Abstract:
The optical and electronic properties of nanoparticles/
nanocrystals (NC) of methylammonium lead tribromide
perovskite (MAPbBr3) have been studied in detail. We observe the
effect of quantum confinement in particles of an average diameter
of ∼6 nm and smaller, in the form of an increase in excitonic
nature with decrease in particle size. The differences in the
photophysical properties in bulk and NC forms of MAPbBr3 are
clearly observed in the temperature dependent measurements, and
provide insight into the length scales prevalent in this system. We
demonstrate devices consisting of active layers of NC in
conjunction with low band gap polymer semiconductors which
exhibit the dual functionality of a light emitting diode in the forward bias and a photodetector in the reverse bias.graphic
