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Exploring the origin of high optical absorption in conjugated polymers
Open accessAbstract
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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“In general, rigid planar π-conjugated structures show remarkably high optical absorption, explained by the high persistence length of the polymer,168 and strong emission as isolated species.”
From The Pursuit of Shortwave Infrared-Emitting Nanoparticles with Bright Fluorescence through Molecular Design and Excited-State Engineering of Molecular Aggregates (2022) · cites this paper as [168]
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Namsheer, K., & Rout, C. S. (2021) · RSC Advances · doi:10.1039/d0ra07800j · Cited by 1,423
Yao, H., Cui, Y. Y., Yu, R., et al. (2017) · Angewandte Chemie International Edition · doi:10.1002/anie.201610944 · Cited by 811
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Metadata
- 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
- Venue
- Nature Materials
- Published
- 2016-05-16
- Volume
- 15
- Issue
- 7
- Pages
- 746-753
- ISSN
- 1476-1122 (ISSN-L)
- 1476-4660
- 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
- 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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