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Chem. J. Chinese Universities

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Improvement of CsPbI3 Perovskite Solar Cell Performance by Small Molecules of Triphenylamine Containing Pyridine Groups

Lyu Haijun1, WANG Shenggang2, MA Jiazhuo2, HAO Yanzhong2#br#   

  1. 1. College of Chemical Engineering, Hebei University of Science and Technology 2. College of Science, Hebei University of Science and Technology
  • Received:2025-01-17 Revised:2025-04-29 Online First:2025-05-06 Published:2025-05-06
  • Contact: HAO Yan-Zhong E-mail:yzhao@hebust.edu.cn
  • Supported by:
    Supported by the Natural Science Foundation of Hebei Province, China(No.B2022208001)

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Abstract: In this paper, two novel small-molecule triphenylamine derivatives were synthesized with classic Suzuki-Miyaura and Ullmann coupling reactions. The synthesized compounds are N,N-bis (4-methoxyphenyl)-4-(4-pyridyl) aniline (H432) and N,N-bis(4-methoxyphenyl) -4-[4- (cyano)-3-pyridyl] aniline (H462). The small-molecule derivatives were deposited onto FTO/c-TiO2 /m-TiO2/CsPbI3 composite films to fabricate CsPbI3 perovskite solar cells with crystal modification and surface post-treatment modification. The resulting devices were characterized and tested with SEM, J-V curves, and electrochemical impedance spectroscopy. The results show that the CsPbI3 perovskite solar cells prepared with surface post-treatment modification exhibited a significant increase in power conversion efficiency (PCE). Specifically, the PCE of CsPbI3 perovskite solar cells modified with 0.05 mol/L H432 increased from 12.44% (control device) to 15.54%, while the PCE of those modified with 0.05 mol/L H462 improved from 12.44% to 15.66%.

Key words: CsPbI3 perovskite solar cells, Small-molecule triphenylamine derivatives, Interface modification, Power conversion efficiency

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