Patent ID: 7300856
Filing Date: 2007-11-27
Classification: H01L

Abstract:
1. A process for detaching of two layers of semiconductor material along a weakened zone defined between the layers, which process comprises treating a structure that includes the two layers to an annealing phase wherein the temperature is brought to a transition value on the order of 430° C. to 450° C., followed by a thermal annealing of the structure by conducting at least one high temperature detachment annealing phase that ends at a temperature in the range of on the order of about 600° C. to on the order of about 800° C. in order to provide an improvement in surface roughness of detached surfaces compared to those surfaces obtained by a detachment annealing process that ends at a temperature of only about 500° C., wherein surface roughness of the detached surfaces is reduced significantly as measured by an average haze of the surfaces on the order of about 5 ppm.