Boundary condition model for the simulation of organic solar cells |
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| Affiliation: | 1. Departamento de Electrónica y Tecnología de Computadores, CITIC-UGR, Facultad de Ciencias, Universidad de Granada, Granada, 18071, Spain;2. Department of Electrical and Computer Engineering, McMaster University, Hamilton, ON L8S 4K1, Canada;1. School of Materials Science and Engineering, University of Jinan, Jinan 250022, China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China;1. LPMS, Physics Department, Mentouri Brothers,Constantine1 University, 25000, Algeria;2. Higher National School of Biotechnology “Toufik Khaznadar” (ENSB), Constantine, Algeria;3. LEA, Department of Electronics, University of Batna2, Algeria;1. Research scholar, Madurai Kamaraj University, Madurai 625021, India;2. P.G. & Research Department of Physics, Govt. Arts College, Melur 625106, Madurai, India;3. Department of Chemical Engineering, College of Engineering, Kyung Hee University, 1732 Deogyeong-daero, Gihung, Yongin, Gyeonggi 446-701, South Korea;4. Grupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia;1. Department of Mechanical Engineering & Mechanics, Lehigh University, Bethlehem, PA 18015, USA;2. Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208, USA;3. Department of Physics & Astronomy, University of Wyoming, Laramie, WY 82071, USA;1. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan;2. Department of Chemical Engineering, Feng Chia University, Taichung, Taiwan;3. Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan;4. Center for Emergent Functional Matter Science, National Chiao Tung University, Hsinchu, Taiwan |
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| Abstract: | Organic solar cells (OSCs) are promising photovoltaic devices to convert solar energy into electrical energy. Their many advantages such as lightweight, flexibility and low manufacturing costs are intrinsic to the organic/polymeric technology. However, because the performance of OSCs is still not competitive with inorganic solar cells, there is urgent need to improve the device performance using better designs, technologies and models. In this work, we focus on developing an accurate physics-based model that relates the charge carrier density at the metal-organic boundaries to the current density in OSCs. This analysis is based on our previous studies on single-carrier and bipolar diodes. The model for the boundary condition of the charge carrier density at the interfaces of OSCs follows a power-law function with the current density, both in dark and under illumination. Simulated current-voltage characteristics are verified with experimental results. The numerical simulations of the current-voltage characteristics of OSCs consider well-established models for the main physical and optical processes that take place in the device: light absorption and generation of excitons, dissociation of excitons into free charge carriers, charge transport, recombination and injection-extraction of free carriers. Our analysis provides important insights on the influence of the metal-organic interfaces on the overall performance of OSCs. The model is also used to explain the anomalous S-shape current-voltage curves found in some experimental data. |
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| Keywords: | Organic solar cells Modeling Boundary conditions for simulation Charge carrier density at interfaces |
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