Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO25)
Publication date: 24th April 2025
Halide perovskites are highly promising, emerging semiconductors for a variety of applications. Here I will delve into their nanoscale properties including the effect on macroscopic optoelectronic properties.
First, I will show quantum picosecond transients appearing in formamidinium-rich halide perovskite absorbers at low temperature. From correlative local measurements, we show that these quantum transients originate from local nano-twinning structures.
Next, I will show the presence of dynamic, lower-symmetry local nanodomains embedded within the higher-symmetry average phase in various perovskite compositions. The properties of these nanodomains are tunable via the A-site cation selection: methylammonium induces a high density of anisotropic, planar nanodomains of out-of-phase octahedral tilts, while formamidinium favours sparsely distributed isotropic, spherical nanodomains with in-phase tilting, even when crystallography reveals cubic symmetry on average. By demonstrating the influence of A-site cation on local nanodomains and consequently, on macroscopic properties, we show the connection between these local dynamic domains and optoelectronic properties.
Finally, I will show recent results of epitaxial, layer-by-layer growth of halide perovskites by vapour deposition, leading to a new library of high-quality materials.
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The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.