Defective MWCNT Enabled Dual Interface Coupling for Carbon‐Based Perovskite Solar Cells with Efficiency Exceeding 22%

• DOI: 10.1002/adfm.202204831
• Publication Date: 2022-05-14T09:10:51Z
• Authors: Yudi Wang; Wenrui Li; Yanfeng Yin; Minhuan Wang; Wanxian Cai; Yanying Shi; Jingya Guo; Wenzhe Shang; Chunyang Zhang; Qingshun Dong; Hongru Ma; Jing Liu; Wenming Tian; Shengye Jin; Jiming Bian; Yantao Shi
• Keywords: Carbon fibers; Perovskite solar cell

Abstract Suffering from sluggish charge transfer kinetics, carbon‐based perovskite solar cells (C‐PSCs) lag far behind the Ag/Au‐based normal PSCs in power conversion efficiency (PCE). Herein, use of defective multi‐walled CNT (D‐MWCNT) is demonstrated to tune kinetics regarding hole transport layer (HTL) and interface between HTL carbon electrode. Benefiting electrostatic dipole moment interaction terminal oxygen‐containing groups D‐MWCNT 2,2′,7,7′‐tetrakis( N , ‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene, an coupling at molecular level established turn, allows rapid by edge effect induced electron redistribution 1D hyper‐channels. Meanwhile, a seamless connection electrode achieved novel modular C‐PSCs due with graphene nanometer scale. Based on this strategy, high PCEs up 22.07% (with certified record PCE 21.9% date for C‐PSCs) excellent operational stability have been achieved.