Thermally stable high performance non-fullerene polymer solar cells with low energy loss by using ladder-type small molecule acceptors |
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| Affiliation: | 1. College of Polymer Science & Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065 China;2. State Key Laboratory of Luminescent Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;3. School of Chemistry and Chemical Engineering, Sun Yat-sen University, No. 135, Road Xingangxi, GuangZhou 510275, China;1. School of Materials Science & Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61002, Republic of Korea;2. Institute for Solar and Sustainable Energies (RISE), Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61002, Republic of Korea;3. Department of Chemistry and Centre for Plastic Electronics, Imperial College London, Exhibition Rd, London, SW7 2AZ, UK;4. Department of Chemical Engineering and Materials Science, University of California-Irvine, Irvine, CA, 92697, United States;1. Institute of Organoelement Compounds of the Russian Academy of Sciences, Vavilova St., 28, 119991 Moscow, Russian Federation;2. Lomonosov Moscow State University, Faculty of Physics, 1-2 Leninskiye Gory, Moscow 119991, Russian Federation;3. R & D Center for Engineering and Science, JEC Group of Colleges, Jaipur Engineering College, Kukas, Jaipur 303101, India;4. Department of Photonics, National Chiao Tung University, Hsinchu, Taiwan 300, Taiwan, ROC;1. Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou 510640, China;2. State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China;1. Department of Physics, Pukyong National University, Busan 608-737, Republic of Korea;2. Department of Chemistry, Chemistry Institute for Functional Materials, Pusan National University, Busan 690-735, Republic of Korea;3. School of Biomedical Engineering, Inje University, Gimhae 50834, Republic of Korea;4. Department of Physics and EHSRC, University of Ulsan, Ulsan 680-749, Republic of Korea;5. Department of Industrial Chemistry, Pukyong National University, Busan 608-739, Republic of Korea |
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| Abstract: | Two ladder-type small molecule acceptors IDT-BT-R and IDT-BT-R-CN are utilized in non-fullerene polymer solar cells by pairing with PTB7-Th as donor polymer, in which PTB7-Th:IDT-BT-R solar cells achieve high performance up to 8.3% with high voltage of 1.02 V and low energy loss of 0.59 eV. Thermal annealing triggered local rearrangement of ladder-type molecules in n-type phases of bulk heterojunction films, increased their absorption abilities and electron transport properties, therefore resulting in improved short-circuit current densities (Jscs) and fill factors (FFs), in contrast to fullerene-based solar cells which suffered from extensive aggregation of fullerenes upon annealing. The outstanding thermal stability, high performance and low energy loss demonstrated here show great potential of non-fullerene polymer solar cells. |
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| Keywords: | Thermal stability Non-fullerene Polymer solar cells Low energy loss Ladder-type |
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