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King, Simon ; Sommer, Michael ; Hüttner, Sven ; Thelakkat, Mukundan ; Haque, Saif A.:
Charge separation and recombination in self-organizing nanostructured donor-acceptor block copolymer films.
In: Journal of Materials Chemistry.
Bd. 19
(2009)
Heft 30
.
- S. 5436-5441.
ISSN 1364-5501
DOI: https://doi.org/10.1039/B905708K
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Abstract
A series of donor-acceptor diblock copolymers with varying molecular weight are studied in thin film and compared with an 'equivalent' blend formed from donor and acceptor homopolymers. Steady-state and transient spectroscopies are used to demonstrate a correlation between low molecular weight block copolymers and increased photoluminescence quenching (up to 99) leading to higher yields of long-lived free charges. Such block copolymers are shown, by electron microscopy, to exhibit phase-segregated micrdomains whose size and periodicity are determined by their molecular weight. Photovoltaic devices made using these materials show a peak efficiency of 0.11 and correlate with our spectroscopic results, subject to a trade-off between charge generation and tranpsort/collection.