In this work, we report two vacancy ordered perovskites based on Cs2ReX6 (X - Cl, Br) for stable solar water oxidation. Instability of halide perovskites in aqueous media restricts their...
Tuning the dimensionality in halide perovskites provides
an opportunity
to obtain the properties desired for optoelectronic devices. In this
work, we demonstrate the dimensional reduction of 3D halide double-perovskite
Cs2AgBiBr6 by systematically introducing alkylammonium
organic spacer CH3(CH2)
n
NH3
+ (n = 1, 2, 3, and
6) of varying chain lengths. The single crystals of these materials
were grown, and their structures were studied at 23 and −93
°C. The ethylammonium cation led to a formation of a 0D material,
whereas all the other three higher alkyl ammonium spacers resulted
in two-dimensional materials. The parent material possessed symmetric
octahedra, whereas the modified samples led to both inter- and intra-octahedral
distortion, thereby reducing the symmetry of constituent octahedra.
The reduction in dimensionality led to a blue shift in the optical
absorption spectrum. All these low-dimensional materials show excellent
stability, and they are employed as absorbers for solar photovoltaics.
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