Efficient Cu2ZnSn(Se,S)4 solar cells with 79% fill factor using two-step annealing
Solar Energy Materials and Solar Cells(2020)
摘要
CZTSeS absorbers were prepared by two-step annealing under Ar carried H2Se gas, namely, annealing holding at 400 °C then at 560 °C. The additional holding results in a more compact morphology, same microstructure of phases and higher emission energy of CZTSeS absorbers. The FF as high as 79% has been achieved by improving Rsh, together with the contributions of Rs as low as 0.1 Ω·cm2 and a ohmic contact. This work highlights great potential for sputtering processing based on quaternary target and demonstrates that fill factor of 79% can be experimentally achieved in CZTSeS solar cells.
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关键词
Kesterite solar cells,Fill factor,Two-step annealing,Quaternary target
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