Solutions
of methylammonium and formamidinium polyhalides (AX1+n
, A = MA, FA, X = I, Br) in isopropanol
are introduced as novel versatile precursors for the fabrication of
APbX3 hybrid perovskite thin films via oxidation of metallic
Pb. The polyhalide solution with adjustable reactivity is distributed
over a metallic Pb layer followed by iodine vapor postprocessing to
tune the morphology and composition of the film using only the elements
inherently present in the perovskite. This method is easily reproducible
in any materials science laboratory with equipment commonly used for
perovskite solar cell fabrication and resulted in power conversion
efficiencies of 16.2 and 17.2% for planar solar cells using MAPbI3 and MA0.25FA0.75PbI2.75Br0.25 perovskites, respectively, as a proof of concept. Implementation
of metallic lead thin films as the single Pb-containing precursors
reduces a number of in-lab handling hazards compared to classical
PbI2 powder and solutions and provides a variety of scalable
deposition options.
A method has been developed for the preparation of Bi-Fe-Sb-O pyrochlore nanoparticles by microwave hydrothermal treatment. Experiments revealed that the preparation procedure for the precursors is an important factor that affects the phase composition of the product. The morphology of the pyrochlore particles was investigated by SEM, HRTEM, and se-
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