Hafnium-Based Chiral 2D Organic–Inorganic Hybrid Metal Halides: Engineering Polarity and Nonlinear Optical Properties via Para-Substituent Effects
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.
Language: Английский
Recent Advances in Emerging Polarization‐Sensitive Materials: From Linear/Circular Polarization Detection to Neuromorphic Device Applications
Rong Lu,
No information about this author
Yanran Li,
No information about this author
Honglin Song
No information about this author
et al.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 19, 2025
Abstract
Polarization
is
an
important
property
of
light
that
provides
some
additional
information
about
the
such
as
polarizability
and
phase.
With
rise
polarized
photodetectors,
detection
may
bring
a
new
way
to
better
understand
information.
Recent
works
have
shown
polarization
detectors
demonstrated
excellent
potential
in
field
neuromorphology,
which
great
significance
for
further
development
artificial
intelligence.
This
review
comprehensively
summarizes
present
research
status
detectors,
including
linearly
(LPPDs)
circularly
(CPPDs).
In
order
assess
current
state
detecting
linearly/circularly
light,
operating
principles
performance
parameters
are
presented.
Next,
universal
semiconductors
used
LPPDs
CPPDs
systematically
classified
summarized.
Based
on
this,
applications
fields
intelligence,
imaging,
digital
signal
processing
then
reviewed.
Finally,
challenging
opportunities
discussed,
followed
by
overview
future
prospects
this
promising
field.
Language: Английский
Technical Routes to Achieve High Circular Polarized Luminescence in Chiral Perovskites: A Mini‐Review
Yongge Yang,
No information about this author
Yang Zhao,
No information about this author
Qing Shen
No information about this author
et al.
Advanced Physics Research,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 7, 2025
Abstract
Chiral
hybrid
organic‐inorganic
perovskites
(HOIPs)
have
emerged
as
promising
materials
for
optoelectronic
and
spintronic
applications,
leveraging
unique
properties
such
circularly
polarized
luminescence
(CPL),
nonlinear
optical
(NLO)
emission,
chiral‐induced
spin
selectivity
(CISS).
However,
challenges
remain
in
stabilizing
these
under
environmental
stresses
precisely
controlling
chirality
scalable
use.
This
review
summarizes
five
main
strategies
to
induce
HOIPs,
i.e.,
direct
incorporation
of
chiral
cations,
surface
modification
with
ligands,
ion
doping,
template‐induced
chirality,
metasurfaces.
Each
approach
offers
distinct
advantages
optimizing
CPL
efficiency
device
stability,
paving
the
way
next‐generation
applications
detectors,
information
encryption,
devices,
etc.
Language: Английский
Stepwise kinetics of the early-stage nucleation in chiral perovskites via ab initio molecular dynamics and free-energy calculations
Nanoscale,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
This
study
examines
the
early-stage
nucleation
of
chiral
perovskites,
uncovering
a
stepwise
kinetic
mechanism
across
timescales
from
picoseconds
to
microseconds.
Language: Английский
Why Mixed Halides in 2D Chiral Perovskites Weaken Chirality-Induced Spin Selectivity
Soirik Dan,
No information about this author
Subham Paramanik,
No information about this author
Amlan J. Pal
No information about this author
et al.
ACS Nano,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 18, 2024
2D
Ruddlesden-Popper
(RP)
perovskites,
upon
inclusion
of
a
chiral
amine,
exhibit
chirality-induced
spin
selectivity
(CISS).
Although
alloying
at
the
halogen
site
in
MBA-based
RPs
(MBA:
methylbenzylammonium)
is
one
suitable
routes
to
tune
CISS
effect,
mixed-halide
RP
perovskites
exhibited
complete
suppression
chirality
when
probed
through
circular
dichroism
(CD).
Here,
we
present
effect
series
perovskites.
We
show
that
photoinduced
halide
segregation
origin
for
apparent
suppression.
The
spin-dependent
charge
transport
was
evidenced
magnetic-conducting
atomic
force
microscopy
(mc-AFM)
studies
and
magnetoresistance
(MR)
measurements.
mc-AFM
results
(
Language: Английский