Manufacturing method of semiconductor device
First Claim
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1. A manufacturing method of a semiconductor device, the method comprising:
- disposing a metal layer on an N surface of a nitride semiconductor substrate,wherein the disposing the metal layer includes a first process of forming the metal layer by sputtering at a film formation rate controlled to 4 nm/ minute or lower such that the metal layer is formed with flicking of carbon present on the N surface in a non-oxygen atmosphere and an Ar atmosphere; and
performing a wet etching on the N surface of the nitride semiconductor substrate, prior to the sputtering,wherein the N surface includes a nitrogen surface,wherein, in the nitride semiconductor substrate, the N surface is located on an opposite side of a surface that is arranged for epitaxial growth, andwherein the film formation rate is controlled by an applied voltage.
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Abstract
A technique of reducing the contact resistance between a semiconductor substrate and a metal layer is provided. A manufacturing method of a semiconductor device comprises a process of forming a metal layer on an N surface of a nitride semiconductor substrate. The process of forming the metal layer includes a first process of forming a metal layer by sputtering at a film formation rate controlled to 4 nm/minute or lower.
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22 Claims
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1. A manufacturing method of a semiconductor device, the method comprising:
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disposing a metal layer on an N surface of a nitride semiconductor substrate, wherein the disposing the metal layer includes a first process of forming the metal layer by sputtering at a film formation rate controlled to 4 nm/ minute or lower such that the metal layer is formed with flicking of carbon present on the N surface in a non-oxygen atmosphere and an Ar atmosphere; and performing a wet etching on the N surface of the nitride semiconductor substrate, prior to the sputtering, wherein the N surface includes a nitrogen surface, wherein, in the nitride semiconductor substrate, the N surface is located on an opposite side of a surface that is arranged for epitaxial growth, and wherein the film formation rate is controlled by an applied voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20, 21, 22)
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17. A manufacturing method of a semiconductor device, the method comprising:
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disposing a metal layer on an exposed N surface of a nitride semiconductor substrate, wherein the disposing the metal layer includes sputtering at a controlled film formation rate such that the metal layer is formed with flicking of carbon present on the N surface in a non-oxygen atmosphere and an Ar atmosphere; and performing a wet etching on the N surface of the nitride semiconductor substrate, prior to the sputtering, wherein the N surface includes a nitrogen surface, wherein, in the nitride semiconductor substrate, the N surface is located on an opposite side of a surface that is arranged for epitaxial growth, and wherein the film formation rate is controlled by an applied voltage. - View Dependent Claims (18, 19)
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Specification