Quasi‐2D perovskites with excellent stability have been recognized as an alternative to 3D counterparts for perovskite solar cells (PSCs). Although the power conversion efficiency (PCE) of quasi‐2D PSCs has increased over 18% by the compositional controlling and solvent engineering of perovskites, fewer studies have been conducted to exploit charge transport layers and investigate their interface relationships with quasi‐2D perovskites. To achieve high efficiency and good long‐term stability for quasi‐2D PSCs, hole‐transporting materials (HTMs) with matched energy levels and good chemical compatibility with quasi‐2D perovskites are explored and investigated. Herein, a novel non‐conjugated polymer based on polyethylene backbone, poly[3,6‐(4,4′‐dimethoxytriphenylamino)‐9‐vinyl‐9H‐carbazole] (PVCz‐OMeTPA), is easily synthesized and investigated as a promising dopant‐free HTM for quasi‐2D PSCs. Due to its more suitable energy levels, good hole mobility, as well as excellent film‐forming ability to assist the formation of high‐quality quasi‐2D perovskite films, the optimized p–i–n structured quasi‐2D PSCs based on PVCz‐OMeTPA exhibit the best PCE of 17.22%. The unencapsulated quasi‐2D PSCs based on PVCz‐OMeTPA maintain 82% of the initial efficiency after 1400 h under a relative humidity of ≈40% and sustain over 81% of the original efficiency after aging for 600 h upon 70 °C of continuous annealing.

中文翻译：

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基于聚乙烯骨干的无共轭聚合物作为无掺杂空穴传输材料，用于高效稳定地转换准二维钙钛矿型太阳能电池

具有出色稳定性的准2D钙钛矿被公认为是钙钛矿太阳能电池（PSC）的3D替代品。尽管通过钙钛矿的成分控制和溶剂工程使准2D PSC的功率转换效率（PCE）提高了18％以上，但为开发电荷传输层并研究其与准2D钙钛矿的界面关系所做的研究很少。为了实现准2D PSC的高效率和良好的长期稳定性，对能级匹配的空穴传输材料（HTM）以及与准2D钙钛矿的化学相容性进行了研究。在此，一种基于聚乙烯骨架的新型非共轭聚合物，聚[3,6-（4,4'-二甲氧基三苯氨基）-9-乙烯基-9H-咔唑]（PVCz-OMeTPA），可以容易地合成并作为准2D PSC的有前途的无掺杂HTM进行研究。由于其更合适的能级，良好的空穴迁移率以及出色的成膜能力，有助于形成高质量的准2D钙钛矿薄膜，因此基于PVCz-的优化的p–i–n结构化准2D PSCs OMeTPA具有17.22％的最佳PCE。基于PVCz-OMeTPA的未封装的准2D PSC在1400h以下的相对湿度为≈40％的条件下保持82％的初始效率，并且在70°C的连续退火条件下老化600 h后仍能保持原始效率的81％以上。基于PVCz-OMeTPA的优化的p–i–n结构化准2D PSC的最佳PCE为17.22％。基于PVCz-OMeTPA的未封装的准2D PSC在1400h以下的相对湿度为≈40％的条件下保持82％的初始效率，并且在70°C的连续退火条件下老化600 h后仍能保持原始效率的81％以上。基于PVCz-OMeTPA的优化的p–i–n结构化准2D PSC的最佳PCE为17.22％。基于PVCz-OMeTPA的未封装的准2D PSC在1400h以下的相对湿度为≈40％的条件下保持82％的初始效率，并且在70°C的连续退火条件下老化600 h后仍能保持原始效率的81％以上。