Investigating the solar cells efficiency of metal sulfide via first principle calculation

Abstract

ue to the large energy payback time of silicon solar cells there is a strong drive to develop new solar absorber materials for cost-effective and, ideally, highly-efficient solar cells. A number of metal sulfide materials have been found to have some desirable optical properties for this application, such as direct and sunlight-matched band gaps. Furthermore, many of these materials have the additional bene t over other solar cell technologies such as CdTe and CuInxGa1-xSe2 (CIGS) of containing only earth-abundant and non-toxic components. Cu2ZnSnS4 (CZTS) has received a great deal of scientific interest in recent years for this reason. With a direct band gap of 1.5 eV