Metal halide perovskite solar cells (PSCs) have attracted extensive research interest for next-generation solution-processed photovoltaic devices because of their high solar-to-electric power conversion efficiency (PCE) and low fabrication cost. Although the world’s best PSC successfully achieves a considerable PCE of over 20% within a very limited timeframe after intensive efforts, the stability, high cost, and up-scaling of PSCs still remain issues. Recently, inorganic perovskite material, CsPbBr₃, is emerging as a promising photo-sensitizer with excellent durability and thermal stability, but the efficiency is still embarrassing. In this work, we intend to address these issues by exploiting CsPbBr₃ as light absorber, accompanied by using Cu-phthalocyanine (CuPc) as hole transport material (HTM) and carbon as counter electrode. The optimal device acquires a decent PCE of 6.21%, over 60% higher than those of the HTM-free devices. The systematic characterization and analysis reveal a more effective charge transfer process and a suppressed charge recombination in PSCs after introducing CuPc as hole transfer layer. More importantly, our devices exhibit an outstanding durability and a promising thermal stability, making it rather meaningful in future fabrication and application of PSCs.

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金属卤化物钙钛矿太阳能电池（PSC）吸引了广泛的研究兴趣，因为它们具有高的太阳能到电能转换效率（PCE）和低的制造成本，因此成为了下一代溶液处理的光伏器件。经过努力，尽管世界上最好的PSC在非常有限的时间内成功地实现了20％以上的PCE，但是PSC的稳定性，高成本和扩大规模仍然是个问题。近来，无机钙钛矿材料CsPbBr ₃成为具有良好的耐久性和热稳定性的有前途的光敏剂，但是效率仍然令人尴尬。在这项工作中，我们打算通过利用CsPbBr ₃解决这些问题。作为光吸收剂，同时使用铜酞菁（CuPc）作为空穴传输材料（HTM）和碳作为反电极。最佳设备的PCE达到了6.21％，比不含HTM的设备高出60％以上。引入CuPc作为空穴传输层后，系统的表征和分析揭示了PSC中更有效的电荷传输过程和抑制的电荷复合。更重要的是，我们的设备具有出色的耐用性和有希望的热稳定性，这使其在PSC的未来制造和应用中具有重要意义。

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