Nickel oxide (NiOx) is a promising hole transport layer (HTL) to fabricate efficient and large‐scale inverted perovskite solar cells (PSCs) due to its low cost and superior chemical stability. However, inverted PSCs based on NiOx are still lagging behind that of other HTL because of the poor quality of buried interface contact. Herein, a bidentate ligand, 4,6‐bis (diphenylphosphino) phenoxazine (2DPP), is used to regulate the NiOx surface and perovskite buried interface. The diphosphine Lewis base in the 2DPP molecule can coordinate both with NiOx and lead ions at NiOx/perovskite interface, leading to high‐quality perovskite films with minimized defects. It is found that the inverted PSCs with 2DPP‐modified buried interface exhibit double advantages of being both fast charge extraction and reduced nonradiative recombination, which is a combination of multiple factors including favorable energetic alignment, improved interface contact and strong binding between NiOx/2DPP and perovskite. The optimal PSC based on 2DPP modification yields a champion power conversion efficiency (PCE) of 21.9%. The unencapsulated PSC maintains above 75% of its initial PCE in the air with a relative humidity (RH) of 30–40% for 1000 h.

中文翻译：

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通过双齿锚定改善倒置钙钛矿太阳能电池的埋入界面接触


氧化镍（NiOx）由于其低成本和优异的化学稳定性，是一种很有前景的空穴传输层（HTL），可用于制造高效、大规模的倒置钙钛矿太阳能电池（PSC）。然而，由于埋入界面接触质量较差，基于NiOx的倒置PSC仍然落后于其他HTL。在此，双齿配体4,6-双（二苯基膦）吩恶嗪（2DPP）用于调节NiOx表面和钙钛矿埋入界面。 2DPP分子中的二膦路易斯碱可以在NiOx/钙钛矿界面处与NiOx和铅离子配位，从而形成缺陷最小化的高质量钙钛矿薄膜。研究发现，具有 2DPP 修饰的埋入界面的倒置 PSC 具有快速电荷提取和减少非辐射复合的双重优势，这是多种因素的结合，包括有利的能量排列、改善的界面接触以及 NiOx/2DPP 和 NiOx/2DPP 之间的强结合。钙钛矿。基于 2DPP 修改的最佳 PSC 产生了 21.9% 的冠军功率转换效率 (PCE)。未封装的 PSC 在相对湿度 (RH) 为 30-40% 的空气中可保持 75% 以上的初始 PCE，持续 1000 小时。