Electronically asymmetric poly(1,4-phenylenevinylene)s for photovoltaic cells |
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| Affiliation: | 1. Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, United Kingdom;2. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom;3. Division of Electronic Engineering and Physics, Faculty of Engineering and Physical Sciences, University of Dundee, Dundee DD1 4HN, United Kingdom;4. Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, North Haugh, Fife KY16 9SS, United Kingdom;5. Centre for Organic Photonics and Electronics, University of Queensland, Chemistry Building, St Lucia, Queensland 4072, Australia;1. Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, PR China;2. School of Physical Science and Electronics, Shanxi Datong University, Datong 037009, PR China;3. Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, PR China;4. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China;5. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China;6. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, PR China;1. Central Electrochemical Research Institute, Karaikudi 630 006, India;2. Academy of Scientific and Innovative Research (AcSIR), Chennai, India;3. Department of Chemistry, Ariel University Centre of Samaria, Ariel 440700, Israel;1. School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, South Korea;2. Electronics and Telecommunications Research Institute, Daejeon, 34129, South Korea;1. School of Physical Science and Technology, Southwest University, Chongqing 400715, PR China;2. Material Science and Engineering, Arizona State University, 7700 S. River Parkway, Tempe, AZ 85284, United States |
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| Abstract: | We report a study on the feasibility of using an intramolecular dipole to enhance charge separation for organic photovoltaic applications. We have developed a poly(1,4-phenylenevinylene) derivative, poly{2-[(9,9-di-n-propyl-9H-7-nitrofluoren-2-yl)]-5-(2-ethylhexyloxy)-1,4-phenylenevinylene} 12, which has electronically asymmetric chromophores as a result of the para attachment of alkoxy and nitrofluorenyl groups on the phenyl units of the polymer backbone. The luminescence of the polymer with the electronically asymmetric chromophores was found to be smaller by a factor of eight when compared to the equivalent polymer but without the nitro group attached to the fluorenyl unit. Light-induced electron spin resonance experiments showed that the polymer with the electronically asymmetric chromophores had more photo-induced spins, showing that the quenching of the luminescence was due to intramolecular charge separation. Single layer photovoltaic devices containing neat films of 12 showed efficiencies similar to other single layer devices and this was ascribed to poor transport of the separated charges. This was confirmed by a strong improvement in device power efficiency to 0.52% at AM1.5 by blending the polymer with an electron transporting material. |
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