Carbon-based CsPbI₂Br perovskite solar cell (PSC) is one of the competitive candidates for photovoltaic application owing to its outstanding thermal stability and low-cost process. However, their power conversion efficiency (PCE) is significantly lower than that of the organic-inorganic hybrid PSCs, which is mainly attributed to the serious charge recombination and undesirable hole extraction at the CsPbI₂Br/carbon interface. In this work, a solution-processed dopant-free copper phthalocyanine (CuPc) derivative hole transport layer (HTL) is used to modify the CsPbI₂Br/carbon interface to promote charge transport and suppress charge recombination. At the optimal CuPc derivative concentration, the modified PSC shows a champion PCE up to 11.04% with less hysteresis, which is 18% higher than that of the reference PSC. Moreover, the unsealed device with CuPc derivative exhibits a promising air and thermal stability. The improved performance results from the good energy level alignment, the reduced trap-state density, the suppressed charge recombination and excellent stability of the CuPc derivative. This work reveals the potential of using solution-processed dopant-free CuPc derivative as HTL to fabricate efficient and stable carbon-based inorganic PSCs.

碳基CsPbI ₂ Br钙钛矿太阳能电池（PSC）由于其出色的热稳定性和低成本工艺而成为光伏应用的竞争性候选之一。但是，它们的功率转换效率（PCE）明显低于有机-无机杂化PSC的功率转换效率，这主要归因于CsPbI ₂ Br /碳界面处的严重电荷复合和不良的空穴提取。在这项工作中，使用溶液处理的无掺杂剂酞菁铜（CuPc）衍生物空穴传输层（HTL）来修饰CsPbI ₂Br /碳界面可促进电荷传输并抑制电荷复合。在最佳CuPc衍生物浓度下，修饰的PSC表现出高达11.04％的冠军PCE，且滞后现象更少，这比参考PSC高18％。而且，具有CuPc衍生物的未密封装置具有良好的空气和热稳定性。性能的改善归因于良好的能级对准，降低的陷阱态密度，抑制的电荷复合以及CuPc衍生物的出色稳定性。这项工作揭示了使用溶液处理的无掺杂剂的CuPc衍生物作为HTL来制造高效且稳定的碳基无机PSC的潜力。