Research

Structural correlations in the generation of polaron pairs in low-bandgap polymers for photovoltaics


Reference:

Tautz, R., Da Como, E., Limmer, T., Feldmann, J., Egelhaaf, H.-J., Von Hauff, E., Lemaur, V., Beljonne, D., Yilmaz, S., Dumsch, I., Allard, S. and Scherf, U., 2012. Structural correlations in the generation of polaron pairs in low-bandgap polymers for photovoltaics. Nature Communications, 3, 970.

Related documents:

This repository does not currently have the full-text of this item.
You may be able to access a copy if URLs are provided below. (Contact Author)

Official URL:

http://dx.doi.org/10.1038/ncomms1967

Related URLs:

Abstract

Polymeric semiconductors are materials where unique optical and electronic properties often originate from a tailored chemical structure. This allows for synthesizing conjugated macromolecules with ad hoc functionalities for organic electronics. In photovoltaics, donor–acceptor co-polymers, with moieties of different electron affinity alternating on the chain, have attracted considerable interest. The low bandgap offers optimal light-harvesting characteristics and has inspired work towards record power conversion efficiencies. Here we show for the first time how the chemical structure of donor and acceptor moieties controls the photogeneration of polaron pairs. We show that co-polymers with strong acceptors show large yields of polaron pair formation up to 24% of the initial photoexcitations as compared with a homopolymer (η=8%). π-conjugated spacers, separating the donor and acceptor centre of masses, have the beneficial role of increasing the recombination time. The results provide useful input into the understanding of polaron pair photogeneration in low-bandgap co-polymers for photovoltaics.

Details

Item Type Articles
CreatorsTautz, R., Da Como, E., Limmer, T., Feldmann, J., Egelhaaf, H.-J., Von Hauff, E., Lemaur, V., Beljonne, D., Yilmaz, S., Dumsch, I., Allard, S. and Scherf, U.
DOI10.1038/ncomms1967
Related URLs
URLURL Type
http://dx.doi.org/10.1038/ncomms1967Free Full-text
DepartmentsFaculty of Science > Physics
RefereedYes
StatusPublished
ID Code31377

Export

Actions (login required)

View Item