Patent ID: 8980732
Filing Date: 2015-03-17
Classification: H01L

Abstract:
1. A method for manufacturing a silicon carbide Schottky barrier diode, comprising: depositing an n− epitaxial layer on an n+ substrate; protecting a first portion of the n− epitaxial layer with a sacrificial oxide film layer; etching a second portion of the n− epitaxial layer that is not protected by the sacrificial oxide film; implanting nitrogen into the second portion of the n− epitaxial layer and the sacrificial oxide film; depositing silicon nitride on the nitrogen implanted n− epitaxial layer and the sacrificial oxide film; heat-oxidizing the silicon nitride to form a composite oxide film; removing the sacrificial oxide film after etching a first portion of the composite oxide film formed on the sacrificial oxide film; depositing a Schottky metal so as to be disposed to cover the first portion of the n− epitaxial layer and at least a portion of a second portion of the composite oxide film formed on the second portion of the n− epitaxial layer; and depositing a metal pad on top of the Schottky metal; wherein the depositing of the Schottky metal is performed after etching the sacrificial oxide film and the first portion of the composite oxide film on which the Schottky metal is to be deposited.