Patent ID: 7479187

Claim:
A silicon epitaxial wafer manufacturing method in which a vapor phase growth of a silicon epitaxial layer is performed on a front surface of a silicon single crystal substrate which is subjected to a mirror polishing finished on a rear surface, while heating the silicon single crystal substrate introduced into a reaction chamber comprising: etching an inside of the reaction chamber with a hydrogen chloride gas to remove a silicon deposit deposited in the reaction chamber in a state that a silicon single crystal substrate is not introduced in the reaction chamber; thereafter performing a primary cooling in the reaction chamber; subsequently performing a secondary heating of an inside of the reaction chamber; subsequently performing a secondary cooling of the inside of the reaction chamber; and thereafter introducing a silicon single crystal substrate into the reaction chamber to perform the vapor phase growth; and forming a silicon thin film in the reaction chamber by introducing a silicon material gas in the reaction chamber after the etching, which is followed by the primary cooling, wherein the hydrogen chloride gas does not exist in the reaction chamber during both of the secondary heating and the secondary cooling.