Document Detail

Structural correlations in the generation of polaron pairs in low-bandgap polymers for photovoltaics.
MedLine Citation:
PMID:  22828630     Owner:  NLM     Status:  In-Data-Review    
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.
Raphael Tautz; Enrico Da Como; Thomas Limmer; Jochen Feldmann; Hans-Joachim Egelhaaf; Elizabeth von Hauff; Vincent Lemaur; David Beljonne; Seyfullah Yilmaz; Ines Dumsch; Sybille Allard; Ullrich Scherf
Publication Detail:
Type:  Journal Article     Date:  2012-07-24
Journal Detail:
Title:  Nature communications     Volume:  3     ISSN:  2041-1723     ISO Abbreviation:  Nat Commun     Publication Date:  2012  
Date Detail:
Created Date:  2012-07-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101528555     Medline TA:  Nat Commun     Country:  England    
Other Details:
Languages:  eng     Pagination:  970     Citation Subset:  IM    
Photonics and Optoelectronics Group, Department of Physics and CeNS Ludwig-Maximilians-Universität München, 80799 Munich, Germany.
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