Perovskites are attracting an increasing interest in the wide community of photovoltaics, optoelectronic, and detection, traditionally relying on lead-based systems. This Minireview provides an overview of the current status of experimental and computational results available on Ge-containing 3D and lowdimensional halide perovskites. While stability issues analogous to those of tin-based materials are present, some strategies to afford this problem in Ge metal halide perovskites (MHPs) for photovoltaics have already been identified and successfully employed, reaching efficiencies of solar devices greater than 7 % at up to 500 h of illumination. Interestingly, some Gecontaining MHPs showed promising nonlinear optical responses as well as quite broad emissions, which are worthy of further investigation starting from the basic materials chemistry perspective, where a large space for properties modulation through compositions/alloying/fnanostructuring is present.
We report the synthesis and characterization of nanocrystals of a novel fully inorganic
lead-free zero-dimensional perovskite, Cs
4
SnBr
6
. Samples are made
of crystals with an average size of ∼20 nm with green emission centered around
530 nm. Interestingly, both colloidal suspensions and thin films show an enhanced air
stability with respect to that of any other previous tin-based nanocrystalline system,
with emission persisting for tens of hours under laboratory air.
The elucidation of the structure-property correlation in 2D metal halide perovskite is a key issue to understand the dependence of optical properties on structural distortions and to design novel tailored...
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