The synthesis of Cu2Zn(GexSn1-x)Se 4 nanocrystals with tunable band gaps

Cu2Zn(Sn1-xGex)Se-4 (CZTGSe) nanocrystals with tunable band gaps have been synthesized via a hot-injection method. The band gaps of the nanocrystals were demonstrated to be linearly tuned from 1.33 to 1.63 eV by adjusting the composition parameter x of the Ge/(Ge + Sn) ratio from 0.0 to 1.0. This indicates that the tunable band gap CZTGSe can be a potential substitute for Cu2ZnSnSe4 (CZTSe) nanocrystal photovoltaic devices in the future.