A two-dimension-conjugated small molecule for efficient ternary organic solar cells |
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| Affiliation: | 1. Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China;2. Jiangsu Key Laboratory for Carbon-Based Functional Materials & Device, Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China;1. Department of Physics and Astronomy and Optical Science and Technology Center, University of Iowa, Iowa City, IA, 52242, USA;2. Department of Physics and Astronomy, University of Wisconsin Eau Claire, Eau Claire, WI, 54702, USA;1. National Engineering Laboratory for TFT-LCD Material and Technologies, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan;1. Institute of Lighting and Energy Photonics, National Chiao-Tung University, Tainan 71150, Taiwan;2. Institute of Photonic System, National Chiao-Tung University, Tainan 71150, Taiwan;3. Department of Biomedical Engineering, Hungkuang University, Taichung City, 43302, Taiwan;4. Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan;1. Department of Physics, North-Eastern Regional Institute of Science and Technology, Nirjuli-791 109, Arunachal Pradesh, India;2. Department of Physics, Manipur University, Canchipur-795 003, Manipur, India;1. Department of Applied Physics, Eindhoven University of Technology, The Netherlands;2. Kavli Institute of Nanoscience, Delft University of Technology, The Netherlands |
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| Abstract: | Ternary organic solar cells (OSCs) are burgeoning as one of the effective strategies to achieve high power conversion efficiencies (PCEs) by incorporating a third component with a complementary absorption into the binary blends. In this study, we presented a new two-dimension-conjugated small molecule denoted by DR3TBDTTVT, which alone gave rise to a best PCE of 5.71% with acceptor PC71BM as active layer. Given the complementary absorption with PTB7-Th, DR3TBDTTVT was doped into (PTB7-Th:PC71BM)-based binary blends, and ternary OSCs were developed. The ternary OSCs with 10 wt% of DR3TBDTTVT displayed improved hole-mobility, reduced device resistance and better phase separation of active layer, thus leading to an impressive PCE of 7.77% with open-circuit voltage of 0.77 V, short-circuit density of 14.52 mA cm−2 and fill factor of 70.3%. Ternary OSCs well make up for the light-harvesting insufficiency of binary OSCs, and this research provides a new material for the improvement of PCEs for single-junction OSCs. |
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| Keywords: | Ternary organic solar cells DR3TBDTTVT PTB7-Th |
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