An Asymmetric Coumarin-Anthracene Conjugate as Efficient Fullerene-Free Acceptor for Organic Solar Cells.

Autor: Niharika Bhuyan N; School of Chemistry, Sambalpur University, 768019, Jyoti Vihar, Sambalpur, India., Shankar S S; Department of Physics, The LNM Institute of Information Technology, Deemed University), Rupa ki Nagal, Jamdoli, 302031, Jaipur, Rajasthan, India., Jyoti Panda S; School of Chemical Sciences, National Institute of Science Education and Research, Jatni, 752050, Bhubaneswar, Orissa, India., Shekhar Purohit C; School of Chemical Sciences, National Institute of Science Education and Research, Jatni, 752050, Bhubaneswar, Orissa, India., Singhal R; Department of Physics, Malaviya National Institute of Technology, 302017, Jaipur, Rajasthan, India., Sharma GD; Department of Physics, The LNM Institute of Information Technology, Deemed University), Rupa ki Nagal, Jamdoli, 302031, Jaipur, Rajasthan, India., Mishra A; School of Chemistry, Sambalpur University, 768019, Jyoti Vihar, Sambalpur, India.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2024 Oct 01; Vol. 63 (40), pp. e202406272. Date of Electronic Publication: 2024 Jun 21.
DOI: 10.1002/anie.202406272
Abstrakt: Asymmetric wide-band gap fullerene-free acceptors (FFAs) play a crucial role in organic solar cells (OSCs). Here, we designed and synthesized a simple asymmetric coumarin-anthracene conjugate named CA-CN with optical band gap of 2.1 eV in a single-step condensation reaction. Single crystal X-ray structure analysis confirms various multiple intermolecular non-covalent interactions. The molecular orbital energy levels of CA-CN estimated from cyclic voltammetry were found to be suitable for its use as an acceptor for OSCs. Binary OSCs fabricated using CA-CN as acceptor and PTB7-Th as the donor achieve a power conversion efficiency (PCE) of 11.13 %. We further demonstrate that the insertion of 20 wt % of CA-CN as a third component in ternary OSCs with PTB7-Th : DICTF as the host material achieved an impressive PCE of 14.91 %, an improvement of ~43 % compared to the PTB7-Th : DICTF binary device (10.38 %). Importantly, the ternary blend enhances the absorption coverage from 400 to 800 nm and improves the morphology of the active layer. The findings highlight the efficacy of an asymmetric design approach for FFAs, which paves the way for developing high-efficiency OSCs at low cost.
(© 2024 Wiley-VCH GmbH.)
Databáze: MEDLINE
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