High-Efficiency Indoor Organic Photovoltaics with a Band-Aligned Interlayer

By Lik-Kuen Ma, Yuzhong Chen, Philip C. Y. Chow, Guangye Zhang, Jiachen Huang, Chao Ma, Jianquan Zhang, Hang Yin, A. Cheung, K. Wong and 2 more. Joule, 2020

212 citations recorded by the source corpus.

Summary The emergence of indoor electronic devices for internet of things (IoT) has motivated the scientific community to develop photovoltaic devices that can efficiently convert indoor light into electricity. In this paper, we report high-efficiency non-fullerene organic photovoltaic (OPV) cells with over 30% power conversion efficiency (PCE) under indoor conditions. Our results show that the choice of electron-transporting layer (ETL) is critically important to enable such performance. The use of an ETL (named PDI-NO) with a deep highest occupied molecular orbital (HOMO) level can effectively suppress leakage current and reduce trap-assisted recombination of the devices. Thus, using this ETL, we achieve record PCE of 31% by utilizing a low-band-gap acceptor in the bulk-heterojunction (BHJ) blend. Whereas, in another case, by employing a large-band-gap acceptor, a PCE of 26.7% with over 1V is achieved. Our study paves the way toward high-performance indoor OPV devices for powering IoT electronics.

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/b799eb8aa798beee01c68f35b8dee0a1000075b4