Carbon-based perovskite solar cells (C-PSCs) are promising contenders for the next generation solar cells with high stability and low cost. However, the absence of hole transport layer (HTL) results in a large energy-level mismatch at the interface between perovskite and carbon electrode, which hampers hole extraction and then leads to lower efficiency of C-PSCs compared with metal electrode-based PSCs. In this work, a novel hybrid hole conductor of poly-3-hexylthiophene - CsPbI₃ quantum dots (P-QD) is used to improve hole extraction in CsPbI₂Br C-PSCs. In this P-QD hybrid hole conductor, P3HT replaces the initial oleic acid ligands around QDs. This not only improves the stability but also facilitates charge extraction and transport of QDs. The application of P-QD in CsPbI₂Br C-PSCs effectively improves hole extraction by aligning perovskite/carbon energy-level, thus reducing the non-radiative recombination loss in devices. Furthermore, due to the narrow bandgap, CsPbI₃ QDs extend the optical response range of CsPbI₂Br solar cells. As a result, the P-QD hybrid hole conductor increases the power conversion efficiency of CsPbI₂Br C-PSCs from 13.49% to 15.04%. This strategy provides a new approach for the construction of HTL in C-PSCs.

碳基钙钛矿太阳能电池（C-PSCs）是具有高稳定性和低成本的下一代太阳能电池的有希望的竞争者。然而，空穴传输层 (HTL) 的缺失导致钙钛矿和碳电极之间的界面存在较大的能级失配，这阻碍了空穴的提取，进而导致 C-PSC 的效率低于基于金属电极的 PSC。在这项工作中，一种新型的聚-3-己基噻吩混合空穴导体-CsPbI ₃量子点（P-QD）被用来改善CsPbI ₂ Br C-PSCs中的空穴提取。在这种 P-QD 杂化空穴导体中，P3HT 取代了 QD 周围的初始油酸配体。这不仅提高了稳定性，而且有利于 QD 的电荷提取和传输。P-QD在CsPbI中的应用₂ Br C-PSCs通过调整钙钛矿/碳能级有效地提高了空穴提取率，从而降低了器件中的非辐射复合损失。此外，由于窄带隙，CsPbI _{3量子点扩展了CsPbI 2} Br太阳能电池的光学响应范围。结果，P-QD混合空穴导体将CsPbI ₂ Br C-PSC的功率转换效率从13.49%提高到15.04%。该策略为在 C-PSC 中构建 HTL 提供了一种新方法。