Charge transport layer plays a critical role in high-performance perovskite solar cells (PSCs). Herein, few-layered 2D black phosphorus (BP) nanosheet doped poly(triarylamine) (PTAA) is employed as hole transport layer for PSCs. The BP:PTAA significantly improves charge extraction at perovskite/BP:PTAA interface together with the smaller energy barrier, the increased conductivity of the PTAA film, and the formation of the high-quality perovskite film with enlarged crystal gain size, which suppress the interfacial charge recombination and trap-assisted recombination. As a result, the champion device using BP:PTAA produces the higher power conversion efficiency of 20.49% than the control device of 18.26%. Moreover, the remarkable improvement in device stability has been demonstrated attributed to the more hydrophobicity of BP:PTAA and the perovskite layer with less defect states. This work provides an effective hole transport layer for PSCs, which is comparable with the commonly used 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ):PTAA.

电荷传输层在高性能钙钛矿太阳能电池（PSC）中起着关键作用。在本文中，少量层掺杂的二维黑磷（BP）纳米片掺杂的聚三芳基胺（PTAA）被用作PSC的空穴传输层。BP：PTAA显着改善了钙钛矿/ BP：PTAA界面处的电荷提取，同时具有更小的能垒，增加了PTAA膜的电导率以及形成了具有更大晶体增益尺寸的高质量钙钛矿膜，从而抑制了界面电荷重组和陷阱辅助重组。结果，使用BP：PTAA的冠军设备产生的功率转换效率比控制设备的18.26％更高，为20.49％。此外，由于BP具有更大的疏水性，因此已经证明了设备稳定性的显着提高：PTAA和钙钛矿层的缺陷状态较少。这项工作为PSC提供了有效的空穴传输层，可与常用的2,3,5,6-四氟-7,7,8,8-四氰基喹二甲烷（F4TCNQ）：PTAA媲美。