The Journal of Physical Chemistry Letters,
Journal Year:
2024,
Volume and Issue:
15(26), P. 6835 - 6840
Published: June 25, 2024
Organic–inorganic
hybrid
ternary
copper
halides
offer
a
broader
spectrum
of
structural
possibilities
for
finely
tuning
their
optoelectronic
properties.
Herein,
we
demonstrate
the
first
time
potential
[N(C2H5)4]2[Cu2Br4],
zero-dimensional
halide
[(TEA)2Cu2Br4],
ultraviolet
(UV)
photodetection.
A
self-powered,
visible-blind
UV
photodetector
based
on
(TEA)2Cu2Br4/GaN
heterojunction
architecture
is
developed,
exhibiting
high
responsivity,
detectivity,
and
fast
response
speeds.
The
device
demonstrates
exceptional
stability
against
environmental
oxygen/moisture,
heat,
light
illumination,
surpassing
reported
copper-based
photodetectors.
Our
work
highlights
significant
(TEA)2Cu2Br4
as
lead-free,
stable,
efficient
material
next-generation
photodetection
technology.
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 8, 2025
Two-dimensional
(2D)
organic–inorganic
hybrid
metal
halides
(OIMHs),
characterized
by
noncentrosymmetric
structures
arising
from
the
incorporation
of
chiral
organic
molecules
that
break
inversion
symmetry,
have
attracted
significant
attention.
Particularly,
chiral-polar
2D
OIMHs
offer
a
unique
platform
for
multifunctional
applications,
as
coexistence
chirality
and
polarity
enables
simultaneous
manifestation
distinct
properties
such
nonlinear
optical
(NLO)
effects,
circular
dichroism
(CD),
ferroelectricity.
In
this
study,
we
report
first
synthesis
hafnium
(Hf)-based
OIMHs,
achieved
through
strategic
para-substituents
on
benzene
ring
components.
By
tuning
substituents,
successfully
modulate
crystal
structures,
resulting
in
both
chiral-nonpolar
systems.
Our
analysis
structural
properties,
supported
density
functional
theory
calculations,
demonstrates
these
materials
can
be
systematically
tuned,
enabling
adjustable
band
gaps
CD
UV
range
(200–280
nm).
Notably,
halogen
substitution
at
para-position
layer
produces
tunable
ranging
4.33
to
4.48
eV,
widest
reported
date
OIMHs.
Furthermore,
exhibit
enhanced
NLO
including
remarkable
3.3-fold
increase
second-harmonic
generation
intensity
compounds
compared
their
counterparts.
These
findings
position
Hf-based
promising
candidates
UV-region
devices
self-driven
circularly
polarized
light
detectors,
offering
new
opportunities
designing
optoelectronic
harnessing
interplay
between
polarity.
