US Patent 7608522 Method for fabricating a hybrid orientation substrate

A method for fabricating a hybrid orientation substrate includes steps of providing a direct silicon bonding (DSB) wafer having a first substrate with (100) crystalline orientation and a second substrate with (110) crystalline orientation directly bonded on the first substrate, forming and patterning a first blocking layer on the second substrate to define a first region not covered by the first blocking layer and a second region covered by the first blocking layer, performing an amorphization process to transform the first region of the second substrate into an amorphized region, and performing an annealing process to recrystallize the amorphized region into the orientation of the first substrate and to make the second region stressed by the first blocking layer.