Proceedings of Perovskite Thin Film Photovoltaics (ABXPV)
Publication date: 14th December 2015
Organic-inorganic hybrid perovskite solar cells (PSCs) have attracted the scientific community in the last few years due to their high performance produced by interesting physical effectsand low cost solutions. In spite of the spectacular advances in cell efficiency, many aspects of this system are poorly understood. One interesting phenomenon is the hysteresis response observed in current-voltage J-V curves upon illumination. The origin of these hysteresis cycles is unclear. There are several mechanisms that may explain it: ferroelectric polarization, ionic drift-diffusion migration, trapping and de-trapping mechanisms and capacitive effects [1].
It has been observed from experimental worksthat both, capacitive effects and ion migration influence the J−V response of PCSs[2]. However, the nonsteady-state photocurrent is dominated by the capacitive effects. From numerical simulations, the migration of ions and charge trapping and detrapping have been proposed as possible phenomena that explain the hysteresis behavior in J-V characteristics [3]. However, a time-dependent model for the capacitive effect is missing.
In this work, we propose a model for the capacitive effect. The model is based on the drift-diffusion transport equations including the ion charges at the bulk and at the perovskite/electrode interfaces. We describe how the applied voltage affects the ion density profile and how the dynamic accumulation of ions at the interface modifies the polarization at the electrodes, which give rise to the observed hysteresis behavior in PSCs.
1. Kirchartz, T.; Bisquert, J.; Mora-Sero, I. and Garcia-Belmonte G. Classification of solar cells according to mechanisms of charge separation and charge collection. Phys. Chem. Chem. Phys., 2015, 17, 4007.
2. Chen, B.; Yang, M.; Zheng, X.; Wu, C.; Li, W.; Yan, Y.; Bisquert, J.; Garcia-Belmonte, G. Zhu, K.; and Priya, S. Impact of Capacitive Effect and Ion Migration on the Hysteretic Behavior of Perovskite Solar Cells. J. Phys. Chem. Lett. 2015, 6, 4693−4700
3. Reenen, S.; Kemerink, M.; and Snaith, H.-J. Modeling Anomalous Hysteresis in Perovskite Solar Cells J. Phys. Chem. Lett. 2015, 6, 3808−3814
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