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Masashi Tsuji, Akinori Saeki, Yoshiko Koizumi, Naoto Matsuyama, Chakkooth Vijayakumar and Shu Seki Benzobisthiazole as Weak Donor for Improved Photovoltaic Performance: Microwave Conductivity Technique Assisted Molecular Engineering Advanced Functional Materials 24

Article first published online: 17 JUL 2013 | DOI: 10.1002/adfm.201301371

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Benzobisthiazole (BBTz), commonly an acceptor unit in low-bandgap polymers of organic photovoltaics, is used as weak donor and polymerized with benzothiadiazole (BT). The BBTz-BT copolymers exhibit deep HOMO (–5.7 eV) and 3.8% power conversion efficiency in an inverted cell. Xe-flash time-resolved microwave conductivity is shown to be a versatile tool for decision-making on the molecular design strategy.

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