Solution-processed organic semiconductor layers on rough surfaces tend to vary widely in thickness, significantly hindering charge extraction in relevant optoelectronic devices. Herein, we report the photoactivated p-doping of hole-transporting material (HTM) to enhance hole extraction for (textured) perovskite/silicon tandem solar cells, making the device performance less sensitive to the variation of hole transport layer thickness. We used the ionic compound 4-isopropyl-4′-methyldiphenyliodonium tetrakis(penta-fluorophenyl-borate) (DPI-TPFB) as a p-type dopant in poly(triaryl amine) (PTAA), which we used as the HTM. We observed that light soaking DPI-TPFB-doped PTAA shows approximately 22 times higher conductivity compared with an undoped PTAA film, which translated into an improved fill factor (FF) for tandem solar cells. Our tandem solar cells achieved an ∼80% FF and 27.8% efficiency and operated at their maximum power point for 200 h without loss of performance, in addition to retaining ∼83% of initial performance over a month of operation in an outdoor environment.

中文翻译：

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有机中间层的光活化 p 型掺杂可实现高效钙钛矿/硅串联太阳能电池

粗糙表面上的溶液处理有机半导体层的厚度往往变化很大，严重阻碍了相关光电器件中的电荷提取。在这里，我们报告了空穴传输材料 (HTM) 的光活化 p 掺杂，以增强（纹理）钙钛矿/硅串联太阳能电池的空穴提取，使器件性能对空穴传输层厚度的变化不太敏感。我们使用离子化合物 4-异丙基-4'-甲基二苯基碘鎓四（五氟苯基硼酸盐）（DPI-TPFB）作为聚（三芳基胺）（PTAA）中的 p 型掺杂剂，我们将其用作 HTM。我们观察到，与未掺杂的 PTAA 膜相比，光浸泡 DPI-TPFB 掺杂的 PTAA 显示出大约 22 倍的电导率，这转化为串联太阳能电池的改进的填充因子 (FF)。