Patent ID: 7947571
Filing Date: 2011-05-24
Classification: H01L

Abstract:
1. A method for reducing Secco defects in a thinned transfer layer when fabricating a semiconductor on insulator substrate having a surface semiconductor layer, which comprises: providing a predetermined splitting area in a source substrate by implanting atomic species with a dose of between 1.9 and 2.3×10 attaching the source substrate to a handle substrate to form a source-handle component; detaching the transfer layer from the source substrate from the source-handle component at the predetermined splitting area to thereby transfer that layer from the source substrate to the handle substrate; and thinning the transfer layer at a temperature ranging between 850 and 875° C. and for a time of between several minutes and several hours, to reduce Secco defect density in the transfer layer by a factor of at least 5 as compared to thinned transfer layers formed at doses and temperatures not in the claimed ranges.