The photovoltaic performance of perovskite solar cells (PSCs) is closely dependent on the efficient carrier extraction and transport at the interface. Here, a polyaniline (PANI) functionalized MoO (PANI/MoO) hole transport material (HTM) is exploited to perfect the interface between the perovskite layer and carbon electrode in all-inorganic CsPbBr PSCs. After functionalization with PANI, the p-type behavior and the hole mobility and conductivity of MoO are improved by reducing the oxygen vacancies, which boosts the hole extraction and transport, energy level arrangement at the interface of CsPbBr perovskite/(PANI/MoO) HTM. Meanwhile, the PANI/MoO with rich C–N and N–H groups introduced by PANI passivates the ions trap states of perovskite films by the C–N⋯Pb (Cs) Lewis acid-base coordination and the N–H⋯Br hydrogen bonding, leading to an effective suppression of non-radiative recombination for improved carrier extraction. As a result, the PANI/MoO HTMs-based CsPbBr PSCs obtain a remarkably increased power conversion efficiency of 10.41 %, in comparison with the efficiency of the original device (6.55 %). In addition, the unencapsulated device with PANI/MoO HTMs shows excellent long-term stability with 93.9 % maintenance of the initial efficiency after storing in air with 85 % relative humidity and at 85 °C for 30 days.

中文翻译：

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通过聚苯胺功能化减少MoO3的氧空位，制备稳定高效的无机三溴钙钛矿太阳能电池


钙钛矿太阳能电池（PSC）的光伏性能密切依赖于界面处有效的载流子提取和传输。在这里，利用聚苯胺（PANI）功能化MoO（PANI/MoO）空穴传输材料（HTM）来完善全无机CsPbBr PSC中钙钛矿层和碳电极之间的界面。 PANI功能化后，通过减少氧空位，MoO的p型行为、空穴迁移率和电导率得到改善，从而促进了CsPbBr钙钛矿/(PANI/MoO) HTM界面的空穴提取和传输、能级排列。同时，PANI引入的富含C-N和N-H基团的PANI/MoO通过C-N⋯Pb(Cs)路易斯酸碱配位和N-H⋯Br氢钝化了钙钛矿薄膜的离子陷阱态键合，从而有效抑制非辐射复合，从而改善载流子提取。结果，与原始器件的效率（6.55％）相比，基于PANI/MoO HTM的CsPbBr PSC获得了10.41％的显着提高的功率转换效率。此外，采用PANI/MoO HTMs的未封装器件表现出优异的长期稳定性，在相对湿度85%的空气中和85°C下储存30天后，初始效率仍保持在93.9%。