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Hyojung Cha, Dae Sung Chung, Suk Young Bae, Min-Jung Lee, Tae Kyu An, Jihun Hwang, Kyung Hwan Kim, Yun-Hi Kim, Dong Hoon Choi and Chan Eon Park Complementary Absorbing Star-Shaped Small Molecules for the Preparation of Ternary Cascade Energy Structures in Organic Photovoltaic Cells Advanced Functional Materials 23

Version of Record online: 23 OCT 2012 | DOI: 10.1002/adfm.201201913

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Two anthracene-based star-shaped conjugated small molecules, HBantHBT and BantHBT, are incorporated into organic photovoltaic cells prepared using a poly((5,5-E-alpha-((2-thienyl)methylene)-2-thiophene acetonitrile-alt-2;6-[(1,5-didecyloxy) naphthalene])): [6,6]-phenyl-C71-butyric acid methyl ester (PBTADN:PC71BM) blend as a electron-cascade donor material. The small molecules penetrate the PBTADN:PC71BM blend layer to yield complementary light absorption spectra, facilitate energy level alignment, and optimize the domain size required for charge carrier transfer.

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