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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.
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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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