Journal of Applied Physics,
Год журнала:
2024,
Номер
136(22)
Опубликована: Дек. 12, 2024
Metal
halide
perovskites
(MHPs)
have
received
considerable
attention
due
to
their
intrinsically
disordered
structures,
leading
abnormally
low
thermal
conductivity,
which
is
beneficial
for
energy
harvesting
applications.
Compared
with
organic–inorganic
hybrid
MHPs,
all
inorganic
MHPs
exhibit
better
stability,
but
conductivity
relatively
high,
about
twice
that
of
MHPs.
In
this
study,
we
investigate
an
all-inorganic
vacancy-ordered
double
perovskite,
Cs2SnI6,
characterized
by
a
cage-like
structure
octahedral
interstitial
radius
approximately
1.638
Å,
allowing
the
accommodation
various
metal
ions.
We
successfully
introduced
Mg2+
ions
as
guest
fillers
into
interstices
Cs2SnI6.
The
weak
ionic
bonds
formed
in
these
oversized
induce
vibrations
enhance
atomic
disorder
and
anharmonicity
within
structure.
As
result,
achieved
exceptionally
κ
=
0.11
W
m−1
K−1
at
room
temperature
Mg0.102Cs2SnI6,
representing
21%
reduction
compared
undoped
sample
marking
one
lowest
values
reported
This
research
offers
novel
approach
effectively
regulate
significantly
reduce
An
ionic
liquid
(B4PBF₄)
was
synthesized
and
characterized
using
spectroscopic
techniques,
incorporating
it
in
different
proportions
(0.25,
0.5,
1.5%
w/w)
into
thin
perovskite
films.
The
results
show
that
1.5
%
concentration
significantly
improves
the
optical
properties
by
minimizing
trap
states
preventing
charge
recombination.
XPS
analysis
indicates
a
strong
interaction
between
lead
halides
at
this
proportion.
Additionally,
photovoltaic
devices
fabricated
with
percentage
achieved
higher
efficiency.
In
terms
of
stability,
also
prevented
water
absorption
on
surface,
delaying
film
degradation
up
to
500
h.
CrystEngComm,
Год журнала:
2024,
Номер
26(38), С. 5421 - 5430
Опубликована: Янв. 1, 2024
Double
perovskites
with
the
general
formula
A
2
B
1
O
6
,
in
which
is
a
lanthanide
or
alkaline
earth
metal
and
are
transition
metals,
famous
for
their
structures
excellent
chemical
physical
properties.
Applied Physics Reviews,
Год журнала:
2024,
Номер
11(4)
Опубликована: Дек. 1, 2024
Recognized
by
the
2019
Nobel
Prize
in
Chemistry,
rechargeable
lithium-ion
battery
(LIB)
has
become
a
world-revolutionary
technology.
Further
developments
of
LIB-based
and
“beyond
LIBs”
regarding
capacity,
cycle
life,
safety
are
intimately
associated
with
fundamental
understanding
chemical
compositions,
structures,
physical
properties
electrodes
electrolytes,
other
related
components.
The
time-evolving
snapshots
dynamical
processes
occurring
during
operation
can
help
design
better
strategies
to
prevent
formation
uncontrolled
interphase
layers,
dendrites,
electrode/electrolyte
decompositions,
generation
gases.
Photoemission
spectroscopy
(PES)
one
important
techniques
for
aforementioned
aspects.
However,
many
potential
pitfalls
cautions
need
be
considered
from
sample
preparation,
PES
measurements,
data
analyses.
Although
primary
focus
this
article
is
not
evaluate
technique
itself,
we
first
introduce
minimal
set
concepts
minimize
misinterpretation
arising
physics
PES.
Subsequently,
examine
studies
that
utilize
determine
compositions
solid-
liquid-state
materials,
energy
level
diagrams
bridge
different
terminologies
between
electrochemistry,
along
theoretical
aspects
evolving
first-principle
calculations
machine
learning.
Toward
end
review,
outline
future
research
directions.
