Patent ID: 7993452

Claim:
A method of manufacturing a silicon wafer comprising the steps of: cleaning a silicon wafer with top and bottom faces processed to a mirror finish; and conducting a rapid thermal process (RTP) or an epitaxial growth process, wherein the cleaning step comprises: dipping the silicon wafer in an aqueous ozone solution; dipping the silicon wafer in hydrofluoric acid; dipping the silicon wafer in another aqueous ozone solution; processing only a bottom surface of the silicon wafer with dilute hydrofluoric acid (HF); and subsequently processing only the bottom surface of the silicon wafer with pure water (DIW) by showering the pure water on the bottom surface, wherein: the foregoing steps are conducted in the foregoing order; and the processing of only a bottom surface of the silicon wafer with dilute hydrofluoric acid (HF) and the subsequent processing of only the bottom surface of the silicon wafer with pure water (DIW) are conducted in a last stage of the cleaning step.