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Integrated Design of Organic Hole Transport Materials for Efficient Solid‐State Dye‐Sensitized Solar Cells |
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| Authors: | Bo Xu Haining Tian Lili Lin Deping Qian Hong Chen Jinbao Zhang Nick Vlachopoulos Gerrit Boschloo Yi Luo Fengling Zhang Anders Hagfeldt Licheng Sun |
| Institution: | 1. Organic Chemistry, Center of Molecular Devices, Department of Chemistry, School of Chemical Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden;2. Biomolecular and Organic Electronics, Department of Physics, Chemistry and Biology, Link?ping University, Link?ping, Sweden;3. College of Physics and Electronics, Shandong Normal University, Jinan, China;4. Department of Theoretical Chemistry & Biology, School of Biotechnology, KTH Royal Institute of Technology, Stockholm, Sweden;5. Berzelii Center EXSELENT on Porous Materials and Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden;6. Department of Chemistry‐?ngstr?m Laboratory, Physical Chemistry, Uppsala University, Uppsala, Sweden;7. State Key Laboratory of Fine Chemicals, DUT‐KTH Joint Research Center on Molecular Devices, Dalian University of Technology (DUT), Dalian, China |
| Abstract: | A series of triphenylamine‐based small molecule organic hole transport materials (HTMs) with low crystallinity and high hole mobility are systematically investigated in solid‐state dye‐sensitized solar cells (ssDSCs). By using the organic dye LEG4 as a photosensitizer, devices with X3 and X35 as the HTMs exhibit desirable power conversion efficiencies (PCEs) of 5.8% and 5.5%, respectively. These values are slightly higher than the PCE of 5.4% obtained by using the state‐of‐the‐art HTM Spiro‐OMeTAD. Meanwhile, transient photovoltage decay measurement is used to gain insight into the complex influences of the HTMs on the performance of devices. The results demonstrate that smaller HTMs induce faster electron recombination in the devices and suggest that the size of a HTM plays a crucial role in device performance, which is reported for the first time. |
| Keywords: | solid‐state dye‐sensitized solar cells hole transport materials oxidation potentials hole mobility molecular size |