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Yi Zhou, Kristofer Tvingstedt, Fengling Zhang, Chunxia Du, Wei-Xin Ni, Mats R. Andersson and Olle Inganäs Observation of a Charge Transfer State in Low-Bandgap Polymer/Fullerene Blend Systems by Photoluminescence and Electroluminescence Studies Advanced Functional Materials 19

Article first published online: 1 SEP 2009 | DOI: 10.1002/adfm.200900702

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Charge transfer (CT) states generated by the interaction between fullerene and two alternating copolymers are observed using photoluminescence (PL) and electroluminescence measurements. The CT state plays an important role in photocurrent generation, especially in the donor/acceptor blend of APFO-Green 9/PCBM, which has a small driving force of 0.1 eV. Competition between PL and photocurrent generation is visible in the PL quenching experiments under reverse bias.

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