Flexible
perovskite
solar
cells
(F‐PSCs)
are
promising
due
to
their
low
cost
and
versatility.
However,
the
thermal
instability
of
flexible
substrates
often
results
in
internal
defects
residual
stress
during
formation
films.
To
address
this
issue,
cellulose
diacetate
(CDA),
a
green
eco‐friendly
material
derived
from
natural
plant
fibers,
is
used.
CDA
not
only
enhanced
quality
films
but
also
reduced
generation
stress.
Furthermore,
it
effectively
passivates
that
arise
annealing
process.
As
result,
power
conversion
efficiency
24.68%
on
substrate,
which
one
highest
values
F‐PSCs,
achieved.
The
incorporation
lead
more
uniform
distribution
bending,
significantly
improving
long‐term
environmental
stability
devices.
This
sustainable
fiber‐based
approach
provides
new
direction
for
advancement
cells.
Science,
Год журнала:
2024,
Номер
386(6724), С. 898 - 902
Опубликована: Ноя. 21, 2024
Surface
passivation
has
driven
the
rapid
increase
in
power
conversion
efficiency
(PCE)
of
perovskite
solar
cells
(PSCs).
However,
state-of-the-art
surface
techniques
rely
on
ammonium
ligands
that
suffer
deprotonation
under
light
and
thermal
stress.
We
developed
a
library
amidinium
ligands,
interest
for
their
resonance
effect–enhanced
N–H
bonds
may
resist
deprotonation,
to
stability
layers
surfaces.
This
strategy
resulted
>10-fold
reduction
ligand
equilibrium
constant
twofold
maintenance
photoluminescence
quantum
yield
after
aging
at
85°C
illumination
air.
Implementing
this
approach,
we
achieved
certified
quasi–steady-state
PCE
26.3%
inverted
PSCs;
report
retention
≥90%
1100
hours
continuous
1-sun
maximum
point
operation
85°C.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(46)
Опубликована: Июнь 27, 2024
Abstract
The
meticulous
control
of
crystal
facets
in
polycrystalline
perovskite
films
offers
valuable
insights
into
the
photoelectric
properties,
varying
significantly
with
different
orientations.
Exploring
effective
means
to
regulate
these
is
crucial,
and
further
revealing
underlying
mechanisms
needed.
Here,
research
employed
green
solution
bathing
obtain
high‐quality
preferred
crystallographic
orientation.
In
brief,
eco‐friendly
2‐pentanol
used
as
solvent,
functional
molecules
2‐(dimethylaminomethyl)‐4‐(2‐aminoethylthiomethyl)thiazole
(DAT)
are
introduced
solute.
By
introducing
DAT
molecules,
precise
over
nucleation
kinetics
achieved,
resulting
a
preferential
(100)
facet
Conversely,
without
exhibited
distinct
(111)
regulation
on
film
verified
through
theoretical
analyses.
Theoretical
calculations
show
that
S
atom
binds
most
strongly
FAPbI
3
,
promoting
surface
energy
reduction
thermodynamic
enhancement,
favoring
Crystallographic
characterization
proved
effect.
addition,
PL/TRPL
tests
confirm
superior
properties
(100)‐oriented
films.
work
introduces
novel
approach
preparation
process
for
regulating
orientation
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Май 31, 2024
The
planar
triple-layer
hole
transport
layer
(HTL)-free
carbon-based
perovskite
solar
cells
(C-PSCs)
have
outstanding
advantages
of
low
cost
and
high
stability,
but
are
limited
by
efficiency.
formation
a
3D/2D
heterojunction
has
been
widely
proven
to
enhance
device
performance.
However,
the
2D
possesses
multiple
critical
properties
associated
with
3D
perovskite,
including
defect
passivation,
energy
level,
charge
properties,
all
which
can
impact
It
is
challenging
find
powerful
means
achieve
comprehensive
regulation
trade-off
these
key
properties.
Herein,
we
propose
chain-length
engineering
alkylammonium
spacer
cations
this
goal.
results
show
that
formed
short-chain
primarily
acts
passivate
defects.
With
increase
in
cation
chain
length,
achieves
more
matched
level
enhancing
built-in
electric
field
promoting
separation.
further
length
impedes
due
insulativity
organic
cations.
Comprehensively,
tetradecylammonium
optimal
balance
interface
separation,
transport.
HTL-free
C-PSCs
exhibit
new
record
efficiency
20.40
%
(certified
20.1
%).
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Июнь 12, 2024
Abstract
As
the
core
component
of
sandwich‐like
perovskite
solar
cells
(PSCs),
quality
layer
is
a
challenge
for
further
progress
in
PSCs
due
to
unfavorable
defects
and
uncontrollable
crystallization.
Here,
surface
post‐treatment
strategy
employing
ethyl
thioglycolate
(ET)
as
ligand
molecule
developed
property
manipulation
films.
ET
can
lower
energy
facets
induces
secondary
growth
grains,
giving
films
with
higher
crystallinity
defect
density.
Meanwhile,
both
carbonyl
sulfhydryl
bind
Pb
2+
,
thus
forming
bidentate
anchoring
on
passivation.
Besides,
perovskite/ET/C
60
interface
presents
improved
charge
transfer
owing
well‐aligned
levels.
Consequently,
power‐conversion‐efficiency
(PCE)
boosted
22.42%
23.56%
(certified
23.29%)
FA
0.85
Cs
0.15
Pb(I
0.95
Br
0.05
)
3
0.9
MA
PSCs,
respectively,
‐based
PSC
larger
area
(1.03
cm
2
delivers
PCE
20.01%.
Importantly,
demonstrates
effective
management
I
PbI
thereby
preventing
accelerated
degradation
lead
leakage
devices.
Thanks
multiple
effects
ET,
resulting
devices
exhibit
significantly
enhanced
ambient
stability
over
course
800
h,
thermal
1500
h
while
maintaining
80.4%
its
original
efficiency.
Journal of Semiconductors,
Год журнала:
2025,
Номер
46(5), С. 052805 - 052805
Опубликована: Май 1, 2025
Abstract
Interfacial
defects
and
environmental
instability
at
perovskite
surfaces
pose
significant
challenges
for
inverted
solar
cells
(PSCs).
Surface
post-treatment
strategies
have
emerged
as
a
viable
approach
to
improve
film
quality
passivate
defects.
Although
organic
molecules
can
both
grain
boundaries
via
hydrogen
or
covalent
bonding,
their
limited
adsorption
specificity
often
results
in
incomplete
defect
neutralization.
In
this
work,
we
introduce
bilayer
passivation
employing
phenethylammonium
iodide
(PEAI)
n-octylammonium
(OAI)
concurrently
mitigate
non-radiative
recombination
stability.
PEAI
passivates
undercoordinated
Pb
2+
surfaces,
effectively
eliminating
deep-level
traps
suppressing
losses.
Meanwhile,
OAI
forms
hydrophobic
barrier
on
the
surface
through
its
long
alkyl
chains,
inhibiting
moisture
penetration
without
compromising
interfacial
charge
transport.
As
result,
exhibits
significantly
enhanced
optoelectronic
performance
stability,
achieving
champion
power
conversion
efficiency
(PCE)
of
24.48%.
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Янв. 2, 2025
The
instability
of
hybrid
wide-bandgap
(WBG)
perovskite
materials
(with
bandgap
larger
than
1.68
eV)
still
stands
out
as
a
major
constraint
for
the
commercialization
perovskite/silicon
tandem
photovoltaics,
yet
its
correlation
with
facet
properties
WBG
perovskites
has
not
been
revealed.
Herein,
we
combine
experiments
and
theoretical
calculations
to
comprehensively
understand
facet-dependent
perovskites.
We
find
that
(111)
facet,
which
owned
higher
ion-migration
activation
energy
lower
diffusion
constant,
endured
better
(100)
in
multi-component
eV
under
electron
beam
or
light
irradiations,
where
excess
charge
carriers
facilitate
halide
migrations
thereafter
phase
segregations.
By
introducing
trioctylphosphine
oxide
into
perovskite,
strong
oriented
growth
film
was
realized
exhibited
enhanced
operational
stability
against
illumination.
fabricated
one
square
centimeter
area
tandems
n-i-p
p-i-n
configurations
deliver
efficiencies
28.03
%
30.78
(certified
30.26
%),
respectively,
both
exhibiting
excellent
at
maximum
power
point
(MPP)
T95
>
1000
h.
between
Here,
authors
introduce
films
achieve
certified
efficiency
30.26%
solar
cells.
