Patent ID: 7141459
Filing Date: 2006-11-28
Classification: H01L

Abstract:
1. A method of forming a multiple-thickness semiconductor-on-insulator, comprising: providing a wafer, the wafer comprising a semiconductor film overlying a buried insulator layer overlying a substrate; the semiconductor film including at least two regions; masking the semiconductor film within the least one of the at least two regions to provide at least one semiconductor film masked portion having a first thickness, leaving exposed the semiconductor film within at least one of the at least two regions to provide at least one semiconductor film exposed portion having the first thickness; oxidizing at least a portion of the at least one exposed semiconductor film portion to provide at least one partially oxidized, exposed semiconductor film portion; and removing the oxidized portion of the exposed semiconductor film to leave a portion of the semiconductor film having a second thickness less than the first thickness to form the multiple-thickness semiconductor-on-insulator; masking at least a portion of the second thickness semiconductor film or the first thickness semiconductor film leaving exposed a portion of the other thickness semiconductor film; partially oxidizing the exposed portion of the other thickness semiconductor film; and removing the partially oxidized portion of the other thickness semiconductor film to form a portion of the other thickness semiconductor film having a third thickness that is different from the first and second thicknesses.