Influence of compositional deviations on the properties of Cu2ZnSnSe4 monogram powders

摘要

We have investigated the influence of compositional deviations on the properties of Cu2ZnSnSe4 (CZTSe) monograin powders in order to determine the optimal preparation conditions for CZTSe based photovoltaic solar cells EDX results indicate that to obtain a single phase CZTSe powder the initial composition of precursors should be in the range of 0.83 < Cu/(Zn+Sn) < 1.0. If Cu/(Zn+Sn) ≥ 1.0 secondary phases were found by Raman investigations and identified as SnSe2 and Cu_xSe. The CZTSe grain resistance increased with decreasing the ratio of Cu/(Zn+Sn) and increasing the ratio of Zn/Sn. The shape of as-grown CZTSe powder crystals depends mostly on the mass ratio of flux/CZTSe. All Cu2ZnSnSe4 (CZTSe) monograins exhibited p-type conductivity.