Journal
ACS ENERGY LETTERS
Volume 5, Issue 10, Pages 3152-3158Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c01474
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Funding
- NWO Vidi grant [016.Vidi.179.005]
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2018M3D1A1058536]
- EPSRC [EP/P020194/1]
- EPSRC [EP/P020194/1] Funding Source: UKRI
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The bandgap tunability of mixed-halide perovskites makes them promising candidates for light-emitting diodes and tandem solar cells. However, illuminating mixed-halide perovskites results in the formation of segregated phases enriched in a single halide. This segregation occurs through ion migration, which is also observed in single-halide compositions, and whose control is thus essential to enhance the lifetime and stability. Using pressure-dependent transient absorption spectroscopy, we find that the formation rates of both iodide- and bromide-rich phases in MAPb(BrxI1-x)(3) reduce by 2 orders of magnitude on increasing the pressure to 0.3 GPa. We explain this reduction from a compression-induced increase of the activation energy for halide migration, which is supported by first-principle calculations. A similar mechanism occurs when the unit cell volume is reduced by incorporating a smaller cation. These findings reveal that stability with respect to halide segregation can be achieved either physically through compressive stress or chemically through compositional engineering.
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