We discovered that an alcohol soluble non-fullerene small molecule perylene diimides derivative (PDIN), which is a traditional cathode interface material, can be used as a promising electron transporting material for efficient p-i-n perovskite solar cells. Surprisingly, by using 2,2,2-Trifluoroethanol as solvent for PDIN, it can easily form high quality PDIN thin film onto the perovskite layer and overcome the erosion problem of conventional alcohol solvents such as methanol and ethanol etc. In addition, PDIN can efficiently quench the photoluminescence of perovskite layer and extract electrons from perovskite layer. Finally, a power conversion efficiency of 15.28% is achieved from the device with PDIN as electron transporting layer, which is significantly higher than the PC₆₁BM only device. Further, we also found that the performance of the device with PDIN as electron transporting layer is not sensitive to the PDIN's thickness. These results indicate that PDIN is a promising electron transporting material for efficient p-i-n perovskite solar cells.

我们发现，一种醇溶性非富勒烯小分子per二酰亚胺衍生物（PDIN）是一种传统的阴极界面材料，可以用作有效的针状钙钛矿太阳能电池的有希望的电子传输材料。出乎意料的是，通过使用2,2,2-三氟乙醇作为PDIN的溶剂，它可以轻松地在钙钛矿层上形成高质量的PDIN薄膜，并克服了常规醇溶剂（如甲醇和乙醇等）的腐蚀问题。有效地淬灭钙钛矿层的光致发光并从钙钛矿层提取电子。最终，以PDIN作为电子传输层的器件实现了15.28％的功率转换效率，远高于PC ₆₁仅限BM设备。此外，我们还发现以PDIN作为电子传输层的器件的性能对PDIN的厚度不敏感。这些结果表明，PDIN是用于有效的针脚钙钛矿太阳能电池的有希望的电子传输材料。