Abstract
Polymer
hole
transport
materials
offer
significant
efficiency
and
stability
advantages
for
p–i–n
perovskite
solar
cells.
However,
the
energetic
disorder
of
amorphous
polymer
not
only
limits
carrier
but
also
impedes
contact
between
perovskite,
hindering
formation
high
crystalline
quality
perovskites.
Herein,
a
novel
low
disordered
material,
PF8ICz,
featuring
an
indeno[3,2‐
b
]carbazole
unit
with
extended
π‐conjugation
is
designed
synthesized.
Analyses
based
on
both
theoretical
calculations
experimental
validation
highlight
PF8ICz
as
material
cells,
including
improved
transport,
enhanced
affinity/passivation,
optimized
energy
levels.
Perovskite
films
formed
atop
exhibit
superior
exciton
dynamics.
PF8ICz‐based
cells
achieve
remarkable
power
(PCE
>
25.4%)
outstanding
(retaining
96.2%
95.0%
their
PCE
under
ISOS‐D‐3
ISOS‐L‐3
protocols
over
1000
h,
respectively).
These
findings
underscore
importance
rational
design
materials,
contributing
to
development
high‐performance,
stable
sustainable
solutions.
ACS Energy Letters,
Год журнала:
2024,
Номер
9(3), С. 1103 - 1114
Опубликована: Фев. 21, 2024
Lower
dimensional
or
2D
halide
perovskites,
with
their
versatile
structural
and
functional
properties,
are
known
to
improve
the
performance
room
temperature
stability
of
perovskite
solar
cells.
One
would
expect
perovskites
be
more
resistant
ion
migration
compared
3D
counterparts
because
presence
bulky
organic
cations.
However,
recent
findings
show
that
indeed
is
prevalent
in
similar
perovskites.
Halide
manifests
itself
segregation
under
photoirradiation
as
well
exchange
between
physically
paired
films
different
ions.
Besides
migration,
cation
spacer
cations
A-site
also
seen
when
2D/3D
subjected
light
thermal
stress.
It
important
recognize
importance
while
incorporating
cells
other
optoelectronic
devices,
it
can
detrimental
for
achieving
streamlined
long-term
stability.
This
Perspective
discusses
reports
on
operational
conditions
(at
elevated
given
built-in
bias)
presents
a
few
mitigating
strategies.
Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 5, 2024
Abstract
Li‐TFSI
doped
spiro‐OMeTAD
is
widely
recognized
as
a
beneficial
hole
transport
layer
(HTL)
in
perovskite
solar
cells
(PSCs),
contributing
to
high
device
efficiencies.
However,
the
uncontrolled
migration
of
lithium
ions
(Li
+
)
during
operation
has
impeded
its
broad
adoption
scalable
and
stable
photovoltaic
modules.
Herein,
an
additive
strategy
proposed
by
employing
ferrocenium
hexafluorophosphate
(FcPF
6
relay
medium
enhance
extraction
capability
via
instant
oxidation
function.
Besides,
novel
Fc–Li
interaction
effectively
restricts
movement
Li
.
Simultaneously,
dissociative
group
cleverly
exploited
regulate
unstable
iodide
species
on
surface,
further
inhibiting
formation
channels
stabilizing
interfaces.
This
modification
leads
power
conversion
efficiencies
(PCEs)
reaching
22.13%
20.27%
36
cm
2
(active
area
18
100
56
modules
(PSMs),
respectively,
with
exceptional
operational
stability
obtained
for
over
1000
h
under
ISOS‐L‐1
procedure.
The
FcPF
‐based
engineering
approach
pivotal
advancing
industrialization
PSCs,
particularly
those
relying
high‐performance
spiro‐OMeTAD‐
based
HTLs.
The Journal of Physical Chemistry Letters,
Год журнала:
2024,
Номер
unknown, С. 12362 - 12369
Опубликована: Дек. 9, 2024
Metal
halide
perovskites
are
promising
optoelectronic
materials
with
excellent
defect
tolerance
in
carrier
recombination,
believed
to
arise
largely
from
their
unique
soft
lattices.
However,
weak
lattice
interactions
also
promote
ion
migration,
leading
serious
stability
issues.
Grain
boundaries
(GBs)
have
been
experimentally
identified
as
the
primary
migration
channels,
but
relevant
mechanism
remains
elusive.
Using
molecular
dynamics
a
machine
learning
force
field,
we
directly
model
at
common
CsPbBr3
GB.
We
demonstrate
that
as-built
GB
model,
containing
6400
atoms,
experiences
structural
reconstruction
over
several
nanoseconds,
and
only
Br
atoms
diffuse
after
that.
A
fraction
of
near
either
migrate
toward
center
or
along
through
different
channels.
Increasing
temperature
not
accelerates
via
Arrhenius
activation
allows
more
migrate.
The
energies
much
lower
than
bulk
due
large-scale
distortions
favorable
non-stoichiometric
local
environments
available
GBs.
Making
composition
stoichiometric
by
doping
annealing
can
suppress
migration.
reported
results
provide
valuable
atomistic
insights
into
properties
metal
perovskites.
Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 19, 2024
Abstract
Reduced‐dimensional
perovskites
(RDPs),
a
large
category
of
metal
halide
perovskites,
have
attracted
considerable
attention
and
shown
high
potential
in
the
fields
solid‐state
displays
lighting.
RDPs
feature
quantum‐well‐based
structure
energy
funneling
effects.
The
multiple
quantum
well
(QW)
endows
with
superior
transfer
luminescence
efficiency.
effect
QW
confinement
directly
depends
on
number
inorganic
octahedral
layers
(QW
thickness,
i.e.,
n
value),
so
distribution
values
determines
optoelectronic
properties
RDPs.
Here,
it
is
focused
thickness
RDPs,
detailing
its
structural
characteristics,
carrier
recombination
dynamics,
properties,
applications
light‐emitting
diodes.
reported
control
strategies
also
summarized
discuss
current
challenges
future
trends
This
review
aims
to
provide
deep
insight
into
hope
advancing
their
further
development
applications.
Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Авг. 20, 2024
Abstract
Scanning
probe
microscopy
(SPM)
has
enabled
significant
new
insights
into
the
nanoscale
and
microscale
properties
of
solar
cell
materials
underlying
working
principles
photovoltaic
optoelectronic
technology.
Various
SPM
modes,
including
atomic
force
microscopy,
Kelvin
conductive
piezoresponse
scanning
near‐field
optical
can
be
used
for
investigation
electrical,
chemical
associated
functional
materials.
A
large
body
work
improved
understanding
device
processing
synthesis
in
close
synergy
with
investigations
recent
years.
This
review
provides
an
overview
measurement
capabilities
attainable
insight
a
focus
on
recently
widely
investigated
halide
perovskite
Optics Letters,
Год журнала:
2025,
Номер
50(3), С. 1029 - 1029
Опубликована: Янв. 7, 2025
Bromide–chloride
mixed
perovskites
have
garnered
significant
attention
as
a
direct
and
efficient
material
for
achieving
pure-blue
emission.
However,
the
complex
problem
of
halide
migration
in
presents
obstacle
to
stable
electroluminescence
(EL)
spectra.
Here,
we
investigate
mechanism
partially
replacing
B-site
Pb
2+
with
non-toxic
Sr
achieve
emission
based
on
first
principles.
The
ion
mobility
activation
energy
is
1.23
eV,
which
an
order
magnitude
greater
than
that
halogens.
Meanwhile,
incorporation
triples
halogen
migration.
Furthermore,
defect
formation
increases
from
4.75
eV
5.62
thereby
reducing
channels.
Transient
absorption
spectroscopy
demonstrates
suppressing
pathway
enhancing
promotes
perovskite
film
exhibit
excellent
spectral
stability
under
laser
pumping.
Our
work
provides
insights
development
highly
eco-friendly
devices.
