Recent progress in organic hole-transporting materials with 4-anisylamino-based end caps for efficient perovskite solar cells

• Published in: Rare metals Vol. 40; no. 7; pp. 1669 - 1690
• Main Authors: Xu, Xiao-Peng, Li, Shi-Yang, Li, Ying, Peng, Qiang
• Format: Journal Article
• Language: English
• Published: Beijing Nonferrous Metals Society of China 01.07.2021; Springer Nature B.V
• Subjects: Biomaterials; Carbazoles; Chemistry and Materials Science; Energy; Energy conversion efficiency; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Perovskites; Photovoltaic cells; Physical Chemistry; Review; Solar cells; Transportation; Small molecules; 4-Anisylamino derivatives; Hole-transporting materials; Perovskite solar cells
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-020-01617-9

Perovskite solar cells (PVSCs) have emerged as a promising photovoltaic technology and have attracted wide research interest due to their outstanding photovoltaic performance, low cost, and the ability to fabricate large-area devices. An impressive certified power conversion efficiency (PCE) of 25.2% has been achieved, demonstrating the excellent potential of PVSCs for future applications. Hole-transporting materials play a key role in improving the device performance of PVSCs by facilitating the extraction of photogenerated holes and their transport from the perovskite layer to the anode. This review provides a brief introduction to PVSCs and summarizes the recent progress in small molecule hole-transporting materials (SM-HTMs) bearing various cores and different 4-anisylamino-based end caps. We classify the end caps into N,N-di-4-anisylamino (DAA), 4-(N,N-di-4-anisylamino)benzo (DAB), and N3, N6(or N2, N7)-bis(di-4-anisylamino)-9H-carbazole (3,6-DAC or 2,7-DAC) groups. We also review the core type, end cap position and number, how these affect the overall properties of the SM-HTMs, and the resultant PVSC device performances. Finally, the challenges and perspectives for the future development of SM-HTMs are presented. Graphic abstract