Patent ID: 8691662
Filing Date: 2014-04-08
Classification: H01L

Abstract:
1. A method for fabricating a silicon-on-insulator structure, comprising: forming a first oxide layer on a silicon donor substrate; forming a second oxide layer on a supporting substrate; forming a weakened zone in the donor substrate; bonding the donor substrate to the supporting substrate by establishing direct contact between the first oxide layer on the silicon donor substrate and the second oxide layer on the supporting substrate and establishing a direct oxide-to-oxide bond therebetween, the bonded first oxide layer and second oxide layer together forming a buried oxide layer of the silicon-on-insulator structure having a thickness of about 50 nm or less; splitting the donor substrate along the weakened zone to form a silicon-on-insulator structure; and after splitting the donor substrate along the weakened zone; subjecting the silicon-on-insulator structure to two successive rapid thermal annealing processes including a first rapid thermal annealing process performed at a first temperature T1 and a second rapid thermal annealing process performed at a second temperature T2, wherein: