Patent ID: 7052978
Filing Date: 2006-05-30
Classification: B23K,H01L

Abstract:
1. A method comprising: forming a cleave layer in a substrate, wherein the cleave layer comprises silicon-germanium (SiGe), and the substrate comprises silicon; impinging laser energy on the substrate; and effecting laser-induced cleaving along the cleave layer by performing at least one of: stoichiometrically adjusting a Ge content in a SiGe material to form the cleave layer in the substrate to match a bond breaking energy involving the SiGe material to a laser energy characterized by a laser wavelength; and selecting the laser wavelength to provide the laser energy to substantially match a bond-breaking threshold energy of the material, based upon at least a stoichiometric composition of the SiGe material of the cleave layer, wherein the laser wavelength is tuned to provide the laser energy to be greater than a band gap of SiGe and smaller than that of Si.