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Title

Exploring the origin of high optical absorption in conjugated polymers

AuthorsVezie, Michelle S.; Dörling, Bernhard ; Goñi, Alejandro R. ; Campoy Quiles, Mariano ; Nelson, Jenny
KeywordsSolar-cells
Molecular-weight
Thin-films
Dependence
Disorder
Semiconductors
Enhancement
Transport
Mobility
Spectra
Issue DateJul-2016
PublisherNature Publishing Group
CitationNature Materials 15(7): 746–753 (2016)
AbstractThe 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 compared over 40 conjugated polymers, and found 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.
DescriptionVezie, Michelle S. et al.
Publisher version (URL)http://dx.doi.org/10.1038/nmat4645
URIhttp://hdl.handle.net/10261/147765
DOI10.1038/nmat4645
ISSN1476-1122
Appears in Collections:(ICMAB) Artículos
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