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3 October 2022 Can organic solar cells surpass the Shockley-Queisser limit?
Martijn Kemerink
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Proceedings Volume PC12199, Physical Chemistry of Semiconductor Materials and Interfaces XXI; PC1219909 (2022) https://doi.org/10.1117/12.2635858
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States
Abstract
In a combined experimental/numerical study, we show that the slowness of charge carrier thermalization leads to a 0.1-0.2 eV higher open circuit voltage (Voc) in OPV devices than would be expected for instantaneous thermalization. The latter is commonly assumed when analyzing Voc of OPV devices. Second, we demonstrate numerically how this loss channel can be further mitigated in funnel-shaped morphologies of donor- and acceptor-rich domains to direct charge motion. We demonstrate that in optimized funnel morphologies this kinetic, non-equilibrium effect allows to surpass the Shockley-Queisser limit.
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Martijn Kemerink "Can organic solar cells surpass the Shockley-Queisser limit?", Proc. SPIE PC12199, Physical Chemistry of Semiconductor Materials and Interfaces XXI, PC1219909 (3 October 2022); https://doi.org/10.1117/12.2635858
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KEYWORDS
Solar cells
Organic photovoltaics
Numerical modeling
Heterojunctions
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