Perovskite solar cell (PSC) is a promising photovoltaic technology that achieves over 26% power conversion efficiency (PCE). However, the high materials costs, complicated fabrication process, as well as poor long‐term stability, are stumbling blocks for the commercialization of the PSCs in normal structures. The hole transport layer (HTL)‐free carbon‐based PSCs (C‐PSCs) are expected to overcome these challenges. However, C‐PSCs have suffered from relatively low PCE due to severe energy loss at the perovskite/carbon interface. Herein, the study proposes to boost the hole extraction capability of carbon electrode by incorporating functional manganese (II III) oxide (Mn3O4). It is found that the work function (WF) of the carbon electrode can be finely tuned with different amounts of Mn3O4 addition, thus the interfacial charge transfer efficiency can be maximized. Besides, the mechanical properties of carbon electrode can also be strengthened. Finally, a PCE of 19.03% is achieved. Moreover, the device retains 90% of its initial PCE after 2000 h of storage. This study offers a feasible strategy for fabricating efficient paintable HTL‐free C‐PSCs.

中文翻译：

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调整碳电极的功函数以促进无空穴传输层钙钛矿太阳能电池中的电荷提取

钙钛矿太阳能电池 (PSC) 是一种很有前途的光伏技术，可实现超过 26% 的功率转换效率 (PCE)。然而，高昂的材料成本、复杂的制造工艺以及较差的长期稳定性是普通结构中PSC商业化的绊脚石。无空穴传输层（HTL）的碳基PSC（C-PSC）有望克服这些挑战。然而，由于钙钛矿/碳界面处的严重能量损失，C-PSC 的 PCE 相对较低。在此，该研究提出通过掺入功能性锰（II III）氧化物（Mn）来提高碳电极的空穴提取能力3氧4）。发现功函数（瓦F）的碳电极可以用不同数量的Mn进行微调3氧4另外，因此可以最大化界面电荷转移效率。此外，还可以增强碳电极的机械性能。最终，PCE达到19.03%。此外，该器件在存储 2000 小时后仍保留其初始 PCE 的 90%。这项研究为制造高效的可涂漆无 HTL C-PSC 提供了一种可行的策略。