Patent ID: 6140210
Filing Date: 2000-10-31
Classification: H01L

Abstract:
A method of fabricating an SOI wafer, comprising the steps of:forming an oxide film on the surface of at least one of two silicon wafers;implanting hydrogen ions or rare gas ions into the upper surface of one of the two silicon wafers in order to form a fine bubble layer (enclosed layer) within the wafer;superposing the ion-implanted silicon wafer on the other silicon wafer such that the ion-implanted surface comes into close contact with the surface of the other silicon wafer via the oxide film;performing heat treatment in order to delaminate a portion of the ion-implanted wafer, while the fine bubble layer is used as a delaminating plane, in order to form a thin film to thereby obtain an SOI wafer,wherein a defect layer at the delaminated surface of the thus-obtained SOI wafer is removed through vapor-phase etching.