Patent ID: 6368938
Filing Date: 2002-04-09
Classification: H01L

Abstract:
A process for manufacturing a silicon-on-insulator substrate and semiconductor devices on said substrate from silicon wafers comprising:providing a first silicon wafer thermal oxidizing of first silicon wafer in a dry ambient to obtain a thickness of the silicon dioxide layer 0.1 to 1 micrometer; implanting of hydrogen through a face side of said first wafer to a depth exceeeding a depth of the silicon dioxide layer to a dose in a range 5Ã—1016 to 2Ã—1017 cmâˆ’2; providing a second silicon wafer; activation of face surfaces of said first and second silicon wafers; initial bonding of faces of said wafers thus making a wafer assembly with bonding interface; separating of said assembly along a layer with a peak concentration of said implanted hydrogen and strenthening of said initially bonded interface by heating said assembly to a temperature less than 900Â° C. thus constituing a silicon-on-insulator wafer having a top silicon layer, silicon dioxide layer, and silicon substrate, and a leftover wafer; smoothing of surface of said silicon-on-insulator wafer comprising heating in hydrogen containing atmosphere to a temperature less than 900Â° C. forming of semiconductor devices in said top silicon layer of said silicon-on-insulator wafer provided that any thermal processing steps carried out at temperature 900Â° C. or less.