P-type sic epitaxial wafer and production method therefor
AssigneeShowa Denko K.K.
InventorsNaoto ISHIBASHI, Keisuke FUKADA, Akira BANDOH
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AssigneeShowa Denko K.K.
InventorsNaoto ISHIBASHI, Keisuke FUKADA, Akira BANDOH
Estimating the term…
A method of producing a p-type SiC epitaxial wafer, the method including: a step of setting an input raw material C/Si ratio, being a ratio between the C element and the Si element in a feedstock gas; and a step of obtaining a p-type SiC epitaxial wafer having an Al dopant concentration of at least 1×1018 cm−3 by forming a p-type SiC epitaxial film on a substrate in a film-forming atmosphere comprising the feedstock gas, a Cl-based gas containing Cl in the molecule, and a dopant gas containing Al and C in the molecule, wherein the input raw material C/Si ratio is set based on a total gas C/Si ratio, being a ratio between the C element and the Si element in the film-forming atmosphere containing the C element included in the dopant gas, the input raw material C/Si ratio differs from the total gas C/Si ratio, and the input raw material C/Si ratio is 0.8 or less.
A method of producing a p-type SiC epitaxial wafer having an Al dopant concentration of at least 1×1018 cm−3, the method comprising:
A p-type SiC epitaxial wafer having a dopant concentration of at least 1×1018 cm−3, and an in-plane uniformity of the dopant concentration of 25% or less.
Dependencies are inferred from the claim text.