Abstract
Perovskite solar cells single-doped with Br− or Cs+ ions have been proved to be an effective approach to improve their efficiency and stability. In our work, we took advantage of co-doping with Br− and Cs+. At our studied doping levels from CH3NH3I:PbI2:CsBr = 1:1:0 (x = 0) to 0.85:1:0.15 (x = 0.15), CsBr doping does not introduce any detectable impurity, and the crystal grains grow larger with increasing CsBr doping level. Furthermore, when the CsBr doping level is less than x = 0.1, it can progressively enhance the optical absorption of the perovskite film, although the absorption begins to decrease when the doping level rises above x = 0.1. X-ray photoelectron spectroscopy measurements show that Br− has successfully replaced I− and bonds with Pb2+ after CsBr doping. At the optimized doping level of x = 0.1, the incorporation of CsBr in the reaction system can improve the morphology of perovskite films and greatly enhance the efficiency from 9.8% for undoped sample to 13.6%, better than single Br− or Cs+ doping. Our result shows that CsBr doping is an effective method to enhance the efficiency of perovskite solar cells.
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This research was sponsored by the National Natural Science of China (Nos. 11674083, 51571083, 11305046).
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Zhang, LY., Zhang, Y., Guan, WB. et al. Large enhanced conversion efficiency of perovskite solar cells by CsBr doping. J Mater Sci 52, 13203–13211 (2017). https://doi.org/10.1007/s10853-017-1429-3
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DOI: https://doi.org/10.1007/s10853-017-1429-3