The intrinsic stability issues of the perovskite materials threaten the efficiency and stability of the devices, and stability has become the main obstacle to industrial applications. Herein, the efficient and facile passivation strategy by 2-amino-5-iodobenzoic acid (AIBA) is proposed. The impact of AIBA on the properties of the perovskite films and device performance is systemically studied. The results show that the trap states are eliminated without affecting the crystal properties of the perovskite grains, leading to the enhanced performance and stability of the perovskite solar cells (PSCs). A high power conversion efficiency (PCE) of 20.23% and lower hysteresis index (HI) of 1.49‰ are achieved, which represent one of the most excellent PCE and HI values for the inverted PSCs based on MAPbI₃/[6,6]-Phenyl-C61-Butyric Acid Methyl Ester (PCBM) planar heterojunction structure. Moreover, the UV stability of the perovskite films and the thermal and moisture stability of the devices are also enhanced by the AIBA passivation. The PCE of the device with AIBA can maintain about 83.41% for 600 h (40 RH %) and 64.06% for 100 h (55–70 RH %) of its initial PCE value without any encapsulation, while the control device can maintain only about 72.91 and 45.59% of its initial PCE. Density functional theory calculations are performed to study the origins of enhanced performance. Interestingly, the results show that the surface states induced by AIBA can facilitate the photoexcited charge transfer dynamics and reduce the electron–hole recombination loss. The passivation method developed in this work provides an efficient way to enhance the stability and performance of inverted PSCs.

中文翻译：

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通过 2-氨基-5-碘苯甲酸钝化增强钙钛矿太阳能电池性能

钙钛矿材料固有的稳定性问题威胁着器件的效率和稳定性，稳定性已成为工业应用的主要障碍。在此，提出了一种高效、简便的 2-氨基-5-碘苯甲酸 (AIBA) 钝化策略。系统研究了AIBA对钙钛矿薄膜性能和器件性能的影响。结果表明，陷阱态被消除而不影响钙钛矿晶粒的晶体性质，从而提高了钙钛矿太阳能电池（PSC）的性能和稳定性。实现了 20.23% 的高功率转换效率 (PCE) 和 1.49‰ 的较低滞后指数 (HI)，这代表了基于 MAPbI _{3的倒置 PSC 的最出色的 PCE 和 HI 值之一}/[6,6]-苯基-C61-丁酸甲酯 (PCBM) 平面异质结结构。此外，AIBA 钝化还增强了钙钛矿薄膜的紫外线稳定性以及器件的热稳定性和湿度稳定性。带有AIBA的装置的PCE在600小时（40 RH %）和100小时（55-70 RH %）的初始PCE值可以保持约83.41%，而无需任何封装，而控制装置只能保持约其初始 PCE 的 72.91 和 45.59%。进行密度泛函理论计算以研究增强性能的起源。有趣的是，结果表明AIBA诱导的表面态可以促进光激发电荷转移动力学并减少电子-空穴复合损失。