Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 26, 2024
Abstract
In
this
study,
the
investigation
of
a
Cs
2
AgBiBr
6
single
crystal
(SC)
/
CsPbBr
3
nanocrystals
(NCs)
film
double
perovskite/perovskite
type‐II
novel
heterojunction
tailored
for
superior
X‐ray
detection
applications
is
presented.
One
main
benefits
utilizing
such
its
built‐in
electric
potential,
which
improves
charge
transport
and
reduces
dark
current
in
devices.
By
casting
NCs
onto
polished
SC,
/CsPbBr
perovskite/
perovskite
fabricated.
The
detector
exhibits
reduced
increased
photocurrent
compared
to
pristine
SC
device.
This
enhancement
can
be
attributed
efficient
carrier
generation
separation
facilitated
by
appropriate
band
bending
at
interface.
device
shows
an
sensitivity
µCGy
−1
cm
−2
0
V
applied
bias,
owing
potential
across
heterojunction.
Remarkably,
−50
reached
857.8
,
with
limit
312
nGy
s
.
Density
functional
theory
(DFT)
calculations
provided
further
insights,
revealing
electron
transfer
from
thereby
enhancing
These
findings
underscore
heterojunctions
optoelectronic
applications.
Nano-Micro Letters,
Journal Year:
2024,
Volume and Issue:
17(1)
Published: Sept. 30, 2024
Abstract
The
rapid
advancement
of
nanotechnology
has
sparked
much
interest
in
applying
nanoscale
perovskite
materials
for
photodetection
applications.
These
are
promising
candidates
next-generation
photodetectors
(PDs)
due
to
their
unique
optoelectronic
properties
and
flexible
synthesis
routes.
This
review
explores
the
approaches
used
development
use
devices
made
different
architectures,
including
quantum
dots,
nanosheets,
nanorods,
nanowires,
nanocrystals.
Through
a
thorough
analysis
recent
literature,
also
addresses
common
issues
like
mechanisms
underlying
degradation
PDs
offers
perspectives
on
potential
solutions
improve
stability
scalability
that
impede
widespread
implementation.
In
addition,
it
highlights
encompasses
detection
light
fields
dimensions
other
than
intensity
suggests
avenues
future
research
overcome
these
obstacles
fully
realize
state-of-the-art
systems.
provides
comprehensive
overview
guides
efforts
towards
improved
performance
wider
applicability,
making
valuable
resource
researchers.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(10), P. 12277 - 12288
Published: Feb. 29, 2024
Capitalizing
on
rapid
carrier
migration
characteristics
and
outstanding
photoelectric
conversion
performance,
halide
perovskite
memristors
demonstrate
an
exceptional
resistive
switching
performance.
However,
they
have
consistently
faced
constraints
due
to
material
stability
issues.
This
study
systematically
employs
elemental
modulation
dimension
engineering
effectively
control
with
different
dimensions
A-site
elements.
Compared
pure
3D
2D
perovskites,
the
quasi-2D
memristor,
specifically
BA0.15MA0.85PbI3,
is
identified
as
optimal
choice
through
observations
of
(HRS
current
<
10–5
A,
ON/OFF
ratio
>
103,
endurance
cycles
1000,
retention
time
104
s)
synaptic
plasticity
characteristics.
Subsequently,
a
comprehensive
investigation
into
various
aspects,
including
paired-pulse
facilitation
(PPF),
spike-variability-dependent
(SVDP),
spike-rate-dependent
(SRDP),
spike-timing-dependent
(STDP),
conducted.
Practical
applications,
such
memory–forgetting–memory
recognition
Modified
National
Institute
Standards
Technology
(MNIST)
database
handwritten
data
set
(accuracy
rate
reaching
94.8%),
are
explored
successfully
realized.
article
provides
good
theoretical
guidance
for
synaptic-like
simulation
in
memristors.
ACS Applied Nano Materials,
Journal Year:
2023,
Volume and Issue:
6(16), P. 14980 - 14990
Published: Aug. 7, 2023
We
report
a
facile,
solvent-free
surfactant-dependent
mechanochemical
synthesis
of
highly
luminescent
CsPbBr3
nanocrystals
(NCs)
and
study
their
scintillation
properties.
A
small
amount
surfactant
oleylamine
(OAM)
plays
an
important
role
in
the
two-step
ball
milling
method
to
control
size
emission
properties
NCs.
The
solid-state
synthesized
perovskite
NCs
exhibit
high
photoluminescence
quantum
yield
(PLQY)
up
88%
with
excellent
stability.
capped
different
amounts
were
dispersed
toluene
mixed
polymethyl
methacrylate
(PMMA)
polymer
cast
into
scintillator
discs.
With
increasing
concentration
OAM
during
synthesis,
PL
CsPbBr3/PMMA
nanocomposite
was
increased,
which
is
attributed
reduced
NC
aggregation
quenching.
also
varied
loading
studied
resulting
most
intense
observed
from
2%
perovskite-loaded
disc,
while
10%
loaded
disc
exhibited
highest
radioluminescence
(RL)
50
kV
X-rays.
strong
RL
may
be
deep
penetration
X-rays
composite,
combined
large
interaction
cross-section
high-Z
atoms
within
shows
peak
centered
at
536
nm
fast
decay
time
29.4
ns.
Further,
we
have
demonstrated
X-ray
imaging
performance
NC-loaded
disc.
Journal of Materials Chemistry A,
Journal Year:
2024,
Volume and Issue:
12(9), P. 5055 - 5079
Published: Jan. 1, 2024
We
use
the
term
“complex
metal
halides”
to
refer
compounds
such
as
halide
perovskites.
Our
focus
includes
exploring
various
dimensionality
types,
with
a
specific
emphasis
on
structurally
2D
materials,
including
RP
and
DJ
phases.
Nanoscale,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
The
hot
phonon
bottleneck
in
BA
2
PbBr
4
perovskite
and
MoS
heterostructure
extends
electron
relaxation,
offering
insights
into
interfacial
coupling
dynamics
for
efficient
optoelectronics.
Advanced Electronic Materials,
Journal Year:
2024,
Volume and Issue:
10(12)
Published: May 27, 2024
Abstract
In
this
work,
a
family
of
Ni‐based
dibenzotetraaza[14]annulene
(dtaa)
complexes
are
investigated
for
their
application
in
memristors
(memory
resistors).
A
series
four
Ni(II)
with
different
peripheral
substituents
the
dtaa
ligand
successfully
synthesized.
Based
on
these
compounds,
two‐terminal
thin‐film
devices
fabricated
planar
architecture.
Four
metals
work
functions
tested:
Mg,
Cu,
Ni,
and
Au.
It
is
demonstrated
that
ITO|[Ni(Me
4
dtaa)]|Cu
show
hysteretic
behavior
offer
stable,
robust,
reproducible
switching
between
high‐
low‐resistive
states.
An
in‐depth
spectroscopic
characterization
Ni
complex
performed,
using
radiation
from
infrared,
through
visible
ultraviolet,
to
tender
X‐rays.
Operando
X‐ray
fluorescence
spectroscopy
used
monitor
redox
structural
changes
upon
polarization
studied
memristor
external
electric
field.
Density
functional
theory
calculations
better
understand
electronic
structure
material,
as
well
rearrangement
after
electron
injection
may
be
responsible
modulation
conductivity.
Finding
unique
case
filamentary‐type
resistive
involving
reactions
stationary
molecules
within
molecular
solid
postulated.
Yet,
formation
filaments
not
related
any
significant
configurational
at
atomic
scale.
