There is an urge to develop new hole-transporting materials (HTMs) for perovskite solar cells (PSCs), which can yield comparable power conversion efficiencies (PCEs) yet mitigate the issue of stability associated with the state-of-the-art HTM spiro-MeOTAD. Herein, we designed and prepared C_2v-symmetric spiro-configured HTM-1 comprising a central acridine–cyclopentadithiophene core unit flanked with triarylamine moieties. PSCs containing a 40 nm thin HTM-1 layer for hole extraction yielded a stabilized PCE approaching 21% under standard illumination. Owing to its higher hole mobility (μ_h) at low electric field, an impressive short-circuit current density (J_SC) of 24.7 mA cm^–2 and a high fill factor (FF) of 0.77 have been achieved. More importantly, HTM-1-based PSCs presented an excellent long-term operational stability under continuous illumination for 400 h and thermal stability at 80 °C, which can be ascribed to its high glass transition temperature of 168 °C and superior moisture tolerance. Arguably, the confluence of high performance and remarkable stability will lead to the development of technologically interesting new, stable, and efficient PSCs.

中文翻译：

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基于环戊二噻吩的高稳定钙钛矿太阳能电池空穴传输材料，其稳定效率接近21％

迫切需要开发一种用于钙钛矿太阳能电池（PSC）的新型空穴传输材料（HTM），该材料可以产生可比的功率转换效率（PCE），同时减轻与最新HTM螺线管相关的稳定性问题-MeOTAD。在这里，我们设计并制备了C _{2 v-}对称的螺环构型的HTM-1，它包含一个中央a啶-环戊_二噻吩核心单元，两侧是三芳基胺部分。包含40 nm HTM-1薄层用于孔提取的PSC在标准照明下产生的稳定PCE接近21％。由于其较高的空穴迁移率（μ _ħ在低电场），一个令人印象深刻的短路电流密度（Ĵ _SC）达到24.7 mA cm ^–2的高填充因子（FF）达到0.77。更重要的是，基于HTM-1的PSC在连续照明400小时和80°C的热稳定性下均具有出色的长期运行稳定性，这归因于其168°C的高玻璃化转变温度和出色的耐湿性。可以说，高性能和出色稳定性的融合将导致技术上有趣的新型，稳定和高效的PSC的发展。