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- W1968553617 abstract "Abstract The quaternary Cu2ZnSnS4 (CZTS) is a promising material for the thin-film solar cell applications. However, because CZTS is only stabilized in a very small chemical-potential region and the defect formation is much more complicated compared to the ternary systems, it requires careful control of the thin-film solar cell preparation. We have performed a density-functional theory investigation on the intrinsic defects, defect complexes and Na doping in this complicated system. Our calculations show that the disorder and nonstoichiometry in the Cu–Zn plane induces a bandgap shrinkage of the material. From our calculated results for various defects and the doping rules, we rationalize why the experiments obtain high conversion efficiencies for the thin-film solar cells under the Cu-poor and Zn-rich conditions. The most possible defects which fulfill the experimental Cu-poor and Zn-rich conditions are V Cu , rather than Zn Cu . It is necessary to keep the Sn chemical potential moderate during the CZTS thin-film solar cell growth because the Sn-involved defects and defect complexes are generally harmful. We also find that Na doping is expected to increase the conductivity and improves the conversion efficiency of CZTS solar cells. The present study provides valuable insights into the defect physics of the complicated CZTS system and a theoretical basis for exploring its practical applications as thin-film solar cell absorbers." @default.
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- W1968553617 date "2015-06-01" @default.
- W1968553617 modified "2023-10-16" @default.
- W1968553617 title "Intrinsic defects and Na doping in Cu2ZnSnS4: A density-functional theory study" @default.
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- W1968553617 doi "https://doi.org/10.1016/j.solener.2015.04.005" @default.
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