The Journal of Physical Chemistry C,
Journal Year:
2024,
Volume and Issue:
128(45), P. 19319 - 19328
Published: Oct. 31, 2024
We
have
investigated
charge
generation
pathways
in
efficient
organic
photovoltaic
blends
of
the
polymer
donor
D18
and
small-molecule
acceptor
Y6
using
transient
absorption
time-resolved
fluorescence
spectroscopies.
find
that
energy
transfer
from
to
outcompetes
electron
is
followed
by
exciton
diffusion
regions
disordered
phase
aggregates
before
hole
D18.
Aggregation
molecules
increases
their
ionization
∼0.3
eV
provides
a
driving
force
for
excitons
spontaneously
generated
pairs
observed
ultrafast
depolarization
ground-state
bleaching
<200
fs,
which
indicates
delocalization
primary
aggregates.
This
can
explain
spontaneous
neat
films
Y6-rich
blends.
Our
results
show
subtle
aggregation
control
low-energy
absorber
be
used
balancing
photocurrent
with
low
voltage
loss
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(16)
Published: Jan. 2, 2024
Abstract
The
layer‐by‐layer
(LbL)
organic
photovoltaics
(OPVs)
are
constructed
with
wide‐bandgap
donor
PM1
and
narrow‐bandgap
acceptor
L8‐BO.
exciton
utilization
near
cathode
is
still
challenging
considering
restricted
diffusion
distance
of
excitons
inability
for
transferring
energy
from
L8‐BO
to
PM1.
Herein,
incorporation
into
layer
(DIA)
strategy
employed
improve
cathode.
efficiency
LbL
OPVs
can
be
improved
18.02%
18.81%
by
incorporating
10
wt%
layer,
which
closely
associated
efficient
separation
originated
more
adequate
donor/acceptor
interface
faster
charge
transfer,
as
evidenced
magneto‐photocurrent
transient
absorption
results.
in
situ
test
morphological
characterization
clarify
that
molecular
packing
property
benefited
prolonged
aggregation
nucleation
time
assisted
DIA
strategy,
contributing
transport
inhibited
recombination
active
layers.
thickness
insensitive
also
induced
indicated
PCE
retention
value
(82.2%
vs.
74.0%)
PM1/L8‐BO:PM1
PM1/L8‐BO
when
increased
≈180
nm.
This
work
demonstrates
the
effectiveness
improving
tolerance
OPVs.
Understanding
the
thermal
degradation
mechanism
of
organic
solar
cells
(OSCs)
and
developing
strategies
to
enhance
their
stability
are
crucial
before
they
can
be
commercialized.
In
this
paper,
we
demonstrated
that
in
a
structure-inverted
ITO/ZnO/PM6/L8-BO/TCTA/MoO3/Ag
cell,
thin
4,4′,4″-tris(carbazol-9-yl)-triphenylamine
(TCTA)
film
between
MoO3
PM6:L8-BO
significantly
suppress
fast
short
circuit
current
(JSC)
loss
slow
but
continuous
open
voltage
(VOC)
fill
factor
(FF)
decay
upon
150
°C
annealing.
XPS
TOF–SIMS
results
confirm
annealing
leads
formation
(MoO3)−
at
MoO3/PM6/L8-BO
interface
diffusion
through
photoactive
layer.
The
diffused
act
as
acceptor-type
impurities
p-doping
layer,
increasing
charge
recombination
within
layer
reducing
JSC.
addition,
accumulation
cathode
consequently
decreases
VOC
FF.
thermally
induced
interfacial
model
is
supported
by
detailed
drift-diffusion
simulations.
TCTA-interlayer
minimizes
diffusion,
thereby
stabilizing
cell
performance
against
TCTA-incorporating
showed
high
PCE
over
16%
after
high-temperature
hot-press
encapsulation,
resulting
excellent
under
85
°C.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(3), P. 3778 - 3785
Published: Jan. 10, 2024
Although
recent
dramatic
advances
in
power
conversion
efficiencies
(PCEs)
have
resulted
values
over
19%,
the
poor
photostability
of
organic
photovoltaics
(OPVs)
has
been
a
serious
bottleneck
to
their
commercialization.
The
photocatalytic
effect,
which
is
caused
by
incident
ultraviolet-A
(UV-A,
320–400
nm)
light
most
commonly
used
zinc
oxide
(ZnOX)
electron
transport
layer
(ETL),
significantly
deteriorates
OPVs.
In
this
work,
we
develop
new
and
facile
method
enhance
nonfullerene
acceptor-based
OPVs
introducing
UV-A-insensitive
titanium
suboxide
(TiOX)
ETL.
Through
an
in-depth
analysis
mass
information
at
interface
between
ETL
photoactive
layer,
confirm
that
TiOX
suppresses
effect.
resulting
device
employing
shows
excellent
photostability,
obtaining
80%
initial
PCE
for
up
200
h
under
1
sun
illumination,
10
times
longer
than
conventional
ZnOX
system
(19
h).
Small Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 4, 2025
Herein,
the
role
of
molecular
engineering
on
optoelectronic
properties
antimony
corroles
with
two
distinct
β
‐substituents
and
different
oxidation
states
is
studied.
Insertion
a
strong
electron‐withdrawing
SCN
group
bi‐pyrrole
unit
corrole
increases
dipole
moment.
Consequently,
dielectric
constant
enhanced
by
up
to
threefold,
reaching
value
8
for
antimony(V)
tetra(thiocyano)corrole,
significantly
higher
than
any
solution‐processable
organic
semiconductor
reported
date.
Moreover,
this
SCN‐substituted
molecule
also
exhibits
an
increased
charge
carrier
mobility
at
least
orders
magnitude.
A
combination
suitable
metallic
state
substitution
crucial
in
defining
absorption,
mobility,
constant,
all
which
impact
photovoltaic
performance.
The
fluorescence
quantum
yield
champion
300%,
lifetime
extended
twofold,
indicating
fewer
nonradiative
recombination
pathways
or
lower
degree
disorder.
single‐component
photodetectors
white
light
responsivity
as
high
10
W
−1
,
ranking
among
best
donor‐based
semiconductors,
solar
cell
fabricated
from
tetra(thiocyano)corrole
that
open‐circuit
voltage
0.7
V,
three
times
poly(3‐hexylthiophene)
(P3HT)‐based
devices,
are
demonstrated.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 16, 2025
Abstract
Organic
solar
cells
(OSCs)
have
garnered
significant
attention
owing
to
the
light
weight,
flexibility,
and
low
cost.
Continuous
improvement
in
molecular
design,
morphology
control,
device
fabrication
has
propelled
power
conversion
efficiency
of
OSCs
beyond
20%.
While
obtaining
long‐term
stability
is
still
a
critical
obstacle
for
commercialization
OSCs.
The
nano‐
microstructural
characteristics
active
layer
morphology—including
stacking,
phase
separation,
domain
sizes—play
pivotal
role
determining
performance.
Consequently,
comprehensive
understanding
how
film
structure
impacting
methods
control
are
vital
improving
lifetime.
This
review
seeks
elucidate
structure–performance
relationship
between
from
nanoscale
microscale
stability.
It
can
provide
rational
guidance
enhance
accelerating
