Effect of side chains on phenanthrene based D-A type copolymers for polymer solar cells |
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| Affiliation: | 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. Department of Chemical Engineering, McMaster University, Hamilton, Ontario, L8S 4L7, Canada;2. Xerox Research Centre of Canada, 2660 Speakman Drive, Mississauga, Ontario, L5K 2L1, Canada;3. Department of Chemistry and Chemical Biology, MAX Diffraction Facility, McMaster University, Hamilton, Ontario, L8S 4L8, Canada;1. Department of Applied Science, National Taitung University, Taitung 950, Taiwan;2. Institute of Microelectronics, Department of Electrical Engineering, Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701, Taiwan;1. Department of Chemistry Education, Graduate Department of Chemical Materials and Institute for Plastic Information and Energy Materials, Pusan National University, Busan, 46241, Republic of Korea;2. Department of Fire Safety, Kyungil University, Gyeongsan 38428, Gyeongsangbuk-do, Republic of Korea;3. Divsion of Materials Science and Engineering, Pusan National University, Busan, 46241, Republic of Korea;1. Department of Engineering and Physics, Karlstad University, 65188 Karlstad, Sweden;2. Department of Physics, Humboldt-Universität zu Berlin, 12489 Berlin, Germany;3. Institute of Physics, University of Augsburg, 86135 Augsburg, Germany;1. Department of Organic and Nano Engineering, Hanyang University, Seoul, 133-791, Republic of Korea;2. Department of Textile Engineering, Mehran University of Engineering and Technology, Jamshoro, Pakistan;3. Research Institute of Industrial Technology Convergence Technical Textile and Materials R&D Group, Korea Institute of Industrial Technology (KITECH), 143 Hanggaulro, Sangnokgu, Ansan-si, Gyeonggi-do, 426-910, Republic of Korea;4. ICT Textile & Apparel R&D Group, Korea Institute of Industrial Technology (KITECH), 143 Hanggaulro, Sangnokgu, Ansan-si, Gyeonggi-do, 426-910, Republic of Korea;5. Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Republic of Korea |
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| Abstract: | 
A series of low band gap conjugated copolymers containing 9,10-modified phenanthrene and diketopyrrolopyrrole (DPP) units were synthesized as electron donor materials for bulk heterojunction organic solar cells. These donor-acceptor type PDPP copolymers have varying solubilizing groups on their identical conjugated backbones. The optical bandgap of PDPP copolymers is about 1.6 eV which corresponds to the long wavelength region of the solar spectrum. Through the incorporation of phenanthrene units into the conjugated backbone instead of commonly used thiophene derivatives, a higher open-circuit voltage of about 0.8 V could be achieved, as a result of their deeper HOMO level. Of all the devices, the P4:PC61BM BHJ system showed the best performance with a Voc of 0.79 V, a Jsc of 5.97 mA cm−2, a fill factor of 0.62 and a power conversion efficiency of 2.73% due to superior nanoscale phase separation between the electron donor and electron acceptor materials than in the other polymers arising from short-branched solubilizing groups on the phenanthrene side of its conjugated backbone. |
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| Keywords: | Conjugated polymer Organic semiconductor Polymer solar cells Phenanthrene Diketopyrrolopyrrole |
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