Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
34(12)
Published: Dec. 8, 2023
Abstract
Halogenation
of
non‐fused
ring
electron
acceptors
(NFREAs)
plays
an
important
role
in
regulating
their
optoelectronic
properties.
However,
the
underlying
mechanisms
and
impact
on
performance
organic
solar
cells
(OSCs)
have
remained
unclear.
Herein,
a
series
halogenated
NFREAs
incorporating
F,
Cl,
Br,
are
prepared
to
study
effect
crystallization
kinetics,
phase
separation,
molecular
packing,
charge
transport.
Among
various
halogenation
strategies,
chlorination
minimizes
Coulomb
attractive
energy
between
donor
acceptor,
thereby
facilitating
exciton
dissociation.
In
situ
UV–vis
absorption
tests
reveal
that
chlorinated
exhibit
longer
time,
effectively
suppressing
excessive
aggregation
enhancing
overall
crystallinity.
Additionally,
diffusion
length,
which
promotes
dissociation
while
mitigating
recombination
devices.
Consequently,
two
NFREAs,
TCN‐Cl,
PCN‐Cl,
yield
impressive
power
conversion
efficiency
(PCE)
14.85%
15.30%,
respectively,
when
blended
with
PM6
J52
donors.
These
values
represent
highest
reported
PCEs
date
for
A‐π‐A’‐π‐A
A‐π‐D‐π‐A
structures.
The
elucidates
crucial
extending
length
time.
effects
significantly
benefit
separation
within
active
layers,
enhance
suppress
achieving
high‐efficiency
OSCs.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(22)
Published: March 25, 2024
The
development
of
high-efficiency
organic
solar
cells
(OSCs)
processed
from
non-halogenated
solvents
is
crucially
important
for
their
scale-up
industry
production.
However,
owing
to
the
difficulty
regulating
molecular
aggregation,
there
a
huge
efficiency
gap
between
and
halogenated
solvent
OSCs.
Herein,
we
fabricate
o-xylene
OSCs
with
approaching
20
%
by
incorporating
trimeric
guest
acceptor
named
Tri-V
into
PM6:L8-BO-X
host
blend.
incorporation
effectively
restricts
excessive
aggregation
L8-BO-X,
regulates
packing
optimizes
phase-separation
morphology,
which
leads
mitigated
trap
density
states,
reduced
energy
loss
suppressed
charge
recombination.
Consequently,
PM6:L8-BO-X:Tri-V-based
device
achieves
an
19.82
%,
representing
highest
solvent-processed
reported
date.
Noticeably,
addition
Tri-V,
ternary
shows
improved
photostability
than
binary
PM6:L8-BO-X-based
device,
maintains
80
initial
after
continuous
illumination
1380
h.
This
work
provides
feasible
approach
fabricating
high-efficiency,
stable,
eco-friendly
OSCs,
sheds
new
light
on
large-scale
industrial
production
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(21)
Published: Feb. 22, 2024
All-polymer
solar
cells
(all-PSCs)
have
been
regarded
as
one
of
the
most
promising
candidates
for
commercial
applications
owing
to
their
outstanding
advantages
such
mechanical
flexibility,
light
weight
and
stable
film
morphology.
However,
compared
large
amount
new-emerging
excellent
polymer
acceptors,
development
high-performance
donor
lags
behind.
Herein,
a
new
D-π-A
type
donor,
namely
QQ1,
was
developed
based
on
dithienoquinoxalineimide
(DTQI)
A
unit,
benzodithiophene
with
thiophene-conjugated
side
chains
(BDTT)
D
alkyl-thiophene
π-bridge,
respectively.
QQ1
not
only
possesses
strong
dipole
moment,
but
also
shows
wide
band
gap
1.80
eV
deep
HOMO
energy
level
-5.47
eV,
even
without
halogen
substituents
that
are
commonly
indispensable
donors.
When
blended
classic
acceptor
PY-IT,
QQ1-based
all-PSC
delivers
an
PCE
18.81
%.
After
introduction
F-BTA3
third
component,
record
19.20
%
obtained,
highest
value
reported
so
far
all-PSCs.
The
impressive
photovoltaic
performance
originates
from
broad
absorption
range,
reduced
loss,
compact
π-π
stacking.
These
results
provide
insight
in
rational
design
novel
nonhalogenated
donors
further
Energy & Environmental Science,
Journal Year:
2024,
Volume and Issue:
17(5), P. 1916 - 1930
Published: Jan. 1, 2024
The
addition
of
cyclane
1,5-diiodocycloctane
(DICO)
provides
critical
roles
in
extending
exciton
diffusion
length
within
active
layer,
consequently
contributing
to
the
improvement
power
conversion.
efficiency
thick
film
organic
solar
cells.
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.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(19)
Published: Jan. 14, 2024
Abstract
As
simple
and
versatile
tools,
additives
have
been
widely
used
to
refine
active
layer
morphology
played
a
crucial
role
in
boosting
the
power
conversion
efficiency
(PCE)
of
organic
solar
cells
(OSCs).
Herein,
three
novel
solvent
named
Th‐FSi,
Th‐ClSi,
Th‐BrSi
with
same
backbone
2,5‐bis(trimethylsilyl)thiophene
are
designed
synthesized
by
substituting
different
halogens
fluorine,
chlorine,
bromine,
respectively.
Notably,
Th‐ClSi
exhibits
more
significant
dipole
moment
engages
non‐covalent
interactions
small‐molecule
acceptor
(SMA)
L8‐BO,
which
slight
adjustments
intermolecular
interaction,
crystallinity,
molecular
packing
PM6:L8‐BO
layer.
Consequently,
OSCs
incorporating
outperform
their
Th‐FSi
counterparts
photo‐capturing,
reduced
energy
loss,
superior
exciton
dissociation,
charge
transfer
properties,
out‐coming
yields
an
enhanced
PCE
18.29%.
Moreover,
integrating
near‐infrared
absorbing
SMA
(BTP‐eC9)
guest
into
matrix,
absorption
spectrum
span
880–930
nm,
resultant
ternary
achieve
commendable
19.17%,
ranking
among
highest
efficiencies
reported
date
is
expanded.
These
findings
underscore
promise
halogenated
thiophene‐based
as
potent
avenue
for
morphological
fine‐tuning
consequent
enhancement
OSCs.
Journal of Materials Chemistry A,
Journal Year:
2024,
Volume and Issue:
12(7), P. 4077 - 4085
Published: Jan. 1, 2024
The
nonfullerene
acceptor
L8-BO
as
solid
additive
was
incorporated
into
QLA-PSCs
based
on
PM6
and
PY-IT.
molecular
orientation
exciton
diffusion
length
in
PY-IT
layer
can
be
optimized,
resulting
the
PCE
enhanced
from
16.14%
to
17.74%.
Advanced Energy Materials,
Journal Year:
2024,
Volume and Issue:
14(22)
Published: March 11, 2024
Abstract
Trap
states
in
organic
solar
cells
(OSCs)
can
capture
free
charges,
leading
to
a
reduction
current
density
and
significant
energy
loss.
Since
charge
collection
is
primarily
dependent
on
the
interface
layer,
minimizing
trap
at
interfaces
effectively
suppress
losses,
topic
that
has
been
rarely
explored.
Herein,
an
strategy
proposed
by
combining
Me‐4PACz
PEDOT:PSS
mitigate
trap‐assisted
nonradiative
recombination
hole
transport
layer
(HTL).
OSCs
based
Me‐4PACz/PEDOT:PSS
exhibit
reduced
densities
low
losses
compared
devices
fabricated
with
single‐layer
HTL.
This
be
attributed
lower
rate
during
interface.
Changes
work
function
of
two
interlayers
due
contact
result
existence
built‐in
potential
inside
composite
interlayer,
promoting
reducing
loss
from
recombination.
Furthermore,
HTL
induces
vertical
phase
separation
active
improvements
fill
factor
for
OSCs.
As
result,
high
power
conversion
efficiencies
(PCEs)
18.70%
19.02%
are
achieved
binary
all‐polymer
polymer
donor/small
molecule
acceptor
cells,
respectively.
Energy & Environmental Science,
Journal Year:
2024,
Volume and Issue:
17(14), P. 5173 - 5182
Published: Jan. 1, 2024
By
introducing
highly
crystalline
material
D18A
into
donor
layer
acting
as
energy
and
nucleating
agent,
an
optimal
PCE
of
19.25%
was
achieved
for
PM1
:
D18A/L8-BO
based
OPVs.
Energy & Environmental Science,
Journal Year:
2024,
Volume and Issue:
17(12), P. 4216 - 4227
Published: Jan. 1, 2024
Pincer-shaped
non-covalent
bond
interactions
are
introduced
between
a
small-molecule
additive
and
polymer
acceptor,
effectively
improving
the
photovoltaic
performance
mechanical
stability
of
all-polymer
solar
cells.
ACS Materials Letters,
Journal Year:
2024,
Volume and Issue:
6(7), P. 2964 - 2973
Published: June 12, 2024
Layer-by-layer
(LbL)
all-polymer
solar
cells
(APSCs)
are
constructed
with
or
without
the
incorporation
of
a
Pt
complex
F-Pt
as
an
energy
donor
additive
in
acceptor
layer.
The
power
conversion
efficiency
(PCE)
LbL
APSCs
can
be
enhanced
from
15.86%
to
17.14%
through
introducing
0.2
wt
%
PY-IT
layer,
originating
efficient
transfer
PM6
and
PY-IT.
well
confirmed
spectral
overlapping
between
photoluminescence
(PL)
spectra
absorption
PY-IT,
prolonged
PL
lifetime
according
transient
time-resolved
blend
films.
universality
strategy
further
PBQx-TCl/PY-DT
based
APSCs,
PCE
increased
17.57%
18.29%
by
incorporating
into
PY-DT
