Photovoltaic device performance of highly regioregular fluorinated poly(3-hexylthiophene) |
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| Affiliation: | 1. Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS B3H 4R2, Canada;2. Department of Chemistry, Université Laval, Quebec City, Quebec, G1V 0A6, Canada;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, People''s Republic of China;2. Co-Innovation Center for Micro/Nano Optoelectronic Materials and Devices, Research Institute for New Materials and Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People''s Republic of China;1. College of Electrical and Information Engineering, Shaanxi University of Science and Technology, Xi''an, 710021, PR China;2. Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi''an Jiaotong University, Xi''an, 710049, PR China;3. School of Electrical Engineering, Xi''an Jiaotong University, Xi''an, 710049, PR China;1. Universidade Estadual Paulista (UNESP), POSMAT - Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, Faculdade de Ciências, Bauru, Brazil;2. Universidade Estadual Paulista (UNESP), Câmpus Experimental de Itapeva, Brazil;3. Instituto Tecnológico de Aeronáutica, Divisão de Ciências Fundamentais, Departamento de Física, Campus CTA, São José dos Campos, São Paulo, Brazil;4. EMPA, Laboratory for Functional Polymers, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland;5. Universidade Estadual Paulista (UNESP), Faculdade de Ciências, Bauru, Brazil;1. School of Science, China University of Petroleum (East China), Qingdao, 266580, China;2. College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, China;1. Key Laboratory of Interface Science and Engineering in Advanced Materials (Ministry of Education), Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan, 030024, China;2. Department of Organic Device Engineering, Graduate School of Science and Engineering, Research Center for Organic Electronics (ROEL), Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata, 992-8510, Japan;3. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun, 130012, China |
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| Abstract: | Highly regioregular poly(3-hexylthiophene) derivatives with varying degrees of fluorine substitution on the thiophene moieties have been demonstrated in photovoltaic devices and characterized using ultraviolet and inverse photoelectron spectroscopy. As fluorine content is increased, an increase in ionization energy of 0.3 eV is observed for 50% fluorination compared to non-fluorinated poly(3-hexylthiophene). The electron affinity is observed to increase to a lesser extent with increased fluorination, consistent with a systematic increase in the optical bandgaps of up to 0.12 eV. Bulk heterojunction photovoltaic devices made from polymer:PC61BM blends achieve power conversion efficiencies of 3%, however film morphologies measured using atomic force microscopy indicate that strong phase separation with increasing fluorination limits device performance. UV–vis spectra of thin films of the fluorinated materials exhibit a long tail in the red, extending to longer wavelengths than non-fluorinated poly(3-hexylthiophene). Photovoltaic devices similarly exhibit non-zero quantum efficiency in this region. This behavior has been attributed to a low energy, interchain charge transfer state. |
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| Keywords: | Fluorine P3HT Polymer Photovoltaic Bulk heterojunction |
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