ACS Photonics,
Journal Year:
2024,
Volume and Issue:
11(9), P. 3511 - 3520
Published: Sept. 4, 2024
Understanding
the
nature
of
photoexcitation
and
ultrafast
charge
dynamics
pathways
in
organic
halide
perovskite
nanocubes
their
aggregation
into
superlattices
is
key
for
potential
applications
as
tunable
light
emitters,
photon-harvesting
materials,
light-amplification
systems.
In
this
work,
we
apply
two-dimensional
coherent
electronic
spectroscopy
(2DES)
to
track
real
time
formation
near-infrared
optical
excitons
relaxation
CH(NH
ACS Nano,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 22, 2025
Twisted
halide
perovskite
bilayers,
a
type
of
moiré
material,
show
square
patterns
with
exciting
optical
properties.
Atomic-scale
structure
analysis
and
its
correlation
properties
are
difficult
to
achieve
due
the
extreme
sensitivity
organic–inorganic
perovskites
illuminated
electron
beam
in
conventional/scanning
transmission
microscopy.
Here,
we
developed
low-dose
exit
wave
reconstruction
methodology
real-space
resolution
one
angstrom
at
∼50
e/Å2,
which
recovers
phase
information
on
fringes
CH3NH3PbI3
(MAPbI3)
twisted
bilayers
atomic
scale,
enabling
detailed
structural
defects
corresponding
strain
distribution
such
materials.
This
work
provides
an
atomic-level
understanding
beam-sensitive
bilayer
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 30, 2024
Halide
perovskites
have
emerged
as
promising
materials
for
a
wide
variety
of
optoelectronic
applications,
including
solar
cells,
light-emitting
devices,
photodetectors,
and
quantum
information
applications.
In
addition
to
their
desirable
optical
electronic
properties,
halide
provide
tremendous
synthetic
flexibility
through
variation
not
only
chemical
composition
but
also
structure
morphology.
At
the
heart
use
in
technologies
is
interaction
light
with
excitations
form
excitons.
This
review
discusses
properties
behavior
excitons
perovskite
materials,
particular
emphasis
on
low-dimensional
effects
nanoscale
morphology
excitonic
behavior.
The
basic
theory
energy
migration
semiconductor
nanomaterials
introduced,
novel
observations
that
evolved
our
current
understanding
are
explored.
Finally,
many
important
questions
remain
unanswered
presented
exciting
emerging
directions
exciton
physics
discussed.
Applied Physics Letters,
Journal Year:
2025,
Volume and Issue:
126(3)
Published: Jan. 20, 2025
Periodic
stacking
of
two
van
der
Waals
materials
enables
the
realization
superlattice
structures
with
artificial
design
band
structure.
Two-dimensional
perovskites
offer
structural
flexibility
for
engineering
structure
that
can
result
in
structures.
Here,
InSe/BA2PbI4
perovskite
heterostructure
and
are
explored
by
first
principles
calculation.
Both
show
a
similar
direct
bandgap
As
concentration
VBA
defects
increases,
superlattices
generally
increase
different
manners
due
to
interfacial
interaction.
The
introduction
VI
leads
formation
type-I
alignment,
contrasting
type-II
alignment
resulting
from
defects.
These
findings
valuable
insights
into
defect-driven
modulation
electronic
properties
semiconductor
heterostructures,
providing
opportunities
tailor
them
various
optoelectronic
applications.
Applied Physics Letters,
Journal Year:
2025,
Volume and Issue:
126(10)
Published: March 1, 2025
Stacking
of
freestanding
membranes
enables
the
formation
interfaces
beyond
what
can
be
obtained
with
classical
heteroepitaxy.
In
particular,
twisted
provide
unique
physical
properties
not
existent
in
corresponding
individual
layers.
An
ideal
twist
grain
boundary
yields
an
in-plane
screw-dislocation
network,
assuming
sufficiently
strong
interactions
across
interface,
for
example,
via
covalent
or
ionic
bonding.
Hereby,
distance
between
dislocation
lines,
that
is
length
scale
Moiré
pattern,
set
by
angle
adjacent
crystalline
surfaces
and
lattice
mismatch
case
different
materials
are
placed
together.
The
associated
strain
gradients
periodic
pattern
especially
appealing
oxide-based
perovskites
due
to
intricate
connection
surface
polarization
subtle
structural
deformations
such
as
oxygen
octahedra
tilt.
Recently,
oxide
became
available
sacrificial
layer
approach,
opening
a
pathway
toward
materials.
Here,
we
demonstrate
efficient
bonding
SrTiO3
single-crystal
initially
conducting
wafer-bonding
process
at
high
temperature
only
subsequently
dissolving
layer.
We
investigate
SrTiO3/SrTiO3
interface
x-ray
diffraction
grazing
incidence
geometry
observe
clear
signatures
highly
lateral
superlattice
consistent
network.
Our
work
demonstrates
robust
route
fabrication
their
development
into
functional
material
platform
designed
nanoscale.
The Journal of Physical Chemistry Letters,
Journal Year:
2025,
Volume and Issue:
unknown, P. 3177 - 3184
Published: March 20, 2025
Herein,
novel
lead-free
Cs3Bi2I9
nanocrystals
(NCs)
were
preferred
through
first-principles
calculations
and
crystal
orbital
Hamilton
population
(COHP).
An
artificial
nociceptor
was
designed
using
the
halide
perovskite
(HP)
NCs
doped
into
poly(methyl
methacrylate)
(PMMA).
The
resulting
composite
material
memristor
demonstrated
remarkable
resistive
switching
performance
conductive
atomic
force
microscopy
(C-AFM).
PMMA&Cs3Bi2I9-based
memristors
show
an
ultrafast
speed
of
30
ns
low
threshold
voltage
≈0.6
V
with
little
variation,
which
attributed
to
synergistic
effect
active
metal
electrodes
vacancy
filaments.
Impressively,
high
mechanical
bending
stability
(bending
times
=
1000)
still
exhibit
excellent
resistance
state
(RS)
properties
multilevel
storage
after
days
exposed
ambient
conditions.
More
importantly,
fundamental
nociceptive
functions
fully
demonstrated.
Furthermore,
a
mechano-nociceptor
system
simulate
mechanism
biological
pain
perception,
could
selectively
react
mild
harmful
stimuli.
Our
study
provides
new
strategies
for
developing
efficient
neuromorphic
materials
devices.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 28, 2025
Abstract
Measuring
anisotropic
exciton
transport
in
organic
crystals
goes
beyond
just
assessing
one‐dimensional
(1D)
transport.
It
offers
a
deeper
understanding
of
how
molecular
packing
and
interactions
affect
different
dimensions.
However,
achieving
nanoscale
precision
measuring
lengths
linking
them
to
specific
crystalline
directions
remains
formidable
challenge.
Here
the
development
photoetching
method
is
reported
visualize
distances
as
gaps
within
two‐dimensional
(2D)
crystals,
which
turn
allows
for
use
scanning
electron
microscope
(SEM)
precisely
measure
sizes.
The
combined
with
hetero‐seeded
self‐assembly
enables
conventional
fluorescence
spectrometry
precise
determination
2D
structures
at
nanoscale.
Relying
on
this
novel
method,
unexpectedly
found
that
increasing
intermolecular
one
crystal
direction
not
only
improves
dimension
but
also
enhances
other
dimension.
These
findings
provide
valuable
insights
engineering
materials
require
efficient
across
extended
distances.
