@article{Vezie:2016:10.1038/nmat4645,
author = {Vezie, M and Few, S and Meager, I and Pieridou, G and Dörling, B and Ashraf, RA and Goñi, AR and Bronstein, H and McCulloch, I and Hayes, SC and Campoy-Quiles, M and Nelson, J},
doi = {10.1038/nmat4645},
journal = {Nature Materials},
pages = {746--753},
title = {Exploring the origin of high optical absorption in conjugated polymers},
url = {http://dx.doi.org/10.1038/nmat4645},
volume = {15},
year = {2016}
}

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TY  - JOUR
AB  - 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.
AU  - Vezie,M
AU  - Few,S
AU  - Meager,I
AU  - Pieridou,G
AU  - Dörling,B
AU  - Ashraf,RA
AU  - Goñi,AR
AU  - Bronstein,H
AU  - McCulloch,I
AU  - Hayes,SC
AU  - Campoy-Quiles,M
AU  - Nelson,J
DO  - 10.1038/nmat4645
EP  - 753
PY  - 2016///
SN  - 1476-4660
SP  - 746
TI  - Exploring the origin of high optical absorption in conjugated polymers
T2  - Nature Materials
UR  - http://dx.doi.org/10.1038/nmat4645
UR  - http://hdl.handle.net/10044/1/33003
VL  - 15
ER  - 

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