Synthesis,optical and electrochemical properties of pyridal[2,1,3]thiadiazole based organic dyes for dye sensitized solar cells |
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| Affiliation: | 1. The Institute for Advanced Studies, Wuhan University, Wuhan 430072, China;2. Department of Materials Science and Engineering, Monash University, Victoria, Australia;3. Australian Synchrotron, Clayton 3800, VIC, Australia;1. Department of Chemistry, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, Wuhan University, Wuhan 430072, China;2. Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan 430074, China;1. Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, China;2. Department of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, Stockholm 10691, Sweden |
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| Abstract: | The asymmetric nature of pyridal[2,1,3]thiadiazole (PyT), allows the synthesis of two isomers, series SC-PyTNn (n = 1–4) and SC-NPyTn (n = 1–6), where the nitrogen atom of PyT is positioned closer to the arylamine donor and the anchoring group, respectively. PyT derivatives have significant bathochromic shift of the electronic absorption compared to their 2,1,3-benzothiadiazole congeners. The short-circuit photocurrent density, open-circuit voltage and fill factor of DSSCs using the dyes as the sensitizers are in the range of 0.68–9.47 mA/cm−2, 0.43–0.61 V and 0.59–0.72, respectively. SC-NPyTn (n = 1–6) exhibited higher cell efficiencies than SC-PyTNn (n = 1–4). Power conversion efficiency of up to 4.24% was observed for SC-NPyT3. |
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| Keywords: | Pyridal[2,1,3]thiadiazole Donor–acceptor systems Dye-sensitized solar cells Metal-free sensitizers |
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