Unraveling Device Physics of Dilute-Donor Narrow-Bandgap Organic Solar Cells with Highly Transparent Active Layers
Schopp N. Akhtanova G. Panoy P. Arbuz A. Chae S. Yi A. Kim H.J. Promarak V. Nguyen T.-Q. Brus V.V.
August 4, 2022John Wiley and Sons Inc
Advanced Materials
2022#34Issue 31
The charge generation–recombination dynamics in three narrow-bandgap near-IR absorbing nonfullerene (NFA) based organic photovoltaic (OPV) systems with varied donor concentrations of 40%, 30%, and 20% are investigated. The dilution of the polymer donor with visible-range absorption leads to highly transparent active layers with blend average visible transmittance (AVT) values of 64%, 70%, and 77%, respectively. Opaque devices in the optimized highly reproducible device configuration comprising these transparent active layers lead to photoconversion efficiencies (PCEs) of 7.0%, 6.5%, and 4.1%. The investigation of these structures yields quantitative insights into changes in the charge generation, non-geminate charge recombination, and extraction dynamics upon dilution of the donor. Lastly, this study gives an outlook for employing the highly transparent active layers in semitransparent organic photovoltaics (ST-OPVs).
average visible transmittance , organic photovoltaics , recombination studies , semitransparent solar cells
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Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California Santa Barbara (UCSB), Santa Barbara, 93106, CA, United States
Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan City, 010000, Kazakhstan
Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand
Core Facilities, Office of the Provost, Nazarbayev University, Nur-Sultan City, 010000, Kazakhstan
Department of Organic Material Science and Engineering, School of Chemical Engineering, Pusan National University, Busan, 46241, South Korea
Center for Polymers and Organic Solids
Department of Physics
Department of Materials Science and Engineering
Core Facilities
Department of Organic Material Science and Engineering
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