Highly π-extended copolymer as additive-free hole-transport material for perovskite solar cells
perovskite solar cell, hole-transport layer, dopant-free, PDVT-10, stability
ABSTRACT Organolead halide perovskite solar cells have achieved a certified powerconversion efficiency (PCE) of 22.1% and are thus among the most promising candidates for next-generation photovoltaic devices. To date, most high-efficiency perovskite solar cells have employed arylamine-based hole-transport materials (HTMs), which are expensive and have a low mobility. The complicated doping procedures and the potentially stability-adverse dopants used in these HTMs are among the major bottlenecks for the commercialization of perovskite solar cells (PSCs). Herein, we present a polythiophene-based copolymer (PDVT-10) with a hole mobility up to 8.2 cm2·V−1·s−1 and a highest occupied molecular orbital level of −5.28 eV as a hole-transport layer (HTL) for a PSC. A device based on this new HTM exhibited a high PCE of 13.4% under 100 mW·cm−2 illumination, which is one of the highest PCEs reported for the dopant-free polymer-based HTLs. Moreover, PDVT-10 exhibited good solution processability, decent air stability, and thermal stability, making it a promising candidate as an HTM for PSCs.
Tsinghua University Press
Jie Liu,Qianqing Ge,Weifeng Zhang,Jingyuan Ma,Jie Ding,Gui Yu,Jinsong Hu, Highly π-extended copolymer as additive-free hole-transport material for perovskite solar cells. NanoRes.2018, 11(1): 185–194