Efficient furan-bridged dibenzofulvene-triphenylamine hole transporting materials for perovskite solar cells

• Published in: Materials advances Vol. 4; no. 2; pp. 515 - 522
• Main Authors: Wu, Nan, Zhang, Xianfu, Liu, Xuepeng, Wang, Ying, Han, Mingyuan, Ghadari, Rahim, Wu, Yahan, Ding, Yong, Cai, Molang, Dai, Songyuan
• Format: Journal Article
• Language: English
• Published: 23.01.2023
• ISSN: 2633-5409; 2633-5409
• DOI: 10.1039/d2ma00908k

Inspired by the superior properties of dibenzofulvene-triphenylamine hole transporting materials (HTMs), a rationally designed type of HTM with furan as the side-arm bridge has been synthesized, namely, FF-OMeTPA. A dibenzofulvene-triphenylamine HTM with thiophene as the side-arm bridge (FT-OMeTPA) is also prepared. The effect of heteroatomic sulfur-to-oxygen change on the molecular and photovoltaic properties in perovskite solar cells was investigated. The experimental and theoretical results illustrate that the furan-based molecule has better conjugation than the thiophene-based one, leading to higher hole mobility. The PSC employing oxygen-containing FF-OMeTPA delivered a power conversion efficiency (PCE) of 21.82%, whereas the FT-OMeTPA-based PSC exhibited a lower PCE of 18.01%. Significantly, the FF-OMeTPA-based devices also outperform those employing conventional spiro-OMeTAD. In addition, the studied molecules exhibit comparable device stability and much lower synthesis cost than spiro-OMeTAD. The perovskite solar cells employing cost-effective FF-OMeTPA exhibit a PCE of 21.82%, which is higher than the PCE of solar cells employing conventional spiro-OMeTAD.