A new series of structurally simple and easily accessible hole‐transporting materials (HTMs) YZT1–YZT4 using porphyrin backbone is devised for high‐performance perovskite solar cells (PSCs) with and without the aid of doping. The YZT‐series HTMs have either push–push or push–pull type planar linear molecular geometry with substitution of linear or branched alkylamine. UV–vis absorption, photoluminance (PL) quenching experiments, and theoretical studies all suggest a different pattern of molecular packing induced by molecular geometry and/or substituted chains. Nonetheless, both types of porphyrin HTMs perform well in TiO₂‐based PSCs when doped YZT4 with a power conversion efficiency (PCE) of 14.95% and undoped YZT1 with a PCE of 13.10%. The results clearly reveal the potential for porphyrin‐based HTMs for use in dopant‐free PSCs.

中文翻译：

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基于卟啉的简单实用的无掺杂空穴传输材料，用于使用TiO2半导体的高效钙钛矿太阳能电池

使用卟啉主链设计了一系列结构简单且易于使用的空穴传输材料（HTM）YZT1-YZT4，用于带或不带掺杂的高性能钙钛矿太阳能电池（PSC）。YZT系列HTM具有推挽式或推挽式平面线性分子几何结构，可替代线性或支链烷基胺。紫外可见吸收，光致发光（PL）猝灭实验和理论研究均表明，由分子几何形状和/或取代的链引起的分子堆积的模式不同。尽管如此，两种类型的卟啉HTM在TiO _2中均表现良好功率PSC为14.95％的YZT4和未掺杂的PCE为13.10％的YZT1时，基于PSC的PSC。结果清楚地表明了基于卟啉的HTM在无掺杂PSC中使用的潜力。