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

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Tautz R,Da Como E,Limmer T,Feldmann J,Egelhaaf HJ,von Hauff E,Lemaur V,Beljonne D,Yilmaz S,Dumsch I,Allard S,Scherf U

doi

10.1038/ncomms1967

subject

Has Abstract

pub_date

2012-07-24 00:00:00

pages

970

issn

2041-1723

pii

ncomms1967

journal_volume

3

pub_type

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