The new precursors MAI3+x and FAI3+x exhibit exceptionally high reactivity towards lead precursors and result in high quality lead-halide perovskite films.
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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.