Perovskite solar cells (PSCs) based on cesium (Cs)‐ and rubidium (Rb)‐containing perovskite films show highly reproducible performance; however, a fundamental understanding of these systems is still emerging. Herein, this study has systematically investigated the role of Cs and Rb cations in complete devices by examining the transport and recombination processes using current–voltage characteristics and impedance spectroscopy in the dark. As the credibility of these measurements depends on the performance of devices, this study has chosen two different PSCs, (MAFACs)Pb(IBr)₃ (MA = CH₃NH₃⁺, FA = CH(NH₂)₂⁺) and (MAFACsRb)Pb(IBr)₃, yielding impressive performances of 19.5% and 21.1%, respectively. From detailed studies, this study surmises that the confluence of the low trap‐assisted charge‐carrier recombination, low resistance offered to holes at the perovskite/2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamine)‐9,9‐spirobifluorene interface with a low series resistance (R_s), and low capacitance leads to the realization of higher performance when an extra Rb cation is incorporated into the absorber films. This study provides a thorough understanding of the impact of inorganic cations on the properties and performance of highly efficient devices, and also highlights new strategies to fabricate efficient multiple‐cation‐based PSCs.

中文翻译：

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in在基于多阳离子的高效钙钛矿太阳能电池中的作用

基于含铯（Cs）和rub（Rb）的钙钛矿薄膜的钙钛矿太阳能电池（PSC）显示出高度可复制的性能；但是，对这些系统的基本理解仍在不断涌现。在此，本研究通过在黑暗中使用电流-电压特性和阻抗谱检查传输和复合过程，系统地研究了Cs和Rb阳离子在完整器件中的作用。由于这些测量的可信度取决于设备的性能，因此本研究选择了两种不同的PSC，即（MAFAC）Pb（IBr）₃（MA = CH ₃ NH ₃ ⁺，FA = CH（NH ₂）₂ ⁺）和（ MAFACsRb）Pb（IBr）₃，分别产生了令人印象深刻的19.5％和21.1％的表现。从详细的研究，本研究推测该低陷阱辅助电荷载流子复合的汇合处，低电阻提供给在所述钙钛矿/ 2,2'的孔，7,7'-四（Ñ，ñ -二p -具有低串联电阻（R _s）和低电容的甲氧基苯胺）-9,9-螺二芴界面可在吸收剂薄膜中掺入额外的Rb阳离子时实现更高的性能。这项研究彻底了解了无机阳离子对高效设备的性能和性能的影响，并重点介绍了制造高效的基于多阳离子的PSC的新策略。