Simultaneously Enhancing Efficiency and Stability of Perovskite Solar Cells Through Crystal Cross-Linking Using Fluorophenylboronic Acid,Small

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Simultaneously Enhancing Efficiency and Stability of Perovskite Solar Cells Through Crystal Cross-Linking Using Fluorophenylboronic Acid
Small ( IF 13.0 ) Pub Date : 2021-08-11 , DOI: 10.1002/smll.202102090
Mingguang Li ₁ , Huan Gao ₁ , Longsheng Yu ₁ , Senlin Tang ₁ , Ying Peng ₁ , Chao Zheng ₁ , Ligang Xu ₁ , Ye Tao ₁ , Runfeng Chen ₁ , Wei Huang _{1,

2}

Affiliation

Organic-inorganic metal halide perovskites are regarded as one of the most promising candidates in the photovoltaic field, but simultaneous realization of high efficiency and long-term stability is still challenging. Here, a one-step solution-processing strategy is demonstrated for preparing efficient and stable inverted methylammonium lead iodide (MAPbI₃) perovskite solar cells (PSCs) by incorporating a series of organic molecule dopants of fluorophenylboronic acids (F-PBAs) into perovskite films. Studies have shown that the F-PBA dopant acts as a cross-linker between neighboring perovskite grains through hydrogen bonds and coordination bonds between F-PBA and perovskite structures, yielding high-quality perovskite crystalline films with both improved crystallinity and reduced defect densities. Benefiting from the repaired grain boundaries of MAPbI₃ with the organic cross-linker, the inverted PSCs exhibit a remarkably enhanced performance from 16.4% to approximately 20%. Meanwhile, the F-PBA doped devices exhibit enhanced moisture/thermal/light stability, and specially retain 80% of their initial power conversion efficiencies after more than two weeks under AM 1.5G one-sun illumination. This work highlights the impressive advantages of the perovskite crystal cross-linking strategy using organic molecules with strong intermolecular interactions, providing an efficient route to prepare high-performance and stable planar PSCs.

中文翻译：

使用氟苯基硼酸通过晶体交联同时提高钙钛矿太阳能电池的效率和稳定性

有机-无机金属卤化物钙钛矿被认为是光伏领域最有前途的候选材料之一，但同时实现高效率和长期稳定性仍然具有挑战性。在这里，展示了一种一步溶液处理策略，用于制备高效稳定的倒甲基碘化铅（MAPbI ₃) 钙钛矿太阳能电池 (PSC) 通过将一系列氟苯基硼酸 (F-PBA) 有机分子掺杂剂掺入钙钛矿薄膜中。研究表明，F-PBA 掺杂剂通过 F-PBA 与钙钛矿结构之间的氢键和配位键充当相邻钙钛矿晶粒之间的交联剂，从而产生具有提高的结晶度和降低的缺陷密度的高质量钙钛矿晶体薄膜。受益于 MAPbI ₃修复的晶界使用有机交联剂后，倒置 PSC 的性能显着提高，从 16.4% 提高到约 20%。同时，F-PBA 掺杂器件表现出增强的湿/热/光稳定性，并且在 AM 1.5G 单日光照下超过两周后仍能保持其初始功率转换效率的 80%。这项工作突出了钙钛矿晶体交联策略使用具有强分子间相互作用的有机分子的显着优势，为制备高性能和稳定的平面 PSC 提供了有效途径。

更新日期：2021-09-23

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