Cesium-based
two-dimensional
(2D)
perovskites
with
attractive
phase
and
environmental
stability
have
broad
application
prospects
in
single-junction
tandem
perovskite
solar
cells
(PSCs).
However,
the
severe
nonradiative
recombination
significant
energy
losses
due
to
disordered
orientations
distributions
greatly
hinder
carrier
transport
performance
of
cesium-based
2D
PSCs
severely
limit
their
photovoltaic
performance.
Here,
we
employ
an
asymmetric
chiral
spacer
cation
source,
(
IEEE Electron Device Letters,
Год журнала:
2024,
Номер
45(5), С. 861 - 864
Опубликована: Март 26, 2024
Quasi-2D
perovskites
have
attracted
intensive
attentions
for
applications
in
light-emitting
diodes
(LEDs)
due
to
their
high
exciton
binding
energy
and
good
photostability.
However,
the
wide
phase
distribution
inefficient
transfer
quasi-2D
perovskite
are
impeding
realization
of
efficient
stable
pure
red
PeLEDs.
Herein,
an
alkali
metal
iodide,
potassium
iodide
(KI)
is
employed
in
situ
regulate
growth
kinetics
film
with
three
spacer
cations
butylammonium
(BA
+
),
2-phenylethanamine
(PEA
2-naphthylmethylammonium
(NMA
)
by
diffusing
into
interstitial
sites
octahedral
structures.
The
KI
treatment
can
not
only
facilitate
radiative
recombination
efficiency
controlling
distributions
low-n
high-n
phases
improve
transfer,
but
also
passivate
Pb
dangling
bonds
compensate
iodine
vacancies
(V
I
effectively,
which
leading
formation
smooth
dense
morphology.
Based
on
KI-treatment
film,
color-stable
pure-red
PeLED
a
peak
external
quantum
(EQE)
over
10%
was
achieved.
Journal of Materials Chemistry C,
Год журнала:
2024,
Номер
12(37), С. 15232 - 15238
Опубликована: Янв. 1, 2024
Direct
and
non-destructive
transfer
of
large-area
phase-pure
two-dimensional
perovskite
nanosheets
for
the
construction
van
der
Waals
heterostructures.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 15, 2024
Abstract
It
is
reported
that
the
solvent
environment
exerts
a
significant
influence
on
property
of
perovskite
precursor
solution
and
resultant
film,
which
more
pronounced
in
complex
low‐dimensional
perovskites.
Four
additives
with
varying
basicity
are
introduced
to
instigate
tug‐of‐war
among
bonding
interactions,
thereby
exploring
systematic
effect
growth
quantum
wells
photoelectric
properties
films.
A
governing
principle
diverges
significantly
from
those
previously
documented
for
three‐dimensional
perovskites
elucidated
When
coordination
interactions
predominate
environment,
emergence
two‐dimensional
GA
2
PbI
4
transitional
phase
fostered
facilitate
subsequent
transformation
into
desirable
ACI
phase,
crystallization
kinetics
retarded
improve
film
quality.
Hence,
highest
power
conversion
efficiency
(PCE)
22.73%
obtained
GA(MA)
n
Pb
I
3n+1
(
=
5)
based
solar
cells
p‐i‐n
structure.
The
PCE
achieved
this
work
record
cells.
Angewandte Chemie,
Год журнала:
2024,
Номер
137(1)
Опубликована: Авг. 30, 2024
Abstract
Additive
engineering
plays
a
pivotal
role
in
achieving
high‐quality
light‐absorbing
layers
for
high‐performance
and
stable
perovskite
solar
cells
(PSCs).
Various
functional
groups
within
the
additives
exert
distinct
regulatory
effects
on
layer.
However,
few
additive
molecules
can
synergistically
fulfill
dual
functions
of
regulating
crystallization
passivating
defects.
Here,
we
custom‐synthesized
2‐ureido‐4‐pyrimidone
(UPy)
organic
small
with
diverse
as
to
modulate
defects
films
via
Michael
addition
reaction.
Theoretical
experimental
investigations
demonstrate
that
−OH
UPy
exhibit
significant
fixing
uncoordinated
Pb
2+
ions,
passivation
lead‐iodide
antisite
defects,
alleviating
hysteresis,
reducing
non‐radiative
recombination.
Furthermore,
enhanced
C=O
−NH
2
motifs
interact
A‐site
cation
hydrogen
bonding,
which
relieves
residual
strain
adjusts
crystal
orientation.
This
strategy
effectively
controls
passivates
ultimately
enhancing
quality
films.
Consequently,
open‐circuit
voltage
UPy‐based
p‐i‐n
PSCs
reaches
1.20
V,
fill
factor
surpasses
84
%.
The
champion
device
delivers
power
conversion
efficiency
25.75
Remarkably,
unencapsulated
maintained
96.9
%
94.5
its
initial
following
3,360
hours
dark
storage
1,866
1‐sun
illumination,
respectively.
Cesium-based
two-dimensional
(2D)
perovskites
with
attractive
phase
and
environmental
stability
have
broad
application
prospects
in
single-junction
tandem
perovskite
solar
cells
(PSCs).
However,
the
severe
nonradiative
recombination
significant
energy
losses
due
to
disordered
orientations
distributions
greatly
hinder
carrier
transport
performance
of
cesium-based
2D
PSCs
severely
limit
their
photovoltaic
performance.
Here,
we
employ
an
asymmetric
chiral
spacer
cation
source,
(
