Temperature and Light Modulated Open-Circuit Voltage in Nonfullerene Organic Solar Cells with Different Effective Bandgaps
Brus V.V. Schopp N. Ko S.-J. Vollbrecht J. Lee J. Karki A. Bazan G.C. Nguyen T.-Q.
January 27, 2021Wiley-VCH Verlag
Advanced Energy Materials
2021#11Issue 4
The relationship of the temperature–light intensity dependence of open-circuit voltage Voc in nonfullerene-based organic solar cells with their material characteristics and multimechanism recombination parameters is described. The systematic variation of the effective bandgap Eg,eff and the electrode layers allows the observation of different relative contributions of bimolecular, bulk, and surface trap-assisted recombination mechanisms. The complementary advantages of the analytical model and the established voltage-impedance spectroscopy technique provide a useful tool to quantify multimechanism recombination parameters, effective density of states Nc, and energetic disorder σ in organic solar cells under operating conditions. The validity of the proposed model to understand the temperature and light intensity dependent of Voc is shown by applying it to four different donor:nonfullerene acceptor blend systems with conventional or inverted device architectures.
charge recombination , open-circuit voltage–light intensity , organic solar cells , temperature
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Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, 93 106, CA, United States
Department of Physics, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 34114, South Korea
Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, 34134, South Korea
Center for Polymers and Organic Solids
Department of Physics
Division of Advanced Materials
Department of Chemical Engineering and Applied Chemistry
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