Patent ID: 7713851

Claim:
A method of manufacturing a silicon epitaxial wafer comprising: a vapor phase growth step allowing a silicon epitaxial layer to grow in vapor phase on a silicon single crystal substrate manufactured by the Czochralski method, and doped with boron so as to adjust the resistivity to 0.02 Ω·cm or below; a low-temperature annealing step forming, following the vapor phase growth step, oxygen precipitation nuclei in the silicon single crystal substrate, by carrying out annealing at 450° C. to 750° C., both ends inclusive, in an oxidizing atmosphere for a duration of time allowing formation of a silicon oxide film only to as thick as 2 nm or below on the silicon epitaxial layer as a result of the annealing; and a cleaning step, as the first cleaning step after the low-temperature annealing step, etching the silicon oxide film formed in the low-temperature annealing step, using a cleaning solution composed of a mixed solution of ammonia, hydrogen peroxide and water, all of these steps being executed in this order, wherein a thickness of the silicon oxide film after the cleaning step is smaller than the thickness attained after the annealing step, and is adjusted to 1 nm or above.