Angewandte Chemie,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 12, 2025
Abstract
The
integration
of
organic
dyes
in
perovskite
solar
cells
(PSCs)
to
utilize
near‐infrared
(NIR)
photons
remains
a
challenge.
In
this
study,
selenium‐incorporated
ortho‐benzodipyrrole‐based
NIR
dye
CB‐2Se
was
developed.
CB‐2Se,
featuring
lower
bandgap
1.35
eV,
blended
with
PCBM
form
bulk‐heterojunction
layer
PSCs
for
electron
extraction
and
transport.
Compared
Y6‐16
acceptor,
the
removal
Tz
unit
suppresses
self‐aggregation,
improving
its
compatibility
PCBM.
A
CB‐2Se:PCBM‐incorporated
PSC
achieved
remarkable
power
conversion
efficiency
(PCE)
25.18%
V
OC
1.164
V,
J
SC
25.71
mA/cm
2
,
Fill
Factor
84.15%,
outperforming
that
PCBM‐only
reference
device
(24.35%)
PCBM:Y6‐16‐based
(24.49%).
PCBM:CB‐2Se
enhanced
long‐term
stability
PSCs,
retaining
88%
initial
after
1000
h
under
ambient
air
thermal
conditions.
photophysical
interactions
between
have
been
comprehensively
investigated
by
using
femtosecond
transient
absorption
spectroscopy.
Ultrafast
exciton
separation
into
free
charges
occurs
within
200
femtoseconds
at
interfaces
CB‐2Se.
For
first
time,
transfer
holes
from
back
detected,
providing
valuable
insights
charge
dynamics
utilizing
dyes.
Angewandte Chemie International Edition,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 6, 2025
The
inverted
cesium/formamidinium
(CsFA)-based
methylammonium-free
perovskite
solar
cells
possess
great
potential
in
simultaneously
realizing
high
power
conversion
efficiency
(PCE)
and
excellent
stability.
However,
the
uncontrollable
crystallization
process
poor
film
quality
hinder
further
enhancement
of
photovoltaic
performance
operational
Herein,
we
propose
a
synergistic
modulation
strategy
defects
at
grain
boundaries
(GBs)
interface
by
using
novel
carbonyl
functionalized
spacer
cation.
L-Alanine
benzyl
ester
hydrochloride
(L-ABEHCl)
containing
ammonium
cation
is
incorporated
into
precursor
solution,
increasing
nucleation
rate
reducing
crystal
growth
because
its
strong
interaction
with
components,
leading
to
increased
size
crystallinity.
No
2D
formed
for
L-ABEHCl
as
additive
whereas
upon
post-treatment.
It
revealed
that
FA+
Cs+
solution
suppress
formation
perovskite.
As
result,
passivates
GBs
form
organic
salts
Due
minimized
carrier
nonradiative
recombination
losses,
devices
achieve
maximum
PCE
25.77
%
(certified
stabilized
25.59
%),
which
one
highest
PCEs
ever
reported
based
on
vacuum
flash
evaporation
method.
unencapsulated
target
device
maintains
90.85
initial
after
2300
h
continuous
point
tracking,
among
most
stabilities
accomplished
devices.
Angewandte Chemie,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 11, 2025
Abstract
Hydrogen
vacancies
(V
H
)
were
considered
major
non‐radiative
recombination
centers
in
hybrid
perovskites.
By
employing
a
multiscale
approach
that
combines
first‐principles
calculations
and
molecular
dynamics
(MDs)
simulations,
our
findings
indicated
the
V
impact
was
overestimated
due
to
previous
metastable
configurations.
The
organic
molecules
with
located
on
either
nitrogen
or
carbon
atom
act
as
ligands
form
energetically
stable
dimers
Pb
2+
cations.
These
lower
energy
by
0.35–0.97
eV
MAPbI
3
0.88–1.01
FAPbI
,
compared
non‐bonding
significantly
boosted
potential
barriers
of
hole
capture,
resulting
dramatic
reduction
carrier
capture
coefficients
over
10
orders
magnitude.
Consequently,
total
(
C
for
dominant
are
order
−17
−31
cm
−3
s
−1
respectively.
uncovering
negligible
recombination,
this
work
shifts
focus
toward
more
significant
defects,
instance,
iodine
interstitial
(with
coefficient
−8
),
thereby
paving
way
optimizing
perovskite
solar
cells
efficiency
meet
Shockley–Queisser
limit.
Angewandte Chemie,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 12, 2025
Abstract
The
integration
of
organic
dyes
in
perovskite
solar
cells
(PSCs)
to
utilize
near‐infrared
(NIR)
photons
remains
a
challenge.
In
this
study,
selenium‐incorporated
ortho‐benzodipyrrole‐based
NIR
dye
CB‐2Se
was
developed.
CB‐2Se,
featuring
lower
bandgap
1.35
eV,
blended
with
PCBM
form
bulk‐heterojunction
layer
PSCs
for
electron
extraction
and
transport.
Compared
Y6‐16
acceptor,
the
removal
Tz
unit
suppresses
self‐aggregation,
improving
its
compatibility
PCBM.
A
CB‐2Se:PCBM‐incorporated
PSC
achieved
remarkable
power
conversion
efficiency
(PCE)
25.18%
V
OC
1.164
V,
J
SC
25.71
mA/cm
2
,
Fill
Factor
84.15%,
outperforming
that
PCBM‐only
reference
device
(24.35%)
PCBM:Y6‐16‐based
(24.49%).
PCBM:CB‐2Se
enhanced
long‐term
stability
PSCs,
retaining
88%
initial
after
1000
h
under
ambient
air
thermal
conditions.
photophysical
interactions
between
have
been
comprehensively
investigated
by
using
femtosecond
transient
absorption
spectroscopy.
Ultrafast
exciton
separation
into
free
charges
occurs
within
200
femtoseconds
at
interfaces
CB‐2Se.
For
first
time,
transfer
holes
from
back
detected,
providing
valuable
insights
charge
dynamics
utilizing
dyes.
