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Correlating the Hybridization of Local‐Exciton and Charge‐Transfer States with Charge Generation in Organic Solar Cells

Deping Qian Orcid Logo, Saied Md Pratik, Qi Liu, Yifan Dong, Rui Zhang, Jianwei Yu, Nicola Gasparini, Jiaying Wu, Tiankai Zhang, Veaceslav Coropceanu, Xia Guo, Maojie Zhang, Jean‐Luc Bredas, Feng Gao, James Durrant

Advanced Energy Materials, Volume: 13, Issue: 32, Start page: 2301026

Swansea University Author: James Durrant

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DOI (Published version): 10.1002/aenm.202301026

Abstract

In organic solar cells with very small energetic‐offset (ΔELE − CT), the charge‐transfer (CT) and local‐exciton (LE) states strongly interact via electronic hybridization and thermal population effects, suppressing the non‐radiative recombination. Here, we investigated the impact of these effects on...

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Published in: Advanced Energy Materials
ISSN: 1614-6832 1614-6840
Published: Wiley 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa70701
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spelling 2025-10-16T12:30:04.2940912 v2 70701 2025-10-16 Correlating the Hybridization of Local‐Exciton and Charge‐Transfer States with Charge Generation in Organic Solar Cells f3dd64bc260e5c07adfa916c27dbd58a James Durrant James Durrant true false 2025-10-16 In organic solar cells with very small energetic‐offset (ΔELE − CT), the charge‐transfer (CT) and local‐exciton (LE) states strongly interact via electronic hybridization and thermal population effects, suppressing the non‐radiative recombination. Here, we investigated the impact of these effects on charge generation and recombination. In the blends of PTO2:C8IC and PTO2:Y6 with very small, ultra‐fast CT state formation was observed, and assigned to direct photoexcitation resulting from strong hybridization of the LE and CT states (i.e., LE‐CT intermixed states). These states in turn accelerate the recombination of both CT and charge separated (CS) states. Moreover, they can be significantly weakened by an external‐electric field, which enhanced the yield of CT and CS states but attenuated the emission of the device. This study highlights that excessive LE‐CT hybridization due to very low , whilst enabling direct and ultrafast charge transfer and increasing the proportion of radiative versus non‐radiative recombination rates, comes at the expense of accelerating recombination losses competing with exciton‐to‐charge conversion process, resulting in a loss of photocurrent generation. Journal Article Advanced Energy Materials 13 32 2301026 Wiley 1614-6832 1614-6840 charge generation, hybridization, non-radiative voltage loss, organic solar cells 25 8 2023 2023-08-25 10.1002/aenm.202301026 COLLEGE NANME COLLEGE CODE Swansea University Another institution paid the OA fee Swedish Research Council VR (Grant Number: 2019-00677); National Natural Science Foundation of China (NSFC) (Grant Number: 51973146); Shandong Provincial Natural Science Foundation (Grant Number: ZR2022JQ09); Collaborative Innovation Center of Suzhou Nano Science & Technology; EPSRC project ATIP (Grant Number: EP/TO28513/1); Office of Naval Research (Grant Number: N00014-20-1-2110). 2025-10-16T12:30:04.2940912 2025-10-16T12:22:54.6685318 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Deping Qian 0009-0008-5530-514X 1 Saied Md Pratik 2 Qi Liu 3 Yifan Dong 4 Rui Zhang 5 Jianwei Yu 6 Nicola Gasparini 7 Jiaying Wu 8 Tiankai Zhang 9 Veaceslav Coropceanu 10 Xia Guo 11 Maojie Zhang 12 Jean‐Luc Bredas 13 Feng Gao 14 James Durrant 15 70701__35360__a34f4f7dbe7548049949d4a992fa527b.pdf 70701.VOR.pdf 2025-10-16T12:27:45.3932742 Output 2285936 application/pdf Version of Record true © 2023 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (CC BY). true eng http://creativecommons.org/licenses/by/4.0/
title Correlating the Hybridization of Local‐Exciton and Charge‐Transfer States with Charge Generation in Organic Solar Cells
spellingShingle Correlating the Hybridization of Local‐Exciton and Charge‐Transfer States with Charge Generation in Organic Solar Cells
James Durrant
title_short Correlating the Hybridization of Local‐Exciton and Charge‐Transfer States with Charge Generation in Organic Solar Cells
title_full Correlating the Hybridization of Local‐Exciton and Charge‐Transfer States with Charge Generation in Organic Solar Cells
title_fullStr Correlating the Hybridization of Local‐Exciton and Charge‐Transfer States with Charge Generation in Organic Solar Cells
title_full_unstemmed Correlating the Hybridization of Local‐Exciton and Charge‐Transfer States with Charge Generation in Organic Solar Cells
title_sort Correlating the Hybridization of Local‐Exciton and Charge‐Transfer States with Charge Generation in Organic Solar Cells
author_id_str_mv f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author James Durrant
author2 Deping Qian
Saied Md Pratik
Qi Liu
Yifan Dong
Rui Zhang
Jianwei Yu
Nicola Gasparini
Jiaying Wu
Tiankai Zhang
Veaceslav Coropceanu
Xia Guo
Maojie Zhang
Jean‐Luc Bredas
Feng Gao
James Durrant
format Journal article
container_title Advanced Energy Materials
container_volume 13
container_issue 32
container_start_page 2301026
publishDate 2023
institution Swansea University
issn 1614-6832
1614-6840
doi_str_mv 10.1002/aenm.202301026
publisher Wiley
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description In organic solar cells with very small energetic‐offset (ΔELE − CT), the charge‐transfer (CT) and local‐exciton (LE) states strongly interact via electronic hybridization and thermal population effects, suppressing the non‐radiative recombination. Here, we investigated the impact of these effects on charge generation and recombination. In the blends of PTO2:C8IC and PTO2:Y6 with very small, ultra‐fast CT state formation was observed, and assigned to direct photoexcitation resulting from strong hybridization of the LE and CT states (i.e., LE‐CT intermixed states). These states in turn accelerate the recombination of both CT and charge separated (CS) states. Moreover, they can be significantly weakened by an external‐electric field, which enhanced the yield of CT and CS states but attenuated the emission of the device. This study highlights that excessive LE‐CT hybridization due to very low , whilst enabling direct and ultrafast charge transfer and increasing the proportion of radiative versus non‐radiative recombination rates, comes at the expense of accelerating recombination losses competing with exciton‐to‐charge conversion process, resulting in a loss of photocurrent generation.
published_date 2023-08-25T05:31:28Z
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score 11.444473

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