Optics Express,
Год журнала:
2024,
Номер
32(6), С. 9227 - 9227
Опубликована: Фев. 2, 2024
Ultraviolet
(UV)
photodetector
plays
an
important
role
in
military,
civilian
and
people's
daily
life,
is
indispensable
part
of
spectral
detection.
However,
photodetectors
target
at
the
UVB
region
(280-320
nm)
are
rarely
reported,
devices
detected
by
medium-wave
UV
light
generally
have
problems
such
as
low
detection
rate,
sensitivity,
poor
stability,
which
difficult
to
meet
market
application
needs.
Herein,
Cs-Cu-I
films
with
mixed-phase
been
prepared
vacuum
thermal
evaporation.
By
adjusting
proportion
evaporation
sources
(CsI
CuI),
optical
bandgaps
can
be
tuned
between
3.7
eV
4.1
eV.
This
absorption
cut-off
edge
exactly
both
ends
band,
indicating
its
potential
field
Finally,
based
on
Cs-Cu-I/n-Si
heterojunction
fabricated.
The
shows
good
selectivity
for
has
a
photoresponsivity
22
mA/W,
specific
detectivity
1.83*10
11
Jones,
EQE
over
8.7%
on/off
ratio
above
20
.
Laser & Photonics Review,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 10, 2025
Abstract
Creating
dual‐modal
metal
halide
perovskite
(MHP)‐based
photodetectors
(PDs)
capable
of
working
in
either
broadband
or
narrowband
modes
would
enhance
optical
communication
systems.
However,
challenges
such
as
complex
fabrication,
and
limited
detection
range
(<900
nm)
still
exist.
Herein,
self‐powered,
PDs‐based
on
MHPs
are
demonstrated,
which
integrate
vertical
interfacial
pyro‐phototronic
effect
(IPPE)
lateral
photothermoelectric
(PTEE),
via
doping
these
crystals
with
Ag+
integrating
wide
spectrum
absorber.
The
high‐performance
photodetection
results
from
charge
collection
narrowing
(CCN)‐assisted
IPPE,
enabling
light
specific
wavelength
to
penetrate
into
the
interface,
high
carrier
separation
efficiency
temperature
rise.
In
PD,
metamaterial
absorbers
counter
electrodes
improved
photothermal
conversion
expanded
absorption,
achieving
ultra‐broadband
responses
360
2200
nm.
By
changing
type
MHP
single
(SCs),
response
band
PD
can
be
modulated
purple
red
light,
while
maintaining
capability.
is
fully
used
achieve
double
encryption
during
signal
transmission.
work
offers
a
promising
approach
for
designing
multi‐modal
PDs
wireless
data
security,
applicable
imaging,
biomedical,
intelligent
sensing.
The Journal of Physical Chemistry Letters,
Год журнала:
2025,
Номер
unknown, С. 4449 - 4455
Опубликована: Апрель 25, 2025
To
achieve
comprehensive
environmental
monitoring,
photodetectors
with
broad
operational
wavelength
range
are
crucial
for
capturing
realistic
wide-spectrum
signals
and
supporting
integrated
system
operations.
This
study
presents
a
high-performance
photodetector
based
on
InSrO
nanofiber
(NF)/CsPbBr3
quantum
dot
(QD)
heterojunctions,
achieving
broadband
detection
(230-500
nm)
ultralow
operating
voltage
(0.05
V).
By
synergistically
combining
the
UV
absorption
of
NFs
visible-light
sensitivity
CsPbBr3
QDs,
device
exhibits
responsivity
6.88
A·W-1
detectivity
6.39
×
1014
Jones.
Systematic
analysis
reveals
that
heterointerface
facilitates
efficient
charge
separation,
while
1D
architecture
enhances
directional
carrier
transport.
Notably,
can
retain
95%
initial
photocurrent
after
15
days,
demonstrating
exceptional
stability.
work
advance
development
energy-efficient
optoelectronic
devices
monitoring
optical
communications
applications.
Advanced Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 11, 2025
Abstract
Photodetectors
exhibiting
oppositive
polar
responses
at
two
different
wavelengths
have
been
used
extensively
for
secure
optical
communication.
However,
current
technologies
are
susceptible
to
signal
cancellation
and
cross‐talk,
due
the
time‐independent
of
equal
strengths.
In
this
study,
a
encryption
system
based
on
PMMA‐modified
graphene
(PMG)
photodetector
is
demonstrated
that
shows
remarkable
wavelength‐dependent
temporal
responses:
PMG
detector
largely
constant
response
longer
than
580
nm,
while
linear
time
dependence
shorter
wavelengths.
It
found
qualitatively
attributed
photogating
effects
PMMA‐mediated
oxygen
desorption
process,
respectively.
Moreover,
device
achieves
exceptionally
large
normalized‐gain
values
2.18
×
10
−3
m
2
V
−1
2.97
−5
m
−1
cases,
respectively,
both
surpassing
previously
reported
by
an
order
magnitude
bipolar
responsive
photodetectors
in
ambient
conditions.
By
harnessing
these
distinct
photoresponses
as
encrypted
key
signals
wavelengths,
effective
communication
enhances
recovery
avoids
cancellation.
The
research
introduces
straightforward
yet
efficient
structural
design
with
temporally
specific
represents
significant
advancement
field
Journal of Physics Conference Series,
Год журнала:
2025,
Номер
3008(1), С. 012063 - 012063
Опубликована: Май 1, 2025
Abstract
A
SnO
2
/AlGaN
ultraviolet
heterojunction
phototransistor,
which
achieves
high
gain
and
fast
speed
based
on
longitudinal
lateral
confinement
of
photogenerated
holes,
was
proposed
developed
in
this
work.
The
orthogonal
transport
mechanism
holes
enhanced
the
localization
effect
at
base
meanwhile
reduced
recombination
electrons
there,
thereby
lowered
barrier
promoted
electron
transport,
resulting
response.
fabricated
devices
showed
a
small
dark
current
lower
than
10
pA
below
20
V
bias,
an
ultra-high
2.2×10
5
under
315
nm
illumination,
very
large
photo-to-dark
ratio
1.5×10
8
V,
prompt
impulse
response
with
rise
/fall
time
1.2
μs/91.1
μs.
Laser & Photonics Review,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 26, 2024
Abstract
Self‐powered
photodetectors
(PDs)
have
gained
significant
attention
in
recent
years
due
to
their
ability
operate
without
external
power.
Strengthening
the
built‐in
electric
field
(
E
bi
)
of
these
devices
is
crucial
for
efficient
carrier
separation
and
transport.
However,
disordered
energy
level
arrangement
within
mixed
halide
perovskites
(MHP)
often
conflicts
with
levels
constructed
by
interface,
weakening
thus
affecting
performance
self‐powered
PDs.
In
this
study,
a
bias‐induced
gradient
bandgap
bulk
MHP
proposed
high‐performance
photodetectors.
The
vector
superposition
interface
significantly
boosts
device,
providing
powerful
driving
force
transport
photogenerated
carriers.
obtained
device
exhibits
exceptional
performance,
including
an
ultra‐fast
response
time
1.14/1.75
µs,
large
specific
detectivity
7.27
×
10
12
cm
Hz
1/2
W
−1
,
ultra‐high
responsivity
0.49
A
quantum
efficiency
93.5%
at
0
V
bias.
Furthermore,
strategy
also
demonstrated
lateral
structure
photodetector.
This
work
offers
valuable
guidance
achieving
MHP‐based
PDs
through
optimization.
Optics Express,
Год журнала:
2024,
Номер
32(6), С. 9227 - 9227
Опубликована: Фев. 2, 2024
Ultraviolet
(UV)
photodetector
plays
an
important
role
in
military,
civilian
and
people's
daily
life,
is
indispensable
part
of
spectral
detection.
However,
photodetectors
target
at
the
UVB
region
(280-320
nm)
are
rarely
reported,
devices
detected
by
medium-wave
UV
light
generally
have
problems
such
as
low
detection
rate,
sensitivity,
poor
stability,
which
difficult
to
meet
market
application
needs.
Herein,
Cs-Cu-I
films
with
mixed-phase
been
prepared
vacuum
thermal
evaporation.
By
adjusting
proportion
evaporation
sources
(CsI
CuI),
optical
bandgaps
can
be
tuned
between
3.7
eV
4.1
eV.
This
absorption
cut-off
edge
exactly
both
ends
band,
indicating
its
potential
field
Finally,
based
on
Cs-Cu-I/n-Si
heterojunction
fabricated.
The
shows
good
selectivity
for
has
a
photoresponsivity
22
mA/W,
specific
detectivity
1.83*10
11
Jones,
EQE
over
8.7%
on/off
ratio
above
20
.
