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Correlating charge-transfer state lifetimes with material ener-getics in polymer:non-fullerene acceptor organic solar cells

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Title: Correlating charge-transfer state lifetimes with material ener-getics in polymer:non-fullerene acceptor organic solar cells
Authors: Dong, Y
Cha, H
Bristow, H
Lee, J
Kumar, A
McCulloch, I
Bakulin, A
Durrant, J
Item Type: Journal Article
Abstract: Minimizing the energy offset between the lowest exciton and charge-transfer (CT) states is a widely employed strategy to suppress the energy loss (Eg/q – VOC) in polymer:non-fullerene acceptor (NFA) organic solar cells (OSCs). In this work, transient absorption spectroscopy is employed to determine CT state lifetimes in a series of low energy loss polymer:NFA blends. The CT state lifetime is observed to show an inverse energy gap law dependence and decreases as the energy loss is reduced. This behavior is assigned to increased mixing/hybridization between these CT states and shorter-lived singlet excitons of the lower gap component as the energy offset ΔECT-S1 is reduced. This study highlights how achieving longer exciton and CT state lifetimes has the potential for further enhancement of OSC efficiencies.
Issue Date: 26-May-2021
Date of Acceptance: 20-Apr-2021
URI: http://hdl.handle.net/10044/1/89379
DOI: 10.1021/jacs.1c00584
ISSN: 0002-7863
Publisher: American Chemical Society
Start Page: 7599
End Page: 7603
Journal / Book Title: Journal of the American Chemical Society
Volume: 143
Issue: 20
Copyright Statement: © 2021 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/jacs.1c00584
Keywords: 03 Chemical Sciences
General Chemistry
Publication Status: Published
Online Publication Date: 2021-04-23
Appears in Collections:Chemistry