Validation of opposed two-diode equivalent-circuit model for S-shaped characteristic in polymer photocell by low-light characterization |
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| Affiliation: | 1. Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;2. Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;3. Materials Chemistry Department, Institute of Inorganic Chemistry AS CR v.v.i., 25068 Řež, Czech Republic;4. Faculty of Environment, J.E. Purkyně University in Ústí nad Labem, Ústí nad Labem 400 96, Czech Republic;1. Department of Electronic Engineering, University of Rome “Tor Vergata”, 00133 Rome, Italy;2. Technische Universität München, Electrical Eng. and Information Tech., Arcisstr. 21, 80333 München, Germany;1. State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, People׳s Republic of China;2. Collaborative Innovation Center of Quantum Matter, Beijing 100084, People׳s Republic of China;1. Departamento de Física, Universidade Federal do Paraná, CP 19044, CEP 81531-990 Curitiba, PR, Brazil;2. Department of Applied Chemistry, University of Johannesburg, Doornfontein 2028, South Africa |
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| Abstract: | The opposed two-diode equivalent-circuit model consisting of a traditional one-diode photocell model and a parasitic diode with a parallel resistance is known to somehow reproduce the S-shaped current-voltage curve of poor organic photocells. Here, the light-intensity dependencies of the parameters in the model are experimentally studied. On the assumption that the parasitic part is light-insensitive, the parameters of the main part, which are extracted by fitting the current-voltage curves under various illumination intensities with the model, are found to change as those of healthy photocells do. The reasonable separation of light-sensitive main and light-insensitive parasitic parts validates the model. |
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| Keywords: | Photocell Equivalent-circuit model S-shaped curve Bulk heterojunction composites Indoor light harvesting Polymer |
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