Method of producing epitaxial silicon wafer, epitaxial silicon wafer, and method of producing solid-state image sensing device
First Claim
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1. A semiconductor epitaxial wafer, comprising:
- a silicon wafer free of dislocation clusters and COPs;
a modifying layer formed from a certain element contributing to gettering of heavy metal in a surface portion of the silicon wafer; and
an epitaxial layer on the modifying layer, wherein the full width half maximum of a concentration profile of the certain element in the depth direction of the modifying layer is 100 nm or less.
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Abstract
Provided is an epitaxial silicon wafer free of epitaxial defects caused by dislocation clusters and COPs with reduced metal contamination achieved by higher gettering capability and a method of producing the epitaxial wafer.
A method of producing an epitaxial silicon wafer includes a first step of irradiating a silicon wafer free of dislocation clusters and COPs with cluster ions to form a modifying layer formed from a constituent element of the cluster ions in a surface portion of the silicon wafer; and a second step of forming an epitaxial layer on the modifying layer of the silicon wafer.
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5 Claims
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1. A semiconductor epitaxial wafer, comprising:
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a silicon wafer free of dislocation clusters and COPs; a modifying layer formed from a certain element contributing to gettering of heavy metal in a surface portion of the silicon wafer; and an epitaxial layer on the modifying layer, wherein the full width half maximum of a concentration profile of the certain element in the depth direction of the modifying layer is 100 nm or less. - View Dependent Claims (2, 3, 4, 5)
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