Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 12, Pages 13431-13437Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c03095
Keywords
perovskite; ion migration; phase segregation; mixed halide; transient ion drift; activation energy; halide; methylammonium
Funding
- NWO Vidi Grant [016.Vidi.179.005]
- EPSRC International Centre to Centre grant [EP/S030638/1]
- NWO Project [15PR3202]
- NWO
- European Research Council (ERC) [947221]
- EPSRC [EP/S030638/1] Funding Source: UKRI
- European Research Council (ERC) [947221] Funding Source: European Research Council (ERC)
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The study investigates the ion migration process in methylammonium-based mixed-halide perovskites with varying ratios of bromide to iodide, revealing lower activation energies and higher density of mobile ions compared to pure-halide perovskites. Under illumination, the concentration of mobile halide ions further increases and a migration process involving methylammonium cations emerges, providing insights for designing bandgap-tunable perovskite solar cells with long-term stability.
Halide alloying in metal halide perovskites is a useful tool for optoelectronic applications requiring a specific bandgap. However, mixed-halide perovskites show ion migration in the perovskite layer, leading to phase segregation and reducing the long-term stability of the devices. Here, we study the ion migration process in methylammonium-based mixed-halide perovskites with varying ratios of bromide to iodide. We find that the mixed-halide perovskites show two separate halide migration processes, in contrast to pure-phase perovskites, which show only a unique halide migration component. Compared to pure-halide perovskites, these processes have lower activation energies, facilitating ion migration in mixed versus pure-phase perovskites, and have a higher density of mobile ions. Under illumination, we find that the concentration of mobile halide ions is further increased and notice the emergence of a migration process involving methylammonium cations. Quantifying the ion migration processes in mixed-halide perovskites shines light on the key parameters allowing the design of bandgap-tunable perovskite solar cells with long-term stability.
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