Proceedings of Online Meetup: Origins of Electronic Defects in Halide Perovskites (EDHP)
Publication date: 1st April 2020
Despite significant advances in perovskite solar cell (PSC) performance [1], there are still ongoing questions related to the ion migration, such as what the effects of the ions on PSCs are; which ions contribute to the degradation of PSCs and produce instabilities on the device performance; and which ions contribute to the outstanding performance of PSCs. In this work, we simulate the effect of the distribution of mobile ions in PSCs under illumination by solving the drift-diffusion transport equations [2-4]. We show the importance of considering ion migration to explain the accumulation of charge experimentally observed [2]. In addition, we show how the distribution of mobile ions modifies the band bending in the bulk and at the perovskite-ETL(HTL) interfaces. The incorporation of surface and bulk recombination shows how the electric field built at equilibrium by the ion concentration does not contribute as an additional corresponding ionic voltage, as it was observed in transient measurements [5]. We also show how dynamic hysteresis often attributed to trapping/de-trapping and redistribution of moving ions can be different if there is an imbalance of the type of mobile ion concentration [3]. Finally, we have observed that reducing the concentration of slow negative ions and/or the band offset could effectively reduce the hysteresis index and enhance the efficiency of the PSCs. All these results show the importance of considering simultaneously the ion migration, a realistic surface and bulk recombination and the different heterojunctions that constitute a PSC, in order to describe and optimize the performance of these devices.
[1] P. Lopez-Varo et al. Adv. Energy Mater. 2018, 1702772.
[2] M. García-Rosell et al. J. Phys. Chem. C 2018, 122, 25, 13920-13925
[3] Y. Huang et al. IEEE 46th Photovoltaic Specialists Conference (PVSC) 2019
[4] P. López-Varo, et al. ACS Energy Letters 1450-1453 (2017)
[5] R. Gottesman et al. Chem , 1, 776-789 (2016)
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