an9b01857_si_001.pdf (4.09 MB)
Controlling Quantum Confinement in Luminescent Perovskite Nanoparticles for Optoelectronic Devices by the Addition of Water
journal contribution
posted on 2020-01-17, 16:34 authored by Anna Jancik Prochazkova, Yolanda Salinas, Cigdem Yumusak, Markus Clark Scharber, Oliver Brüggemann, Martin Weiter, Niyazi Serdar Sariciftci, Jozef Krajcovic, Alexander KovalenkoHere,
a simple method for controlling the size of the perovskite
nanoparticles (PNPs) during preparation is reported. Metal halide
PNPs have great potential for application in optoelectronic devices,
such as light-emitting diodes, lasers, photodetectors, etc. They have
exceptionally high photoluminescence quantum yields (PLQYs) and exhibit
chemical tunability for versatile modifications of the perovskite
structural composition, enabling the synthesis of nanoparticles with
controlled size, shape, and optical properties. In this work, methylammonium
lead bromide PNPs were prepared using a hygroscopic stabilizing ligand,
tert-butoxycarbonyl-Lysine (tboc-Lysine). Water was used as an additive
in the precursor solution, which resulted in the formation of highly
mobile species and, thus, the nhancement of perovskite lattice growth.
This method allowed the preparation of PNPs with controlled size between
4 and 7 nm. The quantum confinement effect led to a fine-tuned optical
band gap of the nanoparticles. Increasing the amount of water added
from 0 to 32 mol equiv with respect to Lead(II) bromide (PbBr2) increased the PLQY to 70% in colloidal solutions and to
87% in thin films. Therefore, because of control over the size and
high luminescent yields, the above-mentioned nanoparticles are targeted
for use in optoelectronic devices.