倒置钙钛矿太阳能电池的空穴传输层的研究进展

倒置钙钛矿太阳能电池(PSCs)具有器件结构简单、吸光系数高、迟滞效应小、良好的缺陷容忍性等优点，受到了广泛的关注。但倒置器件光电转换效率(PCE)尚有待提高，究其原因是空穴传输层(HTL)和钙钛矿层界面处的能量损失表现出相对较小的开路电压。文章综述了包括有机聚合物、无机物、尖晶石氧化物等作为空穴传输材料的相关研究进展，进一步分析了通过调节电极/空穴传输层能级使之与钙钛矿价带匹配，及通过界面修饰促进器件对载流子的注入与收集，从而提高光电转换效率的研究现状。对提高倒置钙钛矿太阳能电池性能的研究具有一定的指导意义，最后对倒置器件的应用前景进行了展望。

Research progress of hole transport layer in inverted perovskite solar cells

Inverted perovskite solar cells (PSCs) have attracted much attention because of their simple structure, high absorption coefficient, small hysteresis effect, and good defect tolerance. However, the photoelectric conversion efficiency (PCE) of the inverted devices needs to be improved. The reason is that the energy loss at the interface between the hole transport layer (HTL) and the perovskite layer shows a relatively small open-circuit voltage. This paper reviews the research progress of organic polymers, inorganic compounds, and spinel oxides as hole transport materials. In addition, the current research status of increasing PCE is analyzed, including adjusting electrode/HTL energy level to match with the valence band of perovskite, and improving carrier injection and collection by devices via interfacial modification. It provides guidance for improving the performance of inverted PSCs. Finally, the application prospect of inverted devices is proposed.