Transport Resistance Dominates the Fill Factor Losses in Record Organic Solar Cells
Advanced Energy Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 5, 2025
Abstract
Organic
photovoltaics
(OPV)
are
a
promising
solar
cell
technology
well‐suited
to
mass
production
using
roll‐to‐roll
processes.
The
efficiency
of
lab‐scale
cells
has
exceeded
20%
and
considerable
attention
is
currently
being
given
understanding
minimizing
the
remaining
loss
mechanisms
preventing
higher
efficiencies.
While
recent
improvements
partly
owed
reducing
non‐radiative
recombination
losses
at
open
circuit,
low
fill
factor
(
FF
)
due
significant
transport
resistance
becoming
Achilles
heel
OPV.
term
refers
voltage
light
intensity‐dependent
charge
collection
in
low‐mobility
materials.
In
this
perspective,
it
demonstrated
that
even
highest
organic
(OSCs)
reported
to‐date
have
performance
can
be
attributed
lead
high
losses.
A
closer
look
material
properties
influencing
provided.
How
experimentally
characterize
quantify
described
by
providing
easy
follow
instructions.
Furthermore,
causes
theory
behind
detailed.
particular,
relevant
figures
merit
(FoMs)
different
viewpoints
on
integrated.
Finally,
we
outline
strategies
followed
minimize
these
future
cells.
Language: Английский
MOF Nanosheet Enable Accelerated Redox Kinetics and Ultralow Overpotential for Light‐Assisted Li‐CO2 Battery
Xiaojing Lin,
No information about this author
Ziyuan Wu,
No information about this author
Cong Xu
No information about this author
et al.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 31, 2025
Lithium-carbon
dioxide
(Li-CO₂)
batteries
have
attracted
much
attention
due
to
their
high
energy
density,
low
cost,
and
carbon
sequestration.
However,
the
sluggish
conversion
kinetics
between
CO₂
discharge
product
lithium
carbonate
(Li₂CO₃)
hindered
practical
applications.
Herein,
a
flower-like
photosensitive
metal-organic
framework
(FJU-115-NS)
has
been
employed
as
cathodic
electrocatalyst
for
Li-CO₂
batteries.
The
FJU-115-NS
with
well-ordered
micropores
abundant
exposed
catalytic
sites
can
effectively
facilitate
ion
transport
catalyze
Li₂CO₃
formation/decomposition,
leading
improved
battery
performance.
At
current
density
of
200
mA
g⁻¹,
exhibits
substantial
capacity
31579.34
h
overpotential
1.31
V,
stable
operation
over
3200
h.
Importantly,
under
light
irradiation,
charging
voltage
significantly
dropped
from
4.45
V
(without
light)
3.43
at
2
A
g⁻¹.
Additionally,
cell
demonstrated
an
exceptionally
just
0.45
highlighting
its
enhanced
efficiency
light-assisted
conditions.
This
work
provides
valuable
guidance
developing
MOF
catalysts
upgrade
longevity
Language: Английский
In-situ volatilization of solid additive assists as-cast organic solar cells with over 20 % efficiency
Materials Science and Engineering R Reports,
Journal Year:
2025,
Volume and Issue:
165, P. 101022 - 101022
Published: May 27, 2025
Language: Английский
Fluorine/bromine/selenium multi-heteroatoms substituted dual-asymmetric electron acceptors for o-xylene processed organic solar cells with 19.12% efficiency
Yibo Zhou,
No information about this author
Guangyu Qi,
No information about this author
Han Liu
No information about this author
et al.
Science China Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 15, 2024
Abstract
The
development
of
high-performance
near-infrared
(NIR)
absorbing
electron
acceptors
is
a
major
challenge
in
achieving
high
short-circuit
current
density
(
J
SC
)
to
increase
power
conversion
efficiency
(PCE)
organic
solar
cells
(OSCs).
Herein,
three
new
multi-heteroatomized
Y-series
(bi-asy-Y-Br,
bi-asy-Y-FBr,
and
bi-asy-Y-FBrF)
were
developed
by
combining
dual-asymmetric
selenium-fused
core
brominated
end-groups
with
different
numbers
fluorine
substitutions.
With
gradually
increasing
fluorination,
exhibit
red-shift
absorption.
Among
them,
bi-asy-Y-FBrF
presents
planar
molecular
geometry,
the
maximum
average
electrostatic
potential,
minimum
dipole
moment,
which
are
conducive
intramolecular
packing
charge
transport.
Moreover,
D18:bi-asy-Y-FBrF
active
layer
higher
crystallinity,
more
suitable
phase
separation,
reduced
recombination
compared
D18:bi-asy-Y-Br
D18:bi-asy-Y-FBr
blends.
Consequently,
among
theses
binary
OSCs,
device
achieves
PCE
15.74%
an
enhanced
26.28
mA
cm
−2
,
while
obtains
moderate
15.04%
highest
open-circuit
voltage
V
OC
0.926
V.
Inspired
its
complementary
absorption
NIR-absorbing
BTP-eC9
as
acceptor,
bi-asy-Y-Br
introduced
into
D18:BTP-eC9
construct
ternary
further
boosted
19.12%,
top
values
for
reported
green
solvent
processed
OSCs.
Language: Английский