Patent ID: 8993408
Filing Date: 2015-03-31
Classification: H01L,Y10T

Abstract:
1. A process for detaching a silicon thin film from a donor substrate by cleaving, said process comprising: implanting species within the donor substrate through a free surface to form a weak layer, the donor substrate being at least in part located below the free surface, said species being implanted at a depth at least equal to the thickness of the thin film to be detached; performing heat treatment at a temperature of at least 450° C.; and cleaving along the weak layer, wherein implanting species comprises implanting boron, helium and hydrogen in any order with implantation energies such that: helium and boron concentration maxima are obtained at substantially the same depth, separated by at most 10 nm; and a hydrogen concentration maximum is obtained at a depth at least 20 nm greater than that of the helium and boron concentration maxima, and with implantation doses such that: the boron dose is at least equal to 5×10 13 B/cm 2 ; and the total dose of helium and hydrogen is at least equal to 10 16 atoms/cm 2 and at most equal to 4×10 16 atoms/cm 2 .