Cited by 387Organic Electronics and PhotovoltaicsOrganic Light-Emitting Diodes ResearchConducting polymers and applications

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Exploring the origin of high optical absorption in conjugated polymers

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Vezie, Michelle S., Few, Sheridan, Meager, Iain, Pieridou, Galatia, Dörling, Bernhard, Ashraf, Raja Shahid, Goñi, Alejandro R., Bronstein, Hugo, McCulloch, Iain, Hayes, Sophia C., Campoy-Quiles, Mariano, Nelson, Jenny·2016·Nature Materials

DOI 10.1038/nmat4645

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Abstract

The specific optical absorption of an organic semiconductor is critical to the performance of organic optoelectronic devices. For example, higher light-harvesting efficiency can lead to higher photocurrent in solar cells that are limited by sub-optimal electrical transport. Here, we compare over 40 conjugated polymers, and find that many different chemical structures share an apparent maximum in their extinction coefficients. However, a diketopyrrolopyrrole-thienothiophene copolymer shows remarkably high optical absorption at relatively low photon energies. By investigating its backbone structure and conformation with measurements and quantum chemical calculations, we find that the high optical absorption can be explained by the high persistence length of the polymer. Accordingly, we demonstrate high absorption in other polymers with high theoretical persistence length. Visible light harvesting may be enhanced in other conjugated polymers through judicious design of the structure.

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Background
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Authors: Vezie, M. S., Few, S., Meager, I., Pieridou, G., Dörling, B., Ashraf, R. S., Goñi, A. R., Bronstein, H., McCulloch, I., Hayes, S. C., Campoy-Quiles, M., & Nelson, J.
Affiliations: Imperial College London (GB)
University of Cyprus (CY)
Institut de Ciència de Materials de Barcelona (ES)
Institució Catalana de Recerca i Estudis Avançats (ES)
University College London (GB)
Corresponding author: Nelson, Jenny
ORCID: Vezie, Michelle S.
Few, Sheridan
Dörling, Bernhard
Ashraf, Raja Shahid
Goñi, Alejandro R.
Bronstein, Hugo
McCulloch, Iain
Hayes, Sophia C.
Nelson, Jenny
Venue: Nature Materials
Publisher: Springer Science and Business Media LLC
Published: 2016-05-16
Volume: 15
Issue: 7
Pages: 746-753
ISSN: 1476-1122 (ISSN-L)
1476-4660
DOI: 10.1038/nmat4645
OpenAlex: W2347884365
Semantic Scholar: 40536d1ebaf206af965ab98470b1bdb20907c84f
Cited by: 387
References: 47
Citations by year: 2026: 14 · 2025: 38 · 2024: 30 · 2023: 40 · 2022: 43 · 2021: 45 · 2020: 51 · 2019: 33 · 2018: 40 · 2017: 46 · 2016: 7
FWCI: 19.37
Type: journal article
Language: en
Open access: green
hdl.handle.net
Licence: other-oa
www.springer.com/tdm (tdm)
www.springer.com/tdm (vor)
Locations: Nature Materials (publishedVersion)
PubMed (publishedVersion)
DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, other-oa)
UCL Discovery (University College London) (submittedVersion)
King Abdullah University of Science and Technology Repository (King Abdullah University of Science and Technology) (submittedVersion)
Spiral (Imperial College London) (submittedVersion)
Apollo (University of Cambridge) (submittedVersion)
Apollo
Funders: Engineering and Physical Sciences Research Council (EP/J017361/1, 1030430, 1226669, EP/K030671/1, EP/K029843/1, EP/J021199/1)
Topics: Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Electronics and Photovoltaics
Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Light-Emitting Diodes Research
Physical Sciences › Materials Science › Polymers and Plastics › Conducting polymers and applications
Keywords: conjugated polymers, optical absorption, extinction coefficient, persistence length, polymer backbone, chain conformation, oscillator strengths, visible light harvesting, organic solar cells, organic photodetectors, organic semiconductors

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Exploring the origin of high optical absorption in conjugated polymers

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