Method of manufacturing a zinc oxide (ZnO) based semiconductor device including performing a heat treatment of a contact metal layer on a p-type ZnO semiconductor layer in a reductive gas atmosphere
First Claim
1. A method for forming a contact electrode for a p-type ZnO-based semiconductor, comprising:
- (A) forming a doped p-type MgxZn(1-x)O layer, wherein 0<
x<
0.43, as an uppermost layer of the p-type ZnO-based semiconductor layer;
(B) forming a contact metal layer on the doped p-type MgxZn(1-x)O layer to form a first p-electrode layer, wherein the contact metal layer contains at least one of Ni and Cu, and has a thickness of 60 nm or less;
(C) forming a barrier metal layer directly on the contact metal layer to form a second p-electrode layer;
(D) forming a pad metal layer on the barrier metal layer to form a third p-electrode layer; and
(E) performing a heat treatment, after steps (B), to form a mixture region of the doped p-type MgxZn(1-x)O layer and the contact metal layer, wherein the heat treatment is performed under a reductive gas atmosphere containing H2 and at a temperature in the range of 350 to 450°
C. to change the contact metal layer into an oxide layer at the interface of the contact metal layer and the doped p-type MgxZn(1-x)O layer, while maintaining a metal phase layer of the contact metal layer on the side of the second p-electrode layer.
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Abstract
Disclosed is a method of manufacturing a ZnO-based semiconductor device having at least p-type ZnO-based semiconductor layer, which includes a step of forming a contact metal layer on the p-type ZnO-based semiconductor layer wherein the contact metal layer contains at least one of Ni and Cu; and a step of performing heat treatment of the contact metal layer and the p-type ZnO-based semiconductor layer under an oxygen-free atmosphere to form a mixture layer including elements of the p-type ZnO-based semiconductor layer and the contact metal layer at a boundary region therebetween while maintaining a metal phase layer on a surface of the contact metal layer.
7 Citations
16 Claims
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1. A method for forming a contact electrode for a p-type ZnO-based semiconductor, comprising:
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(A) forming a doped p-type MgxZn(1-x)O layer, wherein 0<
x<
0.43, as an uppermost layer of the p-type ZnO-based semiconductor layer;(B) forming a contact metal layer on the doped p-type MgxZn(1-x)O layer to form a first p-electrode layer, wherein the contact metal layer contains at least one of Ni and Cu, and has a thickness of 60 nm or less; (C) forming a barrier metal layer directly on the contact metal layer to form a second p-electrode layer; (D) forming a pad metal layer on the barrier metal layer to form a third p-electrode layer; and (E) performing a heat treatment, after steps (B), to form a mixture region of the doped p-type MgxZn(1-x)O layer and the contact metal layer, wherein the heat treatment is performed under a reductive gas atmosphere containing H2 and at a temperature in the range of 350 to 450°
C. to change the contact metal layer into an oxide layer at the interface of the contact metal layer and the doped p-type MgxZn(1-x)O layer, while maintaining a metal phase layer of the contact metal layer on the side of the second p-electrode layer.
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2. A method of manufacturing a zinc oxide (ZnO) based semiconductor device comprising a p-type ZnO-based semiconductor layer, comprising:
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(A) forming a doped p-type MgxZn(1-x)O layer, wherein 0≦
x<
0.43, as an uppermost layer of the p-type ZnO-based semiconductor layer;(B) forming a contact metal layer on the doped p-type MgxZn(1-x)O layer to form a first p-electrode layer, wherein the contact metal layer contains at least one of nickel (Ni) and copper (Cu), and has a thickness of 60 nm or less; (C) forming a barrier metal layer directly on the contact metal layer to form a second p-electrode layer; (D) forming a pad metal layer on the barrier metal layer to from a third p-electrode layer; and (E) performing a heat treatment, after steps (B), (C) or (D), to form a mixture region of the doped p-type MgxZn(1-x)O layer and the contact metal layer, wherein the heat treatment is performed under a reductive gas atmosphere containing H2 and at a temperature in the range of 350 to 450°
C. to change the contact metal layer into an oxide layer at the interface of the contact metal layer and the doped p-type MgxZn(1-x)O layer, while maintaining a metal phase layer of the contact metal layer on the side of the second p-electrode layer. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification