Long-range exciton diffusion in molecular non-fullerene acceptors

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Type
Article
Authors
Firdaus, Yuliar cc
Le Corre, Vincent M. cc
Karuthedath, Safakath cc
Liu, Wenlan
Markina, Anastasia
Huang, Wentao
Chattopadhyay, Shirsopratim
Nahid, Masrur Morshed
Nugraha, Mohamad I.
Lin, Yuanbao cc
Seitkhan, Akmaral cc
Basu, Aniruddha cc
Zhang, Weimin
McCulloch, Iain cc
Ade, Harald
Labram, John G. cc
Laquai, Frédéric cc
Andrienko, Denis cc
Koster, L. Jan Anton
Anthopoulos, Thomas D. cc
KAUST Department
Physical Science and Engineering (PSE) Division
King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE), Material Science and Engineering Program (MSE), 23955-6900, Thuwal, Kingdom of Saudi Arabia
Material Science and Engineering
Material Science and Engineering Program
KAUST Solar Center (KSC)
Chemical Science Program
KAUST Grant Number
Award No. OSR-2018-CARF/CCF-3079.
Date
2020-10-15
Online Publication Date
2020-10-15
Print Publication Date
2020-12
Submitted Date
2020-07-06
Permanent link to this record
http://hdl.handle.net/10754/665769

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Abstract
Abstract The short exciton diffusion length associated with most classical organic semiconductors used in organic photovoltaics (5-20 nm) imposes severe limits on the maximum size of the donor and acceptor domains within the photoactive layer of the cell. Identifying materials that are able to transport excitons over longer distances can help advancing our understanding and lead to solar cells with higher efficiency. Here, we measure the exciton diffusion length in a wide range of nonfullerene acceptor molecules using two different experimental techniques based on photocurrent and ultrafast spectroscopy measurements. The acceptors exhibit balanced ambipolar charge transport and surprisingly long exciton diffusion lengths in the range of 20 to 47 nm. With the aid of quantum-chemical calculations, we are able to rationalize the exciton dynamics and draw basic chemical design rules, particularly on the importance of the end-group substituent on the crystal packing of nonfullerene acceptors.
Citation
Firdaus, Y., Le Corre, V. M., Karuthedath, S., Liu, W., Markina, A., Huang, W., … Anthopoulos, T. D. (2020). Long-range exciton diffusion in molecular non-fullerene acceptors. Nature Communications, 11(1). doi:10.1038/s41467-020-19029-9
Sponsors
This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2018-CARF/CCF-3079. The work by V.M.L.C. is supported by a grant from STW/NWO (VIDI 13476). This is a publication by the FOM Focus Group “Next Generation Organic Photovoltaics”, participating in the Dutch Institute for Fundamental Energy Research (DIFFER). D.A. acknowledges funding from the BMBF grants InterPhase and MESOMERIE (FKZ 13N13661, FKZ 13N13656) and the European Union Horizon 2020 research and innovation program “Widening materials models” under Grant Agreement No. 646259 (MOSTOPHOS). D.A. also acknowledges the KAUST PSE Division for hosting his sabbatical in the framework of the Division’s Visiting Faculty program. A.M. acknowledges postdoctoral support of the Alexander von Humboldt Foundation. H.A.and M.M.N. acknowledge the support from the University of North Carolina General Administration Research Opportunity Initiative (ROI) and U.S. Department of Energy (DE-AC02-05CH11231) for X-ray data acquisition at beamline 7.3.3 at the Advanced Light Source (ALS) in Berkeley National Laboratory, California.
Publisher
Springer Nature
Journal
Nature Communications
DOI
10.1038/s41467-020-19029-9
PubMed ID
33060574
PubMed Central ID
PMC7562871
Additional Links
http://www.nature.com/articles/s41467-020-19029-9
Collections
Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Solar Center (KSC)
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Except where otherwise noted, this item's license is described as This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.