2 research outputs found
Self-Assembled PbSe Nanowire:Perovskite Hybrids
Inorganic semiconductor nanowires
are of interest in nano- and
microscale photonic and electronic applications. Here we report the
formation of PbSe nanowires based on directional quantum dot alignment
and fusion regulated by hybrid organicāinorganic perovskite
surface ligands. All material synthesis is carried out at mild temperatures.
Passivation of PbSe quantum dots was achieved via a new perovskite
ligand exchange. Subsequent <i>in situ</i> ammonium/amine
substitution by butylamine enables quantum dots to be capped by butylammonium
lead iodide, and this further drives the formation of a PbSe nanowire
superlattice in a two-dimensional (2D) perovskite matrix. The average
spacing between two adjacent nanowires agrees well with the thickness
of single atomic layer of 2D perovskite, consistent with the formation
of a new self-assembled semiconductor nanowire:perovskite heterocrystal
hybrid
Colloidal Quantum Dot Photovoltaics Enhanced by Perovskite Shelling
Solution-processed quantum dots are
a promising material for large-scale, low-cost solar cell applications.
New device architectures and improved passivation have been instrumental
in increasing the performance of quantum dot photovoltaic devices.
Here we report photovoltaic devices based on inks of quantum dot on
which we grow thin perovskite shells in solid-state films. Passivation
using the perovskite was achieved using a facile solution ligand exchange
followed by postannealing. The resulting hybrid nanostructure created
a more intrinsic CQD film, which, when incorporated into a photovoltaic
device with graded bandstructure, achieved a record solar cell performance
for single-step-deposited CQD films, exhibiting an AM1.5 solar power
conversion efficiency of 8.95%