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End Group Tuning in Acceptor–Donor–Acceptor Nonfullerene Small Molecules for High Fill Factor Organic Solar Cells

Andrew Wadsworth, Helen Bristow, Zeinab Hamid, Maxime Babics, Nicola Gasparini, Colm W. Boyle, Weimin Zhang, Yifan Dong, Karl. J. Thorley, Marios Neophytou, Raja Shahid Ashraf, James Durrant Orcid Logo, Derya Baran, Iain McCulloch

Advanced Functional Materials, Start page: 1808429

Swansea University Author: James Durrant Orcid Logo

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DOI (Published version): 10.1002/adfm.201808429

Abstract

High fill factors have only recently become commonplace in nonfullerene‐based organic solar cells, with the balance of charge carrier mobilities often cited as the contributing factor. Here an end‐group modification to a commonly used nonfullerene acceptor (O‐IDTBR) is reported, in which the rhodani...

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Published in: Advanced Functional Materials
ISSN: 1616-301X 1616-3028
Published: 2019
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa50978
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Abstract: High fill factors have only recently become commonplace in nonfullerene‐based organic solar cells, with the balance of charge carrier mobilities often cited as the contributing factor. Here an end‐group modification to a commonly used nonfullerene acceptor (O‐IDTBR) is reported, in which the rhodanine end groups are replaced with dicyano moieties, resulting in the acceptor O‐IDTBCN. This new acceptor affords significant improvement in the fill factor (73%) and photocurrent (19.8 mA cm−2) in organic solar cells with the low bandgap polymer PTB7‐Th. A narrowing of the bandgap, as a result of greater push–pull hybridization, allows complementary absorption to the donor and thus improved photon harvesting. Additionally, the measurement of charge carrier mobilities and lifetimes in both systems reveal that the PTB7‐Th:O‐IDTBCN blend possesses more balanced charge carrier mobilities, and longer lifetimes. Morphology studies reveal a slightly greater degree of molecular mixing of the O‐IDTBCN when blended with PTB7‐Th, despite the greater and more balanced charge carrier mobilities in this blend.
College: College of Engineering
Start Page: 1808429