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All-polymer solar cells with perylenediimide polymer acceptors
Authors:Yi-kun Guo  Yun-ke Li  Han Han  He Yan  Dahui Zhao
Institution:1. Beijing National Laboratory for Molecular Sciences, Center for the Soft Matter Science and Engineering and the Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry,Peking University, Beijing 100871, China;2. Department of Chemistry, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon,Hong Kong, China
Abstract:Four polymers based on perylenediimide co-polymerized with thiophene, bithiophene, selenophone and thieno3,2-b]thiophene were investigated as the acceptor materials in all-polymer solar cells. Two different donor polymers, poly4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo1,2-b;4,5-b′]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno3,4-b]thiophene)-2-carboxylate-2,6-diyl] (PTB7-Th) and poly(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3?-di(2-dodecyltetradecyl)-2,2′;5′,2″;5″,2?-quaterthiophen-5,5?-diyl)] (PffBT4T-2DT), with suitably complementary absorption spectra and energy levels were applied and examined. Among all different donor-acceptor pairs studied here, the combination of PTB7-Th:polyN,N′-bis(1-hexylheptyl)-3,4,9,10-perylenediimide-1,6/1,7-diyl-alt-2,5-thiophene] (PDI-Th) exhibited the best power conversion efficiency (PCE) of 5.13%, with open-circuit voltage (Voc) = 0.79 V, short-circuit current density (J sc = 12.35 mA·cm?2 and fill-factor (FF) = 0.52. The polymer of PDI-Th acceptor used here had a regio-irregular backbone, conveniently prepared from a mixture of 1,6- and 1,7-dibromo-PDI. It is also noteworthy that neither additive nor post-treatment is required for obtaining such a cell performance.
Keywords:All-polymer solar cells  Polymer acceptor  Perylenediimides  Donor-acceptor pair
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