Michael J. Chang, LLC
Achieving band gap grading of CZTS and CZTSe materials
Techniques for achieving band gap grading in CZTS/Se absorber materials are provided. In one aspect, a method for creating band gap grading in a CZTS/Se absorber layer includes the steps of: providing a reservoir material containing Si or Ge; forming the CZTS/Se absorber layer on the reservoir material; and annealing the reservoir material and the CZTS/Se absorber layer under conditions sufficient to diffuse Si or Ge atoms from the reservoir material into the CZTS/Se absorber layer with a concentration gradient to create band gap grading in the CZTS/Se absorber layer. A photovoltaic device and method of forming the photovoltaic device are also provided.
International Business Machines Corporation
H H H Y H H H H H H H H H H Y H H H H
H01L H01L H01L Y02P H01L H01L H01L H01L H01L H01L H01L H01L H01L H01L Y02E H01L H01L H01L H01L
inventional inventional inventional additional inventional inventional inventional inventional inventional inventional inventional inventional inventional inventional additional inventional inventional inventional inventional
Talia S. Yun Seog Richard A. Marinus
Gershon Lee Haight Hopstaken