiconductor layer by a sputtering method using a second target including In and O, wherein the source region, the drain region, and the pixel electrode are formed from a second oxide semiconductor layer including In and O. - View Dependent Claims (9, 10, 11, 12)
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Specification