Small,
Journal Year:
2025,
Volume and Issue:
21(11)
Published: Feb. 14, 2025
Abstract
Obtaining
efficient
perovskite
solar
modules
(PSMs)
with
enhanced
UV
stability
is
essential
for
their
practical
applications,
yet
remains
a
significant
challenge.
In
this
work,
highly
organic–inorganic
copper
halide
downshifting
film
that
significantly
enhances
the
of
PSMs
demonstrated
by
converting
high‐energy
harmful
photons
into
beneficial
visible
light
contribute
to
photovoltaic
performance.
The
tetrapropylammonium
(TPA)
cation
selected
as
main
framework
synthesize
series
halides,
denoted
Br
x
I
y
.
A
near‐unity
photoluminescence
quantum
yield
(PLQY)
99.51%
can
be
achieved
precisely
controlling
Br/I
ratio
2:4,
2
4
,
which
one
highest
values
reported
date.
dual
self‐trapped
excitons
(STEs)
luminescence
mechanism
systematically
investigated
both
temperature‐dependent
and
pressure‐dependent
experiments.
This
dual‐STEs
enables
efficiently
absorb
re‐emit
photons,
thereby
mitigating
photodegradation
induced
light.
Finally,
effective
layer.
an
optimal
efficiency
22.24%,
maintaining
over
90%
initial
after
exposure
total
dose
66.07
kWh
m
−2
Abstract
The
development
of
negative
photoconductivity
(NPC)-related
devices
is
great
significance
for
numerous
applications,
such
as
optoelectronic
detection,
neuromorphic
computing,
and
synapses.
Here,
an
unusual
but
interesting
NPC
phenomenon
in
the
novel
cesium
cobalt
chlorine
(Cs
2
CoCl
4
)
single
crystal-based
reported,
which
simultaneously
possess
volatile
resistive
switching
(RS)
memory
behavior.
Joint
experiment−theory
characterizations
reveal
that
behavior
derived
from
intrinsic
vacancy
defects
Cs
,
could
trap
photogenerated
charge
carriers
produce
internal
electric
field
opposite
to
applied
field.
Such
effect
enables
abnormal
photodetection
performance
with
a
decrease
electrical
conductivity
illumination.
Also,
large
specific
detectivity
2.7
×
10
12
Jones
broadband
detection
wavelength
265
780
nm
were
achieved.
In
addition
response,
resulting
demonstrate
RS
record-low
5
V
m
−1
.
By
integrating
characteristics
electric-pulse
enhancement
light-pulse
depression
NPC,
artificial
synapse
was
successfully
demonstrated,
based
on
simulation
neural
network
algorithm,
recognition
application
handwritten
digital
images
realized.
These
pioneer
findings
are
anticipated
contribute
significantly
practical
advancement
metal
halides
fields
in-memory
technologies
intelligence.
Small,
Journal Year:
2025,
Volume and Issue:
21(11)
Published: Feb. 14, 2025
Abstract
Obtaining
efficient
perovskite
solar
modules
(PSMs)
with
enhanced
UV
stability
is
essential
for
their
practical
applications,
yet
remains
a
significant
challenge.
In
this
work,
highly
organic–inorganic
copper
halide
downshifting
film
that
significantly
enhances
the
of
PSMs
demonstrated
by
converting
high‐energy
harmful
photons
into
beneficial
visible
light
contribute
to
photovoltaic
performance.
The
tetrapropylammonium
(TPA)
cation
selected
as
main
framework
synthesize
series
halides,
denoted
Br
x
I
y
.
A
near‐unity
photoluminescence
quantum
yield
(PLQY)
99.51%
can
be
achieved
precisely
controlling
Br/I
ratio
2:4,
2
4
,
which
one
highest
values
reported
date.
dual
self‐trapped
excitons
(STEs)
luminescence
mechanism
systematically
investigated
both
temperature‐dependent
and
pressure‐dependent
experiments.
This
dual‐STEs
enables
efficiently
absorb
re‐emit
photons,
thereby
mitigating
photodegradation
induced
light.
Finally,
effective
layer.
an
optimal
efficiency
22.24%,
maintaining
over
90%
initial
after
exposure
total
dose
66.07
kWh
m
−2
