Applied Physics Letters,
Journal Year:
2024,
Volume and Issue:
125(19)
Published: Nov. 4, 2024
Ga2O3
has
been
considered
as
one
of
the
most
suitable
materials
for
x-ray
detection,
but
its
detection
performance
is
still
at
a
low
level
due
to
limitation
quality
and
absorbance,
especially
hard
x-ray.
In
this
work,
effects
growth
temperature
miscut
angle
sapphire
substrate
on
crystal
thin
films
were
investigated
based
MOCVD
technique.
It
was
found
that
mode
transformed
from
island
step-flow
using
substrates
increasing
temperature,
which
accompanied
by
improvement
reduction
density
trapped
states.
with
optimal
finally
prepared
4°
900
°C.
The
detector
film
shows
good
response
sensitivity
3.72
×
105μC·Gyair−1·cm−2.
Furthermore,
impacts
trap
in
depth,
mechanism
photoconductive
gain
thin-film
analyzed.
Abstract
Nanostructured
scintillators,
renowned
for
their
exceptional
miniaturization
and
portability,
are
typically
designed
with
homogeneous
dopant
ion
concentration
profiles.
While
these
profiles
facilitate
consistent
optical
properties,
they
may
pose
challenges
in
terms
of
compromising
light
emission
intensity
overall
scintillation
efficiency.
A
pressing
issue
the
field
X‐ray
flat‐panel
minidetectors
is
lack
specific
innovative
strategies
to
significantly
enhance
radioluminescence
capabilities,
which
has
hindered
further
advancements.
This
research
showcases
an
efficacious
strategy
synthesizing
ligand‐exchange‐passivated
mixed‐halide
double
perovskite
nanocrystals
(NCs)
tailored
remarkable
capabilities.
The
composition
fine‐tuned
via
anion
exchange
between
Bi
3+
Tb
‐doped
Cs
2
AgInCl
6
NCs
potassium
bromide
(KBr).
Additionally,
initial
oleic
acid
ligands
substituted
1‐dodecanethiol
(1‐DT),
effectively
compensating
inherent
halogen
vacancies
mitigating
halide
migration.
underlying
passivation
mechanism
elucidated
through
a
comprehensive
approach
that
combined
spectroscopic
experiments
theoretical
calculations.
Consequently,
fabricated
transparent
scintillator
films,
incorporating
synthesized
NCs,
exhibit
high
yield
≈20
952
photons
MeV
−1
,
sensitive
detection
limit
207.5
nGy
air
s
spatial
resolution
8.1
lp
mm
unparalleled
stability
under
prolonged
irradiation.
