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Control the crystal size by varying concentrations of precursors for the planar perovskite solar cells

  • Xie, Lin (Department of Chemistry and Nano Science, Global Top 5 Research Program, EwhaWomans University) ;
  • Hwang, Heewon (Department of Chemistry and Nano Science, Global Top 5 Research Program, EwhaWomans University) ;
  • Kim, Minjung (Department of Chemistry and Nano Science, Global Top 5 Research Program, EwhaWomans University) ;
  • Kim, Kyungkon (Department of Chemistry and Nano Science, Global Top 5 Research Program, EwhaWomans University)
  • Received : 2015.12.09
  • Accepted : 2015.12.24
  • Published : 2015.12.31

Abstract

The influence of the grain size of the $CH_3NH_3PbI_3$ on the solar cell performance is investigated by controlling the ratio between $CH_3NH_3I$ and $PbI_2$ precursors. As the concentration of the precursors increased from 1.0M to 2.0M, the $CH_3NH_3PbI_3$ grain size increased from ~100nm to ~400nm. The solar cell utilizing the $CH_3NH_3PbI_3$ with large grain size shows improved photocurrent compared to the solar cell utilizing $CH_3NH_3PbI_3$ with small grain size, which is ascribed to the reduced recombination at the boundaries of grains.

Keywords

References

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