  A facile, low-temperature precipitation-based method is utilized to
demonstrate the synthesis of ultra-thin and highly-uniform cesium lead bromide
perovskite nanowires (NWs). The reactions facilitate the NWs crystalline nature
over micron-size lengths, while they impart tailored nanowire widths that range
from the quantum confinement regime (~ 7 nm) and down to 2.6 nm. This colloidal
synthesis approach is the first of its kind that is carried out on the
work-bench, without demanding chemical synthesis equipment. Importantly, the
NWs photoluminescence is shown to become improved over time, with no tedious
post-synthesis surface treatment requirement.
