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Manipulating active layer morphology of molecular donor/polymer acceptor based organic solar cells through ternary blends

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Science China Chemistry 2018年第8期61卷 1025-1033页

作者： Zijian Zhang Zicheng Ding David J.Jones Wallace W.H.Wong Bin Kan Zhaozhao Bi Xiangjian Wan Wei Ma Yongsheng Chen Xiaojing Long ChuANDong Dou Jun Liu Lixiang Wang State Key Laboratory of polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China School of Chemistry Bio21 Institute the University of Melbourne Parkville Victoria 3010 Australia Key Laboratory for Functional polymer Materials and Centre for Nanoscale Science and Technology Institute of Polymer Chemistry College of Chemistry Nankai University Tianjin 300071 China Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China University of the Chinese Academy of Sciences Beijing 100049 China

The development of molecular donor/polymer acceptor blend(MD/PA)-type organic solar cells(OSCs) lags far behind other type OSCs. It is due to the large-size phase separation morphology of MD/PAblend, which results from the high crystallinity of molecular donors. In this article, to suppress the crystallinity of molecular donors, we use ternary blends to develop OSCs based on one polymer acceptor(P-BNBP-f BT) and two molecular donors(DR3 TBDTT and BTR) with similar chemical *** ternary OSC exhibits a power conversion efficiency(PCE) of 4.85%, which is higher than those of the binary OSCs(PCE=3.60% or 3.86%). To our best knowledge, it is the first report of ternary MD/PA-type OSCs and this PCE is among the highest for MD/PA-type OSCs reported so far. Compared with the binary blends, the ternary blend exhibits decreased crystalline size and improved face-on orientation of the donors. As a result, the ternary blend exhibits improved and balanced charge mobilities, suppressed charge recombination and increased donor/acceptor interfacial areas, which leads to the higher shortcircuit current density. These results suggest that using ternary blend is an effective strategy to manipulate active layer morphology and enhance photovoltaic performance of MD/PA-type OSCs.

关键词： organic solar cells molecular donor polymer acceptor blend morphology ternary blend

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