Semiconductor device and manufacturing method thereof
First Claim
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1. A method for manufacturing a semiconductor device comprising the steps of:
- forming a gate electrode over an insulating surface;
forming a gate insulating layer over the gate electrode;
forming a source region, a drain region, a first metal layer over the source region and a second metal layer over the drain region;
subjecting a top surface of the gate insulating layer which is exposed, a top surface of the first metal layer, and a top surface of the second metal layer, to a plasma treatment; and
forming a non-single-crystal oxide semiconductor layer over the gate insulating layer without exposure to air after the subjecting the gate insulating layer to the plasma treatment,wherein the non-single-crystal oxide semiconductor layer overlaps with the gate electrode, andwherein an oxygen concentration in the source region and the drain region is lower than an oxygen concentration in the non-single-crystal oxide semiconductor layer.
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Abstract
It is an object of the present invention to provide a thin film transistor in which an oxide semiconductor film containing indium (In), gallium (Ga), and zinc (Zn) is used and contact resistance of a source or a drain electrode layer is reduced, and a manufacturing method thereof. An IGZO layer is provided over the source electrode layer and the drain electrode layer, and source and drain regions having lower oxygen concentration than the IGZO semiconductor layer are intentionally provided between the source and drain electrode layers and the gate insulating layer, so that ohmic contact is made.
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Citations
14 Claims
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1. A method for manufacturing a semiconductor device comprising the steps of:
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forming a gate electrode over an insulating surface; forming a gate insulating layer over the gate electrode; forming a source region, a drain region, a first metal layer over the source region and a second metal layer over the drain region; subjecting a top surface of the gate insulating layer which is exposed, a top surface of the first metal layer, and a top surface of the second metal layer, to a plasma treatment; and forming a non-single-crystal oxide semiconductor layer over the gate insulating layer without exposure to air after the subjecting the gate insulating layer to the plasma treatment, wherein the non-single-crystal oxide semiconductor layer overlaps with the gate electrode, and wherein an oxygen concentration in the source region and the drain region is lower than an oxygen concentration in the non-single-crystal oxide semiconductor layer. - View Dependent Claims (2, 3, 4, 5)
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6. A method for manufacturing a semiconductor device comprising the steps of:
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forming a conductive layer over an insulating surface; etching the conductive layer to remove a part of the conductive layer; forming an insulating layer over the etched conductive layer; forming a first oxide semiconductor layer over the insulating layer; forming a metal layer over the first oxide semiconductor layer; etching the metal layer to remove a part of the metal layer; etching the first oxide semiconductor layer to remove a part of the first oxide semiconductor layer; subjecting a top surface of the insulating layer which is exposed and a top surface of the etched metal layer, to a plasma treatment; and forming a second oxide semiconductor layer over the insulating layer and the etched metal layer, wherein the second oxide semiconductor layer overlaps with the etched conductive layer, and wherein an oxygen concentration in the first oxide semiconductor layer is lower than an oxygen concentration in the second oxide semiconductor layer. - View Dependent Claims (7, 8, 9, 10)
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11. A method for manufacturing a semiconductor device comprising the steps of:
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forming a conductive layer over an insulating surface; etching the conductive layer to remove a part of the conductive layer; forming an insulating layer over the etched conductive layer; forming a first oxide semiconductor layer over the insulating layer; forming a metal layer over the first oxide semiconductor layer; etching the metal layer to remove a part of the metal layer; etching the first oxide semiconductor layer to remove a part of the first oxide semiconductor layer; subjecting a top surface of the insulating layer which is exposed and a top surface of the etched metal layer, to a plasma treatment by performing the plasma treatment using at least an oxygen gas; and forming a second oxide semiconductor layer over the insulating layer and the etched metal layer, wherein the second oxide semiconductor layer overlaps with the etched conductive layer. - View Dependent Claims (12, 13, 14)
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Specification