Yao Yiguo, Cheng Caidong, Zhang Chenyang, Hu Hanlin, Wang Kai, De Wolf Stefaan
Institute of Flexible Electronics (IFE), Northwestern Polytechnical University (NPU), Xi'an, 710072, China.
Hoffman Institute of Advanced Materials, Shenzhen Polytechnic, 7098 Liuxian Boulevard, Shenzhen, 518055, China.
Adv Mater. 2022 Nov;34(44):e2203794. doi: 10.1002/adma.202203794. Epub 2022 Sep 30.
Hole-transporting layers (HTLs) are an essential component in inverted, p-i-n perovskite solar cells (PSCs) where they play a decisive role in extraction and transport of holes, surface passivation, perovskite crystallization, device stability, and cost. Currently, the exploration of efficient, stable, highly transparent and low-cost HTLs is of vital importance for propelling p-i-n PSCs toward commercialization. Compared to their inorganic counterparts, organic HTLs offer multiple advantages such as a tunable bandgap and energy level, easy synthesis and purification, solution processability, and overall low cost. Here, recent progress of organic HTLs, including conductive polymers, small molecules, and self-assembled monolayers, as utilized in inverted PSCs is systematically reviewed and summarized. Their molecular structure, hole-transport properties, energy levels, and relevant device properties and resulting performances are presented and analyzed. A summary of design principles and a future outlook toward highly efficient organic HTLs in inverted PSCs is proposed. This review aims to inspire further innovative development of novel organic HTLs for more efficient, stable, and scalable inverted PSCs.
空穴传输层（HTLs）是倒置p-i-n型钙钛矿太阳能电池（PSCs）的重要组成部分，在空穴的提取和传输、表面钝化、钙钛矿结晶、器件稳定性和成本方面起着决定性作用。目前，探索高效、稳定、高透明且低成本的空穴传输层对于推动p-i-n型钙钛矿太阳能电池商业化至关重要。与无机空穴传输层相比，有机空穴传输层具有多种优势，如可调谐的带隙和能级、易于合成和纯化、可溶液加工以及总体成本较低。在此，系统地综述和总结了用于倒置钙钛矿太阳能电池的有机空穴传输层的最新进展，包括导电聚合物、小分子和自组装单分子层。介绍并分析了它们的分子结构、空穴传输特性、能级以及相关的器件特性和由此产生的性能。提出了设计原则的总结以及对倒置钙钛矿太阳能电池中高效有机空穴传输层的未来展望。本综述旨在激发新型有机空穴传输层的进一步创新发展，以实现更高效、稳定和可扩展的倒置钙钛矿太阳能电池。
