Nano Letters,
Journal Year:
2023,
Volume and Issue:
23(21), P. 9972 - 9979
Published: Oct. 20, 2023
Metal-free
perovskitoids
(MFPs)
with
N2H5+
as
B-site
component
possess
higher
crystal
density
and
hydrogen
bonding
networks
have
been
recently
expanded
into
X-ray
detection.
However,
research
on
this
material
is
in
its
infancy
lacks
an
understanding
of
the
function
halide
components
physical
properties
device
performance.
Here,
N2H5-based
MFP
single
crystals
(SCs)
different
halides
are
fabricated,
influence
structure,
band
nature,
charge
transport
characteristics,
final
performance
actively
explored.
Based
theory
experiments,
tolerance
factor
octahedral
jointly
determine
composition.
Further,
electronegativities
ionic
radii
also
affect
distortion
energy
bending,
further
influencing
carrier
Finally,
a
sensitivity
1284
μC
Gyair-1
cm-2
low
detection
limits
(LoD)
5.62
μGyair
s-1
were
obtained
by
Br-based
due
to
superior
properties.
Nano-Micro Letters,
Journal Year:
2023,
Volume and Issue:
15(1)
Published: May 20, 2023
Abstract
Metal
halide
perovskites
have
recently
emerged
as
promising
candidates
for
the
next
generation
of
X-ray
detectors
due
to
their
excellent
optoelectronic
properties.
Especially,
two-dimensional
(2D)
afford
many
distinct
properties,
including
remarkable
structural
diversity,
high
energy,
and
balanced
large
exciton
binding
energy.
With
advantages
2D
materials
perovskites,
it
successfully
reduces
decomposition
phase
transition
perovskite
effectively
suppresses
ion
migration.
Meanwhile,
existence
a
hydrophobic
spacer
can
block
water
molecules,
thus
making
obtain
stability.
All
these
attracted
much
attention
in
field
detection.
This
review
introduces
classification
summarizes
synthesis
technology
performance
characteristics
direct
detector,
briefly
discusses
application
scintillators.
Finally,
this
also
emphasizes
key
challenges
faced
by
practical
presents
our
views
on
its
future
development.
Advanced Materials,
Journal Year:
2023,
Volume and Issue:
36(6)
Published: Nov. 28, 2023
Abstract
Nowadays,
weak
interlayer
coupling
and
unclear
mechanism
in
layered
hybrid
silver
bismuth
bromine
(LH‐AgBiBr)
are
the
main
reasons
for
limiting
its
further
enhanced
X‐ray
detection
sensitivity
stability.
Herein,
design
rules
LH‐AgBiBr
influence
on
performance
reported
first
time.
Although
shortening
amine
size
can
enhance
coupling,
is
severely
hampered
by
easier
defect
formation
caused
enlarged
micro
strain.
In
contrast,
an
appropriate
divalent
endows
material
with
improved
released
strain,
which
benefits
crystal
stability
mechanical
hardness.
Another
contribution
to
increase
density
dielectric
constant;
thus,
enhancing
absorption
carrier
transport.
Consequently,
optimized
parallel
device
based
BDA
2
AgBiBr
8
achieves
a
record
of
2638
µC
Gy
air
−1
cm
−2
ultra‐low
limit
7.4
nGy
s
,
outperforming
other
detectors.
Moreover,
unencapsulated
displays
remarkable
anti‐moisture,
anti‐thermal
(>150
°C),
anti‐radiation
(>1000
)
endurance.
Eventually,
high‐resolution
hard
imaging
demonstrated
linear
detector
arrays
under
benign
dose
rate
(1.63
µGy
low
external
bias
(5
V).
Hence,
these
findings
provide
guidelines
future
materials
optimization.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(38)
Published: March 21, 2024
Abstract
Metal
halide
perovskites
have
emerged
as
highly
promising
candidates
for
next‐generation
X‐ray
detectors
due
to
their
facile
and
low‐cost
processability,
high
attenuation
coefficient,
tunable
optoelectrical
properties.
In
this
work,
quasi‐2D
Dion‐Jacobson
(DJ)
are
introduced
in
a
flat
panel
imager
(FPXI)
imaging.
This
study
demonstrates
that
the
diammonium
interlayers
DJ
play
key
role
enhancing
structural
stability,
suppressing
ion
migration,
improving
charge
transport.
As
result,
perovskite‐based
FPXIs
achieve
sensitivity
of
18000
µC
Gy
air
−1
cm
−2
,
low
detection
limit
5.7
nGy
s
representing
performance
comparable
state‐of‐the‐art
3D
perovskite
FPXIs.
Thanks
decrease
signal
crosstalk
effect
FPXIs,
spatial
resolution
0.54
line‐pair‐per‐pixel
is
achieved,
which
higher
than
Remarkably,
high‐quality
imaging
achieved
at
total
dose
20
µGy
only
1/5
typically
used
commercial
equipment.
work
not
provides
valuable
insights
guidance
fabrication
2D
but
also
lays
groundwork
adoption
high‐performance,
stable
imagers
novel
flat‐panel
detectors.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(25)
Published: April 2, 2024
Abstract
Detecting
high‐energy
photons
from
the
deep
ultraviolet
(DUV)
to
X‐rays
is
vital
in
security,
medicine,
industry,
and
science.
Wide
bandgap
(WBG)
semiconductors
exhibit
great
potential
for
detecting
photons.
However,
implementation
of
highly
sensitive
high‐speed
detectors
based
on
WBG
has
been
a
huge
challenge
due
inevitable
level
traps
lack
appropriate
device
structure
engineering.
Here,
fast
pyroelectric
photoconductive
diode
(PPD),
which
couples
interface
effect
with
tailored
polycrystal
Ga‐rich
GaOx
(PGR‐GaOx)
Schottky
photodiode,
first
proposed.
The
PPD
exhibits
ultrahigh
detection
performance
DUV
X‐ray
light.
responsivity
light
sensitivity
are
up
10
4
A
W
−1
5
µ
C
Gy
air
cm
−2
,
respectively.
Especially,
induced
by
polar
symmetry
depletion
region
PGR‐GaOx
can
significantly
improve
response
speed
times.
Furthermore,
demonstrated
imaging
enhancement
systems
low
power
consumption
high
sensitivity.
This
work
fully
excavates
provides
novel
design
strategy
achieve
detectors.
Science,
Journal Year:
2024,
Volume and Issue:
384(6691), P. 60 - 66
Published: April 4, 2024
Recently,
the
emergence
of
all-organic
perovskites
with
three-dimensional
(3D)
structures
has
expanded
potential
applications
perovskite
materials.
However,
synthesis
and
utilization
in
2D
form
remain
largely
unexplored
because
design
principle
not
been
developed.
We
present
successful
a
metal-free
layered
perovskite,
denoted
as
Choi-Loh
van
der
Waals
phase
(CL-v
phase),
chemical
formula
A
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 16, 2025
Metal-free
molecular
perovskites
have
shown
great
potential
for
X-ray
detection
due
to
their
tunable
chemical
structures,
low
toxicity,
and
excellent
photophysical
properties.
However,
limited
absorption
environmental
instability
restrict
practical
application.
In
this
study,
cesium-based
(MDABCO-CsX3,
X
=
Cl,
Br,
I)
are
developed
by
introducing
Cs+
at
the
B-site
enhance
while
retaining
toxicity.
The
effects
of
halide
modulation
on
physical
properties
device
performance
systematically
investigated.
Among
variants,
MDABCO-CsBr3
exhibited
superior
stability,
attributed
optimal
ionic
radius
high
stability
Br-.
This
is
further
enhanced
a
higher
tolerance
factor,
which
promotes
stable
3D
cubic
structure
suppresses
ion
migration
within
crystal.
Consequently,
MDABCO-CsBr3-based
detectors
demonstrated
reduced
migration,
minimal
dark
current
drift,
response
under
exposure,
achieving
sensitivity
4124
µC
Gy-1
cm-2
limit
0.45
µGy
s-1.
Moreover,
devices
exhibit
thermal
operating
effectively
temperatures
up
130
°C.
These
results
highlight
as
promising
candidate
efficient
detection,
expanding
applicability
in
advanced
radiation
technologies.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(44)
Published: Sept. 16, 2024
Abstract
Methylammonium
lead
single
crystal
(MAPbI
3
SC)
possesses
superior
optoelectronic
properties
and
low
manufacturing
cost,
making
it
an
ideal
candidate
for
X‐ray
detection.
However,
the
ionic
migration
of
perovskites
usually
leads
to
instability,
dark
current
drift,
hysteresis
detector,
limiting
their
applications
in
well‐established
technologies.
Here,
a
series
detectors
MAPbI
SCs
are
reported
with
different
degrees
deuteration
(D
x
,
=
0,
0.15,
0.75,
0.99).
By
controlling
content
deuterium
(D)
organic
cations,
sensitivity,
detection
limits,
ion
migration,
resistivity
detector
can
be
controlled,
thereby
improving
its
performance.
Due
stronger
hydrogen
bonds
(N─D···I),
activation
energy
significantly
increases
886
meV.
Consequently,
D
0.99
SC
shows
more
than
five‐fold
enhancement,
achieving
record‐high
mobility–lifetime
(µ
τ
)
product
5.39
×
10
−2
cm
2
V
−1
ultrahigh
sensitivity
2.18
6
µC
Gy
under
120
keV
hard
limit
4.8
nGy
air
s
as
well
long‐term
stability.
The
study
provides
straightforward
strategy
constructing
ultrasensitive
imaging
systems
based
on
perovskite
SCs.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(33)
Published: June 22, 2024
The
329-type
bismuth
(Bi)-based
metal
halide
(MH)
polycrystalline
films
have
potential
to
be
applied
in
the
new
generation
of
X-ray
imaging
technology
owing
high
absorption
coefficients
and
excellent
detection
properties.
However,
mutually
independent
[Bi
Inorganic Chemistry,
Journal Year:
2024,
Volume and Issue:
63(14), P. 6396 - 6407
Published: March 26, 2024
Indium
phosphide
(InP)
quantum
dots
(QDs)
have
become
the
most
recognized
prospect
to
be
less-toxic
surrogates
for
Cd-based
optoelectronic
systems.
Due
particularly
dangling
bonds
(DBs)
and
undesirable
oxides,
photoluminescence
performance
stability
of
InP
QDs
remain
improved.
Previous
investigations
largely
focus
on
eliminating
P–DBs
resultant
surface
oxidation
states;
however,
little
attention
has
been
paid
adverse
effects
In–DBs
QDs.
This
work
demonstrates
a
facile
one-step
peeling
passivation
treatment
method
both
In-
Meanwhile,
may
also
effectively
support
encapsulation
ZnSe
shell.
Finally,
generated
InP/ZnSe
display
narrower
full
width
at
half-maximum
(fwhm)
∼48
nm,
higher
yields
(PLQYs)
∼70%,
superior
stability.
enlarges
chemistry
engineering
consideration
considerably
promotes
development
efficient
stable
devices.