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Surface grain boundary passivation via mixed antisolvent and PC61BM assistant for stable perovskite solar cells

  • Hanying Mao
  • Yuelong HuangEmail author
  • Zhu MaEmail author
  • Lifen Jin
  • Liuwen Tian
  • Yuepeng Li
  • Hua Yu
  • Changtao Peng
Article
  • 25 Downloads

Abstract

Perovskite solar cells (PSCs) have attracted intense research interest in the last few years due to their excellent properties. However, the trap states at grain boundary (GBs) of perovskite films lead to charge recombination and perovskite film decomposition, which deteriorate the stability of PSCs. It has been demonstrated that the GBs passivation is an effective way to eliminate trap states and enhance the stability of PSCs. In this work, ethyl acetate (EA) and chlorobenzene (CB) were used as anti-solvent, mixing with phenyl-C61-butyric acid methyl ester (PC61BM) to replace pure antisolvent CB to control the GBs passivation of perovskite film. Meanwhile, enhanced interfacial hydrophobic characteristic effectively restricted the penetration of moisture. Correspondingly, with optimizing the volume ratio of EA/CB, the power conversion efficiency of PSCs based on CH3NH3PbI3 increased from 14.4 to 16.1% and the stability is greatly improved. This shows the adoption of a mixed solvent for EA and CB contained PC61BM as the solute can be used as an efficient tactic to passivate the surface crystal boundary, improve charge carrier transportation and device performance.

Notes

Acknowledgements

The authors gratefully acknowledge the financial support from Sichuan Science and Technology Program (Grant No. 2018JY0015), Young scholars development fund of SWPU (Grant No. 201699010017) and scientific research starting project of SWPU (Grant No. 2017QHZ021).

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of PhotovoltaicSouthwest Petroleum UniversityChengduPeople’s Republic of China

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