Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
The easy bandgap tunability of mixed-halide perovskite makes them promising candidate for color-tunable LEDs and tandem solar cells. However, illuminating the material results in formation of halide-segregated phases. Similarly, single-halide compositions suffer of halide migration. Activation energies reported for the two processes are comparable. Using pressure-dependent transient absorption spectroscopy, we find that the formation rates of both the iodide- and bromide-rich phases in MAPb(BrxI1-x)3 (x = 0.25, 0.5 and 0.7) reduce an order of magnitude on increasing the pressure to 0.3 GPa. We interpret this as a compression-induced change in the activation energy for ion migration, which is supported by theoretical calculations. The same mechanism is in place when mixed-cation perovskites are used because they also reduce the unit cell size. These findings suggest that chemically tuning the unit cell at ambient conditions may increase the activation energy for ion migration/phase segregation.
The work of L.A.M., E.M.H., F.W., J.V., H.B. and B.E. is part of the Dutch Research Council (NWO) and was performed at the research institute AMOLF.
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