Method of producing epitaxial silicon wafer, epitaxial silicon wafer, and method of producing solid-state image sensing device
First Claim
1. A method of producing an epitaxial wafer comprising:
- a wafer production step of pulling a single crystal silicon ingot having a COP formation region by Czochralski process, and subjecting the obtained single crystal silicon ingot to slicing, thereby producing a silicon wafer including COPs;
a cluster ion irradiation step of irradiating the produced silicon wafer 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
an epitaxial layer formation step of forming an epitaxial layer on the modifying layer of the silicon wafer.
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Abstract
Provided is an epitaxial silicon wafer with reduced metal contamination achieved by higher gettering capability and a method of efficiently producing the same.
The method of producing an epitaxial wafer includes a wafer production step of pulling a single crystal silicon ingot having a COP formation region by Czochralski process, and subjecting the obtained single crystal silicon ingot to slicing, thereby producing a silicon wafer 10 including COPs; a cluster ion irradiation step of irradiating the produced silicon wafer 10 with cluster ions 16 to form a modifying layer 18 formed from a constituent element of the cluster ions 16, contained as a solid solution in a surface portion 10A of the silicon wafer 10; and an epitaxial layer formation step of forming an epitaxial layer 20 on the modifying layer 18 of the silicon wafer 10.
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Citations
12 Claims
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1. A method of producing an epitaxial wafer comprising:
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a wafer production step of pulling a single crystal silicon ingot having a COP formation region by Czochralski process, and subjecting the obtained single crystal silicon ingot to slicing, thereby producing a silicon wafer including COPs; a cluster ion irradiation step of irradiating the produced silicon wafer 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 an epitaxial layer formation step of forming an epitaxial layer on the modifying layer of the silicon wafer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification