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HL: Fachverband Halbleiterphysik
HL 50: Perovskite and photovoltaics IV (joint session HL/CPP)
HL 50.6: Vortrag
Mittwoch, 18. März 2020, 16:45–17:00, POT 251
On the Radiative Recombination Efficiency and Carrier Lifetime in Halide Perovskite Solar Cell Materials — •Thomas Unold1, Martin Stolterfoht2, Jose Marquez-Prieto1, Dieter Neher2, and Thomas Kirchartz3 — 1Helmholtz-Zentrum Berlin — 2Institute of Physics and Astronomy, Universität Potsdam — 3Forschungszentrum Juelich GmbH
The open-circuit voltage, which is currently considered the main performance limitation of halide perovskite solar cells, is determined by bulk and interface recombination processes in the solar cell.[1] Under ideal conditions the open-circuit voltage approaches the internal quasi-Fermi level splitting (QFLS), which may be estimated by the measurement of the external photoluminescence quantum yield (PLQY) and the absorption properties.[2] The photoluminescence quantum yield and quasi-Fermi level splitting can also be estimated by measurement of the time-resolved photoluminescence (TRPL), if the radiative recombination constants and photon recycling are taking into account properly.[3] A survey of the literature shows that the reported PLQY for measured open-circuit voltages sometimes vary by orders of magnitude, which is difficult to understand from the point of theory. In this contribution we show that careful consideration of the above points leads to a consistent picture of the interrelation of the QFLS, PLQY and TRPL lifetime, and discusses possible sources of error in the analysis. [1] Stolterfoht et al., Nature Energy 3 (2018) 847 [2] Liu et al., ACS Energy Lett. 4 (2019) 110 [3] Staub et al., Phys. Rev. Appl. 6 (2016) 044017