Visibly transparent conjugated polymers based on non-alternant cyclopenta-fused emeraldicene for polymer solar cells |
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| Affiliation: | 1. Institute of Polymer Science and Engineering, National Taiwan University, Taipei, 106, Taiwan;2. Institute of Chemistry, Academia Sinica, Taipei, 115, Taiwan;3. Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, 243, Taiwan;1. Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, P.za L. da Vinci, 32, 20133, Milano, Italy;2. Center for Nano Science and Technology @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133, Milano, Italy;1. Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing, 100044, China;2. Department of Electrical Engineering and Computer Science, University of Michigan-Ann Arbor, MI, 48105, USA;1. Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications (NUPT), 9 Wenyuan Road, Nanjing, 210023, China;2. Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China;1. Department of Chemistry, Queens University, Kingston, Ontario, Canada;2. Department of Physics, Engineering Physics and Astronomy, Queens University, Kingston, Ontario, Canada;3. Department of Chemistry and Chemical Engineering, Royal Military College, Kingston, Ontario, Canada;1. WuHan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China;2. Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing, 100044, China;3. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA |
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| Abstract: | In this study, we synthesized two emeraldicene (EMD)-based conjugated polymers, PBTEMD and PFEMD, through polymerization of 4,7-di(thien-2-yl)benzoc]1,2,5]thiadiazole and 9,9-bis(2-ethylhexyl)-9H-fluorene, respectively. We then blended these EMD-derived polymers (as electron-donating materials) with 6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) in the active layers of polymer solar cells (PSCs) and investigate their optoelectronic properties and related photovoltaic performance. To best of our knowledge, this study is the first to use EMD derivatives for PSC applications. We compared the molecular structures, absorption behavior, energy levels, thermal properties, and thermal stability of these two polymers to determine their suitability for use in PSCs. The main absorption of PFEMD was in the near-IR spectrum (600–800 nm). We observed a transparency of greater than 80% for the blend film of PFEMD having a thickness of 95 nm; the constructed device exhibited a power conversion efficiency (PCE) of 2.5% and the transparent PFEMD:PC61BM-derived device exhibited a PCE of 1.2% under AM 1.5 G irradiation (100 mW cm−2). We observed a significant improvement in thermal stability for the device incorporating the additive crosslinker TBT-N3; it retained approximately 60% of its initial PCE after accelerated heating (150 °C) for 18 h. In contrast, the PCE of the corresponding normal device decayed to 0.01% of its initial value. |
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| Keywords: | Emeraldicene Polymer solar cells High transparency Thermal stability Additive crosslinker |
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