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Large enhanced conversion efficiency of perovskite solar cells by CsBr doping

Journal Article


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 CH 3 NH 3 I:PbI 2 :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 Pb 2+ 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.

UOW Authors


  •   Zhang, Li-Ying (external author)
  •   Zhang, Yong (external author)
  •   Guan, Wei-Bao (external author)
  •   Wang, Ke-Fan (external author)
  •   Cheng, Zhenxiang
  •   Wang, Yuan Xu (external author)

Publication Date


  • 2017

Citation


  • Zhang, L., Zhang, Y., Guan, W., Wang, K., Cheng, Z. & Wang, Y. (2017). Large enhanced conversion efficiency of perovskite solar cells by CsBr doping. Journal of Materials Science, 1-9.

Scopus Eid


  • 2-s2.0-85026541255

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2668

Number Of Pages


  • 8

Start Page


  • 1

End Page


  • 9

Place Of Publication


  • United States

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 CH 3 NH 3 I:PbI 2 :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 Pb 2+ 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.

UOW Authors


  •   Zhang, Li-Ying (external author)
  •   Zhang, Yong (external author)
  •   Guan, Wei-Bao (external author)
  •   Wang, Ke-Fan (external author)
  •   Cheng, Zhenxiang
  •   Wang, Yuan Xu (external author)

Publication Date


  • 2017

Citation


  • Zhang, L., Zhang, Y., Guan, W., Wang, K., Cheng, Z. & Wang, Y. (2017). Large enhanced conversion efficiency of perovskite solar cells by CsBr doping. Journal of Materials Science, 1-9.

Scopus Eid


  • 2-s2.0-85026541255

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2668

Number Of Pages


  • 8

Start Page


  • 1

End Page


  • 9

Place Of Publication


  • United States