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<p>The past decade has witnessed the rapid increasement in power conversion efficiency (PCE) of perovskite solar cells (PSCs). However, ion migration in perovskite (PVK) layers severely hampers the improvement of device performance, despite encapsulation. Currently, reducing ion migration by rationally designing multifunctional additives and utilizing their functions such as coordination bonding, vacancy elimination, and interstitial filling remains a challenge. In this study, we used 2-(diphenylphosphino) ethylammonium tetrafluoroborate (DPEBF<sub>4</sub>) as a multifunctional additive to regulate the perovskite defects of PSCs, reduce ion migration and optimize carrier dynamics. The BF<sub>4</sub> anion in DPEBF<sub>4</sub> passivates the undercoordinated Pb<sup>2+</sup>. The DPE cation passivates negatively charged vacancy defects through hydrogen bonds and can passivate positively charged coordinated Pb<sup>2+</sup> and halide vacancy defects through coordination bonds. The strong terminal interactions promote the crystallization of the perovskite film and improve the film quality. In addition, DPEBF<sub>4</sub> can also optimize the energy level alignment of the device. As a result, through the introduction of DPEBF<sub>4</sub>, the device performance has been significantly improved. The PCE of the DPEBF<sub>4</sub>-treated device has increased from 24.56% to 25.87%, and the stability has been enhanced, maintaining 95% of the initial efficiency after 1000 h of continuous maximum power point tracking.</p>

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High efficiency and stable inverted perovskite solar cells enabled by a multifunctional organic salt additive

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Zhenhua Song,
  • Kexuan Sun,
  • Yuanyuan Meng,
  • Zewei Zhu,
  • Yaohua Wang,
  • Weifu Zhang,
  • Ruijia Tian,
  • Yang Bai,
  • Xiaoyi Lu,
  • Ming Yang,
  • Chang Liu,
  • Ziyi Ge

摘要

The past decade has witnessed the rapid increasement in power conversion efficiency (PCE) of perovskite solar cells (PSCs). However, ion migration in perovskite (PVK) layers severely hampers the improvement of device performance, despite encapsulation. Currently, reducing ion migration by rationally designing multifunctional additives and utilizing their functions such as coordination bonding, vacancy elimination, and interstitial filling remains a challenge. In this study, we used 2-(diphenylphosphino) ethylammonium tetrafluoroborate (DPEBF4) as a multifunctional additive to regulate the perovskite defects of PSCs, reduce ion migration and optimize carrier dynamics. The BF4 anion in DPEBF4 passivates the undercoordinated Pb2+. The DPE cation passivates negatively charged vacancy defects through hydrogen bonds and can passivate positively charged coordinated Pb2+ and halide vacancy defects through coordination bonds. The strong terminal interactions promote the crystallization of the perovskite film and improve the film quality. In addition, DPEBF4 can also optimize the energy level alignment of the device. As a result, through the introduction of DPEBF4, the device performance has been significantly improved. The PCE of the DPEBF4-treated device has increased from 24.56% to 25.87%, and the stability has been enhanced, maintaining 95% of the initial efficiency after 1000 h of continuous maximum power point tracking.