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Faculty for Biology, Chemistry, and Earth Sciences

Macromolecular Chemistry I:

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Sommer, M.; Hüttner, S.; Steiner, U.; Thelakkat, M.: Influence of molecular weight on the solar cell performance of double-crystalline donor-acceptor block copolymers, Applied Physics Letters, 95(18), 183308 (2009) -- DOI: 10.1063/1.3257367
We investigate the influence of the molecular weight of double-crystalline donor-acceptor block copolymers comprised of poly(3-hexylthiophene) as donor and poly(perylene bisimide acrylate) as acceptor segments on the device performance of polymer solar cells. Two block copolymers 1 and 2 exhibiting different molecular weights but the same composition are compared. Block copolymer 2 with the higher molecular weight shows an improvement in the hole carrier mobility mu(OFET) of more than two orders of magnitude, and an improvement in the external quantum efficiency of one order of magnitude reaching 31%, which is the highest reported value for a block copolymer system.
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