Tutunjian & Bitetto, P.C.
Bandgap grading of CZTS solar cell
A method for fabricating a photovoltaic device includes forming a polycrystalline absorber layer including Cu—Zn—Sn—S(Se) (CZTSSe) over a substrate. The absorber layer is rapid thermal annealed in a sealed chamber having elemental sulfur within the chamber. A sulfur content profile is graded in the absorber layer in accordance with a size of the elemental sulfur and an anneal temperature to provide a graduated bandgap profile for the absorber layer. Additional layers are formed on the absorber layer to complete the photovoltaic device.
International Business Machines Corporation
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Jeehwan Yun Seog Marinus J. P. Talia S.
Kim Lee Hopstaken Gershon