Molecular Design of D‐π‐A Type II Organic Sensitizers for Dye Sensitized Solar Cells |
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| Authors: | Shifeng Li Xichuan Yang Dingfeng Qu Weihan Wang Yu Wang Licheng Sun |
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| Institution: | 1. State Key Laboratory of Fine Chemicals, DUT‐KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), Dalian, Liaoning 116024, China;2. Department of Chemistry, Organic Chemistry, Royal Institute of Technology (KTH), Stockholm, 10044, Sweden |
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| Abstract: | Four new type II organic dyes with D‐π‐A structure (donor‐π‐conjugated‐acceptor) and two typical type II sensitizers based on catechol as reference dyes are synthesized and applied in dye sensitized solar cells (DSCs). The four dyes can be adsorbed on TiO2 through hydroxyl group directly. Electron injection can occur not only through the anchoring group (hydroxyl group) but also through the electron‐withdrawing group (? CN) located close to the semiconductor surface. Experimental results show that the type II sensitizers with a D‐π‐A system obviously outperform the typical type II sensitizers providing much higher conversion efficiency due to the strong electronic push‐pull effect. Among these dyes, LS223 gives the best solar energy conversion efficiency of 3.6%, with Jsc=7.3 mA·cm?2, Voc=0.69 V, FF=0.71, the maximum IPCE value reaches 74.9%. |
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| Keywords: | type II sensitizers D‐π ‐A photovoltaic devices solar cells |
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