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    Bin-Jie Li, Jia-Wen Li, Gen-Jie Yang, Meng-Ge Wu, Jun-Sheng Yu. Improving efficiency of n–i–p perovskite solar cells enabled by 3-carboxyphenylboronic acid additiveJ. Chin. Phys. B, 2023, 32(10): 107801.
    Bin-Jie Li, Jia-Wen Li, Gen-Jie Yang, Meng-Ge Wu, Jun-Sheng Yu. Improving efficiency of n–i–p perovskite solar cells enabled by 3-carboxyphenylboronic acid additiveJ. Chin. Phys. B, 2023, 32(10): 107801.
  • Improving efficiency of n–i–p perovskite solar cells enabled by 3-carboxyphenylboronic acid additive

    • In the past period of time, perovskite solar cells have gained tremendous developments in improving photovoltaic performance, but they still face severe challenges. Defects in perovskite layers, especially at grain boundaries, severely limit the stabilization and efficiency of solar cells. In this work, we adopt 3-carboxyphenylboronic acid (CPBA) for modifying defects in perovskite thin films. Through the interaction among the carboxyl group, boronic acid and lead ions in the perovskite film, the crystallization effect of the perovskite molecular is greatly optimized. Moreover, the film defects are spontaneously passivated and the band gap is reduced, increasing the open circuit voltage and fill factor. Therefore, power conversion efficiency has been increased from 17.25% to 20.20%. This discovery provides a potential strategy for passivating the trap states in perovskite and enhancing the properties of devices.
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