Charge separation and recombination in self-organizing nanostructured donor-acceptor block copolymer films

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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.