ACS Photonics,
Journal Year:
2024,
Volume and Issue:
12(1), P. 128 - 139
Published: Dec. 27, 2024
The
guanidine
compound
has
recently
been
demonstrated
to
be
effective
in
passivating
interface
defects
and
enhancing
the
performance
stability
of
perovskite
photodetectors
(PPDs).
However,
selection
utilization
these
compounds
are
conducted
without
comprehensive
guidance
due
an
insufficient
understanding
mechanisms
functions
their
functional
groups.
Herein,
we
evaluated
defect
passivation
capabilities
acid
(Gua)
by
analyzing
its
electrostatic
potential
molecular
orbitals
then
applied
it
at
all-inorganic
SnO2
films.
smoother
morphology,
larger
crystal,
improved
optoelectronic
properties
Gua-modified
films
suppressing
Gua.
Moreover,
systematic
experiment
calculation
analyses
have
revealed
that
–C═NH
group,
with
a
higher
electron
cloud
density,
not
only
plays
dominant
role
healing
oxygen
vacancies,
free
hydroxyl
groups,
Sn-related
on
surface
but
also
passivates
Pb2+
X–
interface.
Consequently,
PPDs
achieve
exceptional
detectivity
1.32
×
1013
Jones,
responsivity
0.30
A/W,
minimal
dark
current
1.55
10–9
A/cm2.
This
work
provided
valuable
insights
for
customizing
Lewis
base
molecules
crucial
groups
universal
strategy
estimate
select
organic
photoelectronic
devices.
Nature Communications,
Journal Year:
2025,
Volume and Issue:
16(1)
Published: Jan. 17, 2025
Interfacial
trap-assisted
nonradiative
recombination
hampers
the
development
of
metal
halide
perovskite
solar
cells
(PSCs).
Herein,
we
report
a
rationally
designed
universal
passivator
to
realize
highly
efficient
and
stable
single
junction
tandem
PSCs.
Multiple
defects
are
simultaneously
passivated
by
synergistic
effect
anion
cation.
Moreover,
defect
healing
is
precisely
modulated
carefully
controlling
number
hydrogen
atoms
on
cations
steric
hindrance.
Due
minimized
interfacial
energy
loss,
L-valine
benzyl
ester
p-toluenesulfonate
(VBETS)
modified
inverted
PSCs
deliver
power
conversion
efficiency
(PCE)
26.28%
using
vacuum
flash
processing
technology.
suppressing
carrier
recombination,
large-area
modules
with
an
aperture
area
32.144
cm2
perovskite/Si
coupled
VBETS
passivation
PCE
21.00%
30.98%,
respectively.
This
work
highlights
critical
role
hindrance
in
designing
molecular
modulators
advance
stability
Energy & Environmental Science,
Journal Year:
2024,
Volume and Issue:
17(16), P. 6003 - 6012
Published: Jan. 1, 2024
The
trifluoroacetate
pseudohalide
anion,
with
dual
functionalities,
is
introduced
at
the
buried
interface
to
promote
orderly
growth.
This
results
in
a
power
conversion
efficiency
of
25.60%
and
long-term
stability
under
light
exposure.
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 22, 2025
Abstract
Porous
lead
iodide
(PbI
2
)
film
is
crucial
for
the
complete
reaction
between
PbI
and
ammonium
salts
in
sequential‐deposition
technology
so
as
to
achieve
high
crystallinity
perovskite
film.
Herein,
it
found
that
tensile
stress
tin
(IV)
oxide
(SnO
electron
transport
layer
(ETL)
a
key
factor
influencing
morphology
crystallization
of
films.
Focusing
on
this,
lithium
trifluoromethanesulfonate
(LiOTf)
used
an
interfacial
modifier
SnO
/PbI
interface
decrease
reduce
necessary
critical
Gibbs
free
energy
nuclei
formation.
The
relaxed
facilitates
more
porous
generation
with
larger
particles
higher
roughness,
resulting
superior‐quality
Besides,
this
strategy
effectively
passivates
inherent
traps
smooths
levels,
boosting
charge
extraction
transfer.
As
result,
champion
power
conversion
efficiency
(PCE)
25.33%
(25.10%
stabilized
600
s)
achieved.
Furthermore,
device
demonstrates
exceptional
stability,
retaining
90%
its
initial
PCE
at
maximum
point
tracking
measurement
(under
100
mW
cm
−2
white
light
illumination
≈55
°C
temperature,
N
atmosphere)
after
h.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 10, 2024
Abstract
The
presence
of
various
defects
within
the
electron
transport
layer
(ETL),
perovskite
(PVK)
layer,
and
their
interfaces
significantly
affects
efficiency,
hysteresis,
stability
solar
cells
(PSCs)
in
n–i–p
structure.
Herein,
a
defect
passivation
strategy
employing
potassium
4‐methoxysalicylate
(MSAK)
is
utilized
to
efficiently
modulate
ETL,
PVK,
ETL/PVK
interface.
functional
groups
−COO−
−OH
MSAK
molecules,
along
with
K
+
cations,
effectively
reduce
tin
oxide
(SnO
2
)
improve
properties.
Importantly,
MSAK‐SnO
provides
favorable
substrate
for
growth
highly
crystallization
dense
layers.
molecules
also
passivate
bottom
interface
PVK
by
coordinating
under‐coordinated
Pb
2+
ions.
Furthermore,
cations
can
migrate
into
further
enhancing
improving
photovoltaic
performance
PSC
devices.
PSCs
fabricated
using
based
on
achieve
remarkable
power
conversion
efficiency
(PCE)
25.47%,
alongside
reduced
hysteresis
enhanced
stability.
After
being
stored
under
ambient
conditions
60
days,
device
maintains
nearly
90%
its
initial
PCE,
whereas
PCE
pristine
decreases
69.7%
after
aging.
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 12, 2024
Abstract
Pb‐related
imperfections
(surface
or
halide
vacancy
induced
uncoordinated
Pb
2+
,
Pb‐I
antisite,
and
defects)
of
the
ionic
crystal
perovskite
film
seriously
restrict
photovoltaic
performance
solar
cells
(PSCs).
Here,
an
aniline
derivative
N‐(4‐cyanophenyl)acetamide
(CAL)
is
rationally
designed,
incorporating
bilateral
functional
sites
cyano
acetyl
groups,
acting
as
Lewis
base
molecule
for
managing
in
surface
through
post‐treatment.
Theoretical
calculation
experimental
verification
together
proved
reduced
defect
density,
improved
crystallinity,
inhibited
ion
migration
CAL‐modified
perovskite.
Precisely,
a
side
group
another
can
both
coordinate
with
its
low
electrostatic
potential
energy.
Further,
core
π‐π
conjugate
structure
benzene
ring
ligand
tend
to
form
dimer
improve
mobility
carrier
transportation
collection.
The
strategy
demonstrates
champion
PCE
24.35%
air‐processed
PSCs
over
1200
hours
maximum
power
point
tracking
(MPPT)
stability.
This
study
presents
comprehensive
approach
overcoming
current
limitations
PSCs,
paving
way
their
integration
into
mainstream
technologies.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
37(1)
Published: Nov. 17, 2024
Abstract
Organic
ammonium
salts
are
extensively
utilized
for
passivating
surface
defects
in
perovskite
films
to
mitigate
trap‐assisted
nonradiative
recombination.
However,
the
influence
of
alkyl
chain
length
on
molecular
orientation
and
spatial
steric
hindrance
salt
remains
underexplored,
hindering
advancements
more
effective
passivators.
Here,
a
series
organic
is
reported
with
varying
lengths
passivate
optimize
band
alignment.
It
revealed
that
long
chains
promote
parallel
surface,
thereby
reinforcing
interaction
defects,
whereas
excessive
introduces
hindrance,
weakening
anion‐perovskite
interactions.
Nonylammonium
acetate
(NAAc)
optimal
achieves
ideal
balance
between
chemical
interactions,
resulting
superior
passivation.
Through
NAAc
passivation,
high‐performance
inverted
solar
cells
(PSCs)
modules
achieved,
power
conversion
efficiencies
(PCE)
25.79%
(certified
25.12%)
19.62%,
respectively.
This
marks
record
PCE
PSCs
utilizing
vacuum
flash
technology
ambient
conditions.
Additionally,
NAAc‐passivated
devices
retain
91%
their
initial
after
1200
h
continuous
maximum
point
operation.
work
offers
new
insights
into
interplay
advancing
design
PSCs.
Small,
Journal Year:
2024,
Volume and Issue:
20(32)
Published: March 19, 2024
Abstract
High
quality
tin–lead
perovskite
solar
cells
(Sn─Pb
PSCs)
can
be
fabricated
via
simple
solution
processing
methods.
However,
the
instability
of
precursor
solutions
and
their
narrow
usage
windows
still
pose
challenges
in
manufacturing
efficient
reproducible
Sn─Pb
PSCs,
hindering
commercialization
PSCs.
Fluorine
tin
(SnF
2
)
is
widely
used
as
an
antioxidant
to
improve
crystallinity
perovskite.
In
this
study,
another
role
SnF
a
stabilizer
found
restrain
deprotonation
methylammonium
iodide
(MAI)
solution,
which
improves
stability
expands
windows.
Due
inhibition
on
oxidation
deprotonation,
stable
large‐sized
colloidal
clusters
form
gradually
during
aging,
leading
uniform
nucleation/crystallization
film
growth,
significantly
reducing
roughness
defect
density
films.
Because
competitive
process
Sn
2+
,
benefit
larger
cluster
maximizes
after
about
ten
days
storage
solution.
The
champion
efficiency
PSCs
prepared
with
10
aged
22.00%.
performance
devices
stored
for
even
≈40
discloses
wide
additive.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 12, 2024
Host-guest
complexation
offers
a
promising
approach
for
mitigating
surface
defects
in
perovskite
solar
cells
(PSCs).
Crown
ethers
are
the
most
widely
used
macrocyclic
hosts
complexing
surfaces,
yet
their
supramolecular
interactions
and
functional
implications
require
further
understanding.
Here
we
show
that
dipole
moment
of
crown
serves
as
an
indicator
with
both
perovskites
precursor
salts.
A
larger
moment,
achieved
through
substitution
heteroatoms,
correlates
enhanced
coordination
lead
cations.
Perovskite
films
incorporating
aza-crown
additives
exhibited
improved
morphology,
reduced
defect
densities,
better
energy-level
alignment
compared
to
those
using
native
ethers.
We
report
power-conversion
efficiencies
(PCEs)
exceeding
25
%
PSCs,
which
long-term
stability,
record
PCE
21.5
host-guest
complexation-based
modules
active
area
14.0
cm
