SEMICONDUCTOR SUBSTRATE AND METHOD OF MANUFACTURE THEREOF
First Claim
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1. A method of manufacturing a semiconductor wafer comprising:
- forming a heavily doped diffusion layer on a surface of a lightly doped semiconductor substrate that contains impurities at a low concentration, by carrying out a heat treatment in a gas atmosphere containing phosphorus, the heavily doped diffusion layer being higher in impurity concentration than the lightly doped semiconductor substrate; and
forming an epitaxial layer on a surface of the heavily doped diffusion layer, the epitaxial layer containing impurities at a lower concentration than the heavily doped diffusion layer.
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Abstract
A semiconductor substrate is disclosed, which comprises a lightly doped substrate that contains impurities at a low concentration, a heavily doped diffusion layer which is formed over a top of the lightly doped substrate and is higher in impurity concentration than the lightly doped substrate, and an epitaxial layer which is formed over a top of the heavily doped diffusion layer and contains impurities at a lower concentration than the heavily doped diffusion layer.
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18 Claims
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1. A method of manufacturing a semiconductor wafer comprising:
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forming a heavily doped diffusion layer on a surface of a lightly doped semiconductor substrate that contains impurities at a low concentration, by carrying out a heat treatment in a gas atmosphere containing phosphorus, the heavily doped diffusion layer being higher in impurity concentration than the lightly doped semiconductor substrate; and forming an epitaxial layer on a surface of the heavily doped diffusion layer, the epitaxial layer containing impurities at a lower concentration than the heavily doped diffusion layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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