Abstract
Front Cover: The synthesis, characterization, and photovoltaic properties of four new donor–acceptor copolymers, based on 4,4-difluoro-cyclopenta[2,1-b:3,4-b′]dithiophene as an acceptor unit and various donor moieties, are discussed. Linear octyl substituents promote the formation of ordered layered structures, while branched 2-ethylhexyl substituents lead to amorphous materials. Polymer solar cells based on these copolymers as donor and PC61BM as acceptor components yield a power conversion efficiency of 2.4%. Further details can be found in the article by Prof. S. A. Ponomarenko* and co-workers on page 2144.
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