Effect of Light Cycling on Perovskite Solar Cells Stability
Perovskite solar cells (PSCs) have reached efficiencies necessary for commercial implementation; the technology is now looking to meet stability requirements. Many factors are known to influence device stability, among which light/dark cycling and bias condition during aging are in the focus of this report.
We performed indoor and outdoor stability studies on PSCs with different architectures and observed a profound impact of night-time recovery on the PSC lifetime. The PCE is found to increase in the dark if it was degrading under light and vice versa. Both behaviors were demonstrated previously and are not unique for a specific device.1,2 For the sake of comparing the stability of solar cells independently of their dynamic in the day-night cycle, we suggested new universal figures of merit for stability evaluation.3 We further investigated complex recovery dynamics of PSCs photo-degraded to a different extent4, which allowed separating reversible and irreversible processes, as well as “apparently irreversible” ones (coined for the processes with recovery time exceeding one night). Based on our findings we strongly suggest including light cycling test to the stability evaluation routing for perovskite PV.
References
1Domanski, K., Roose, B., Matsui, T., Saliba, M., Turren-Cruz, S.-H., et al. Energy Environ. Sci. (2017), 10 (2), 604–613.
2Huang, F., Jiang, L., Pascoe, A. R., Yan, U. Bach et al. Nano Energy (2016), 27, 509–514.
3Khenkin, M. V., A. K. M, Visoly-Fisher, I., Galagan, Y., Giacomo, F. D., et al. Energy Environ. Sci. (2018), 11 (4), 739–743.
4Khenkin, M. V., K. M., A., Visoly-Fisher, I., Kolusheva, S., Galagan, Y., et al. ACS Appl. Energy Mater. (2018), 1 (2), pp 799–806.
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