Method for manufacturing semiconductor device
First Claim
1. A method for manufacturing a transistor comprising an oxide semiconductor layer, at least one of a source electrode and a drain electrode electrically connected to the oxide semiconductor layer, a gallium oxide layer, a gate electrode, and a protective insulating film, the method comprising the steps of:
- forming the one of the source electrode and the drain electrode over the oxide semiconductor layer;
forming the gallium oxide layer over the one of the source electrode and the drain electrode, the gallium oxide layer being on and in contact with the oxide semiconductor layer;
forming the gate electrode over the gallium oxide layer;
forming the protective insulating film over the gallium oxide layer and the gate electrode;
forming a resist mask over the protective insulating film; and
forming a contact hole by dry etching the protective insulating film and the gallium oxide layer using the resist mask,wherein a width of the contact hole in the gallium oxide layer is smaller than a width of the contact hole in the protective insulating film, andwherein the contact hole includes a stepped shape.
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Accused Products
Abstract
An object is to provide a method for manufacturing a semiconductor device including an oxide semiconductor and having improved electric characteristics. The semiconductor device includes an oxide semiconductor film, a gate electrode overlapping the oxide semiconductor film, and a source electrode and a drain electrode electrically connected to the oxide semiconductor film. The method includes the steps of forming a first insulating film including gallium oxide over and in contact with the oxide semiconductor film; forming a second insulating film over and in contact with the first insulating film; forming a resist mask over the second insulating film; forming a contact hole by performing dry etching on the first insulating film and the second insulating film; removing the resist mask by ashing using oxygen plasma; and forming a wiring electrically connected to at least one of the gate electrode, the source electrode, and the drain electrode through the contact hole.
134 Citations
13 Claims
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1. A method for manufacturing a transistor comprising an oxide semiconductor layer, at least one of a source electrode and a drain electrode electrically connected to the oxide semiconductor layer, a gallium oxide layer, a gate electrode, and a protective insulating film, the method comprising the steps of:
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forming the one of the source electrode and the drain electrode over the oxide semiconductor layer; forming the gallium oxide layer over the one of the source electrode and the drain electrode, the gallium oxide layer being on and in contact with the oxide semiconductor layer; forming the gate electrode over the gallium oxide layer; forming the protective insulating film over the gallium oxide layer and the gate electrode; forming a resist mask over the protective insulating film; and forming a contact hole by dry etching the protective insulating film and the gallium oxide layer using the resist mask, wherein a width of the contact hole in the gallium oxide layer is smaller than a width of the contact hole in the protective insulating film, and wherein the contact hole includes a stepped shape. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for manufacturing a transistor comprising the steps of:
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forming an oxide semiconductor layer comprising a channel formation region over an insulating surface, the oxide semiconductor layer comprising indium and zinc; forming a source electrode and a drain electrode over the oxide semiconductor layer; forming a gallium oxide layer over and in contact with the source electrode, the drain electrode and the channel formation region; forming a gate insulating layer over the gallium oxide layer; forming a gate electrode over the gate insulating layer; forming an insulating film over the gate electrode; forming a contact hole over the insulating film; and forming a conductive layer in the contact hole. - View Dependent Claims (10, 11, 12, 13)
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Specification