HAN Fei 1 ,3, WANG Lingling 2, LIN Yuan 3
(1. Institute of Energy Research, Jiangxi Academy of Sciences, Nanchang 330096, Jiangxi, China; 2. Institute of Applied Chemistry, Jiangxi Academy of Sciences, Nanchang 330096, Jiangxi, China; 3. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China)
Abstract: In recent years, perovskite solar cells (PSCs) have become the most potential next generation thin-film solar cells, due to their advantages of adjustable bandgap, long charge carriers lifetime, solution processing and high power conversion efficiency (PCE). As an important part of PSC, the hole transporting layer (HTL) plays a key role in extracting and transmitting photo-generated holes, blocking electrons, modifying interfaces, adjusting interface energy levels and reducing charge recombination. The research progress of hole dopants in organic hole transporting materials (HTMs) in recent years was reviewed. The doping mechanism of metal-based hole dopants, ionic liquid hole dopants, organic electron acceptor hole dopants, Bronsted/Lewis acid hole dopants and other hole dopants and the correlation mechanism between the microstructure, conductivity and hole mobility of doped HTL films and the performances of PSCs (such as PCE and stability) were discussed in detail. The development trend of new hole dopants in efficient and stable PSCs is prospected, in order to provide references for further improving the performances of PSCs.
Key words: perovskite solar cell; hole transporting layer; hole dopant; efficiency; stability