Chemistry of Materials,
Год журнала:
2024,
Номер
36(21), С. 10758 - 10772
Опубликована: Окт. 16, 2024
Ethanolammonium
lead
iodide
(EOA2PbI4)
and
propanolammonium
(AP2PbI4)
are
two-dimensional
hybrid
organic–inorganic
perovskites
with
reduced
dielectric
confinement
exciton
binding
energy.
These
compounds
exist
in
three
polymorphic
forms,
two
of
which
metastable,
each
distinct
constants,
nonlinear
optical
(NLO)
properties,
photoluminescence
characteristics.
The
initial
red
phases
I
isostructural,
displaying
monoclinic
P21/c
symmetry
narrow-line
green
PL,
stable
up
to
approximately
369
K
for
EOA2PbI4
319
AP2PbI4.
Beyond
these
temperatures,
they
undergo
a
reconstructive
first-order
phase
transition
high-temperature
II,
characterized
by
unlocked
organic
cation
motion,
as
indicated
Raman
data.
This
results
color
change
orange
(yellow)
due
blue
shift
the
band
gap
excitonic
absorption,
more
pronounced
II
is
prone
supercooling
metastable
regime,
where
it
either
reverts
or
transforms
new
low-temperature
III
ordered
cations
slightly
distorted
inorganic
substructure.
In
III,
single
broad
peak,
large
Stokes
shift,
electron–phonon
coupling,
particularly
AP2PbI4
(>1
eV),
indicating
significant
substructure
deformation.
Phase
lacks
second-harmonic
generation
(SHG)
activity,
while
SHG
response
observed
EOA2PbI4.
metastability
acentric
supercooled
centric
harnessed
introduce
type
NLO
functionality,
namely,
embedded
self-erasing
switching.
"embedded"
scheme
requires
thermodynamically
unstable
crystal
phases,
one
noncentrosymmetric,
necessitates
thermal
activation,
such
annealing
followed
cooling.
unconventional
route
triggering
responses,
along
spontaneous
reversion
centrosymmetric
phase,
enables
switching
between
SHG-on
SHG-off
states.
Chemistry of Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 29, 2025
Ion-mixing
is
a
highly
effective
strategy
for
tuning
the
performance
and
stability
of
photovoltaic
devices
based
on
hybrid
perovskites.
Despite
many
works
concentrating
A-
X-site
mixing
effects,
comprehensive
study
effects
B-site
structural
dynamic
properties
MA-based
perovskites
still
absent.
In
this
work,
we
investigate
mixed
lead–tin
halide
MAPb1–xSnxBr3
using
multitechnique
experimental
approach
including
differential
scanning
calorimetry,
dielectric
spectroscopy,
nuclear
quadrupole
resonance
experiments.
We
map
phase
diagram
system,
which
reveals
that
slightly
stabilizes
cubic
affects
MA
cation
dynamics
ordering,
although
observed
are
less
prominent
compared
with
mixing.
Our
results
provide
insights
into
complex
interplay
in
mixed-metal
contributing
to
their
potential
optimization
applications.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 7, 2025
Enhanced
spin-splitting
driven
by
inversion
asymmetry
can
be
effectively
achieved
through
the
incorporation
of
chiral
organic
cations
in
hybrid
organic-inorganic
systems.
Herein,
we
investigated
mechanisms
and
implications
chirality
transfer
heterostructured
perovskites
belonging
to
(PbBr2)2A2PbBr4
family,
where
A
represents
cation.
These
structures
are
characterized
an
inorganic-organic-inorganic
stacking
configuration
comprising
one
perovskite
monolayer
PbBr2
intergrowth
domain.
Our
findings
indicate
that
all
heterostructures
likely
exhibit
energetic
stability.
Importantly,
presence
introduces
local
asymmetries
facilitate
significant
effects.
Additionally,
a
racemic
mixture
induce
transition
from
two-dimensional
zero-dimensional
character
within
domain
heterostructure.
The
dimensionality
observed
for
isomers
structure
is
attributed
effect
hydrogen
bond
enhanced
lattice
strain,
leading
2D
framework
disrupt
into
isolated
octahedra
allow
breaking
centrosymmetry,
stark
contrast
with
previously
reported
literature.
Consequently,
predict
introduction
create
stable
systems
single
degree
freedom
modulates
both
spin-resolved
properties
dimensionality.
This
discovery
provides
vital
design
principle
simultaneous
tuning
spin
splitting
Crystal Growth & Design,
Год журнала:
2025,
Номер
25(5), С. 1597 - 1604
Опубликована: Фев. 24, 2025
Organic–inorganic
metal
halides
(OIMHs)
have
attracted
great
interest
in
the
design
of
various
functional
materials
due
to
their
advantages
easy
processability,
rich
structural
diversity,
and
assembly
flexibility.
However,
rational
control
stacking
patterns
OIMHs
for
regulation
has
been
a
long-standing
challenge.
Particularly,
little
is
known
about
intrinsic
relationship
between
dimensions
dielectric
response
at
molecular
scale.
Here,
we
investigated
modulation
effect
cationic
halogen
engineering
(N,N-dimethylethanolamine)PbBr3
on
stacking,
as
well
its
impact
thermal,
electrical,
optical
physical
properties.
Halogen
brings
varied
from
one-dimensional
(1D)
hexagonal
perovskite
structure
two-dimensional
(2D)
layered
an
interlocking
1D
chain
structure.
These
attributes
demonstrated
be
closely
related
interactions
crystal
lattice,
leading
variation
sequential
increase
phase
transition
temperature
differences
response,
with
similar
bandgaps
that
are
mainly
determined
by
inorganic
frameworks.
This
study
offers
new
insights
into
performance
optimization
organic–inorganic
hybrids.
Materials Horizons,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
A
pair
of
luminescent
chiral
3D
hybrid
metal-halide
perovskite
piezoelectrics
were
reported
and
the
polycrystalline
film
device
based
on
a
compound
exhibits
favorable
performance
in
energy
harvesting
underwater
ultrasound
detection.
Inorganic Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 30, 2025
Manganese(II)
halides
have
received
a
booming
development
owing
to
their
flexible
structures
and
remarkable
optical
properties,
whereas
those
with
multimode
luminescence
color
changes
under
specific
stimuli
are
rarely
reported.
In
this
study,
we
synthesized
zero-dimensional
(C5H14NO)2MnBr4
single
crystal,
which
experiences
an
order-disorder
phase
transition
from
P21/c
P2/m
at
268
K.
Intriguingly,
the
emission
of
exhibits
"symmetric"
switching
green-yellow-orange-red-orange-yellow-green
within
temperature
range
80-420
For
low-temperature
(LTP)
below
K,
green
red
lights
510
640
nm
derived
d-d
electron
Mn(II)
self-trapped
excitons
(SETs),
respectively.
high-temperature
(HTP)
above
dual
peaks
530
can
be
attributed
simultaneous
existence
trapping
detrapping
processes
STEs.
Taking
advantage
unique
thermochromic
behaviors
(C5H14NO)2MnBr4,
temperature-responsive
anticounterfeiting
labels
encryption
codes
multilevel
design
high
security
been
constructed.
This
work
provides
new
insights
for
preparation
metal
multiple
performances,
facilitating
information
protection
technologies.
