ACS Applied Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 26, 2024
Due
to
their
exceptional
responses
X-ray
exposure,
lead
halide
perovskites
are
recognized
as
ideal
candidates
for
high-spatial-resolution
detectors.
However,
an
effective
method
deposit
a
large-area,
submillimeter-thick,
dense
perovskite
film
detection
has
been
lacking.
In
this
study,
strategy
that
combines
saturated-solution-induced
epitaxial
growth
with
large-area
blade-coating
process
developed
produce
large-size,
submillimeter-thick
CH3NH3PbBr3
films.
The
successive
deposition
of
saturated
precursor
does
not
dissolve
the
underlying
film.
Instead,
it
promotes
crystal
by
controlling
rate
over
nucleation
rate.
obtained
films
exhibit
columnar
grain
structure
fewer
pinholes
and
negligible
residual
lattice
strain.
As
result,
under
source
working
voltage
40
kV,
thick
achieves
sensitivity
up
1938
μC
Gyair–1
cm–2
−3
V
bias,
reduced
dark
current
drift
1.78
×
10–4
nA
s–1
V–1,
limit
47
nGyair
−2
bias;
all
above
among
best
performances
reported
CH3NH3PbBr3-based
Using
point-to-point
scanning
method,
clear
image
could
be
obtained.
This
study
presents
approach
producing
thick,
dense,
crack-free
directly
on
substrates
future
applications.
Self-powered
X-ray
detectors
enable
operating
without
applying
bias,
enabling
detector
portability
and
making
them
highly
valuable
in
the
industrial
medical
fields.
This
study
demonstrates
high-performance
self-powered
using
polar
α-BaTeMo2O9
(α-BTM)
β-BaTeMo2O9
(β-BTM)
oxide
crystals.
It
is
proven
that
carriers
are
driven
by
internal
electrostatic
field
along
axis,
has
a
favorable
effect
on
crystal
detector.
The
β-BTM
sensitivity
of
300.2
µCGyair
-1cm-2
under
40
keV
X-rays,
which
15
times
α-Se
(20
-1cm-2).
structure
simultaneously
addresses
inherent
trade-off
between
dark
current
photocurrent
enhancement
observed
conventional
detectors.
polarization
α-BTM
crystals
leads
to
macroscopic
resulting
fields
34
66
V
mm-1.
Furthermore,
ion
activation
energies
BTM
larger
than
828
meV,
higher
most
perovskite
materials,
excellent
stability
low
current.
breakthrough
performance
stems
from
synergistic
effects
built-in
robust
crystalline
structure,
opening
new
avenues
for
portable
radiation
detection
technologies.
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment,
Год журнала:
2024,
Номер
1067, С. 169735 - 169735
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 10, 2024
Abstract
The
realization
of
large‐area
high‐quality
perovskite
thick
films
under
an
atmospheric
environment
without
humidity
control
is
confronting
urgent
challenge
for
the
applications
in
X‐ray
detection
and
imaging.
A
spray‐coating
method
with
air
as
gas
carrier
employed
to
achieve
flat‐panel
applications.
To
further
improve
quality
films,
10
µm‐thick
CsPbIBr
2
(100)‐preferred
orientation,
low
trap
density
(7.1
×
12
cm
−3
)
high
resistivity
corresponding
dark
current
(3.2
−9
A)
are
prepared
via
dual‐additive‐assisted
(NH
4
SCN
L‐α‐phosphatidylcholine
(LP))
solution
strategy
relative
60%
(60%
RH).
Thus,
metal‐semiconductor‐metal‐structured
(Au/CsPbIBr
/Au)
transverse
device
40
KeV
irradiation
possesses
a
sensitivity
up
1420
µC
Gy
−1
−2
weak
electric
field
18
V
mm
dose
rate
3.3
µGy
s
that
lower
than
≈5.5
required
routine
medical
diagnosis.
Strikingly,
unencapsulated
maintains
80%
(1120
original
after
1000
h
45–55%
RH.
These
results
pave
way
practical
