Towards improved efficiency of bulk-heterojunction solar cells using various spinel ferrite magnetic nanoparticles |
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| Affiliation: | 1. Brno University of Technology, Faculty of Chemistry, Materials Research Centre, Purkyňova 118, 612 00, Brno, Czech Republic;2. Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, 109, Acad. G. Bontchev Str., P.O. Box 95, 1113, Sofia, Bulgaria;1. Department of Physics, Loyola College, Chennai, 600 034, India;2. Department of Physics, Ramakrishna Mission Vivekananda College, Chennai, 600 004, India;3. PG Department of Physics, Women’s Christian College, Chennai, 600 006, India;4. Department of Physics, B.S. Abdur Rahman University, Chennai, 600 048, India;1. Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic;2. Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, 616 00 Brno, Czech Republic;3. Groupe d‘Étude de la Matière Condensée (GEMaC), CNRS/Université de Versailles, 45, avenue des États-Unis, 78035 Versailles CEDEX, France;1. Department of Physics, G.V.P. College of Engineering for Women, Andhra Pradesh, Visakhapatnam, 530041, India;2. Department of Chemistry, Vasyl Stefanyk Precarpathian National University, 57, Shevchenko Str., Ivano-Frankivsk, 76018, Ukraine;3. Educational and Scientific Center of Materials Science and Nanotechnology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine;1. Department of Polymer Engineering, Pukyong National University, Busan, 48547, South Korea;2. Department of Materials Chemistry and Engineering, Konkuk Univerisity, Seoul, 05029, South Korea |
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| Abstract: | A detailed study of organic solar cells (OSC) doped with various ferromagnetic and superparamagnetic (Fe3O4, ZnFe2O4 NiFe2O4) nanoparticles (MNPs) is presented. Additionally to previously used magnetite nanoparticles, various magnetic moment spinel ferrites were applied. By impedance spectroscopy (IS) analysis it is shown how the doping with various MNPs influences solar cells' performance by the charge carrier effective lifetime extension. In this regard, we introduced a convenient illustrative method to define time constants from the impedance measurements. It is also shown that, photovoltaic performance of the solar cells directly depends on the magnetic moment and alignment of the superparamagnetic single-domain MNPs. Alignment of the MNPs within the OSCs' active layer results in MNPs dipole-dipole interaction, thus further-improves photovoltaic performance due to efficient charge collection at the short-circuit condition. OSC doping with ferromagnetic MNPs showed negative influence on the device performance, however in dark conditions, devices doped with CoFe2O4 showed higher forward current presumably due to leakage current through the large MNP aggregation or electron-polaron hopping. |
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| Keywords: | Organic solar cells Magnetic nanoparticles External magnetostatic field Spinel ferrite Impedance spectroscopy |
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