Wide Bandgap Polymer Donors Based on Succinimide-Substituted Thiophene for Nonfullerene Organic Solar Cells.

Autor: Yuan Y; Department of Chemical Engineering and Waterloo Institute for Nanotechnology (WIN), University of Waterloo, 200 University Ave West, Waterloo, N2L 3G1, Canada., Flynn S; Department of Chemical Engineering and Waterloo Institute for Nanotechnology (WIN), University of Waterloo, 200 University Ave West, Waterloo, N2L 3G1, Canada., Li X; Institute of Chemistry, Henan Academy of Sciences, Jinshui District, 56 Hongzhuan Road, Zhengzhou, Henan, 450002, China., Liu H; Institute of Chemistry, Henan Academy of Sciences, Jinshui District, 56 Hongzhuan Road, Zhengzhou, Henan, 450002, China., Wang J; Institute of Chemistry, Henan Academy of Sciences, Jinshui District, 56 Hongzhuan Road, Zhengzhou, Henan, 450002, China., Li Y; Department of Chemical Engineering and Waterloo Institute for Nanotechnology (WIN), University of Waterloo, 200 University Ave West, Waterloo, N2L 3G1, Canada.
Jazyk: angličtina
Zdroj: Macromolecular rapid communications [Macromol Rapid Commun] 2024 Sep; Vol. 45 (17), pp. e2400275. Date of Electronic Publication: 2024 Jun 12.
DOI: 10.1002/marc.202400275
Abstrakt: The advent of nonfullerene acceptors (NFAs) has greatly improved the photovoltaic performance of organic solar cells (OSCs). However, to compete with other solar cell technologies, there is a pressing need for accelerated research and development of improved NFAs as well as their compatible wide bandgap polymer donors. In this study, a novel electron-withdrawing building block, succinimide-substituted thiophene (TS), is utilized for the first time to synthesize three wide bandgap polymer donors: PBDT-TS-C5, PBDT-TSBT-C12, and PBDTF-TSBT-C16. These polymers exhibit complementary bandgaps for efficient sunlight harvesting and suitable frontier energy levels for exciton dissociation when paired with the extensively studied NFA, Y6. Among these donors, PBDTF-TSBT-C16 demonstrates the highest hole mobility and a relatively low highest occupied molecular orbital (HOMO) energy level, attributed to the incorporation of thiophene spacers and electron-withdrawing fluorine substituents. OSC devices based on the blend of PBDTF-TSBT-C16:Y6 achieve the highest power conversion efficiency of 13.21%, with a short circuit current density (J sc ) of 26.83 mA cm -2 , an open circuit voltage (V oc ) of 0.80 V, and a fill factor of 0.62. Notably, the V oc × J sc product reaches 21.46 mW cm -2 , demonstrating the potential of TS as an electron acceptor building block for the development of high-performance wide bandgap polymer donors in OSCs.
(© 2024 The Author(s). Macromolecular Rapid Communications published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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