Two-dimensional
side-chain
plays
a
crucial
role
in
the
construction
of
efficient
non-fused
ring
electron
acceptors
(NFREAs).
Herein,
we
introduce
an
NFREA,
PCT-4Cl,
featuring
tert-butyl
carbazole
side-chain,
and
investigate
its
optoelectronic
properties.
Notably,
PCT-4Cl
exhibits
small
singlet-triplet
energy
gap
(ΔEST)
0.25
eV.
Blending
with
host
eC9
or
C8C8-4Cl
acceptor
extends
lifetime
singlet
excitons
exciton
diffusion
length
blend
films.
Moreover,
high
level
triplet
state
(ET1)
facilitates
transfer
to
C8C8-4Cl.
The
addition
PM6:eC9
also
leads
longer
crystallization
time,
restraining
aggregation
enhancing
crystallinity
ternary
Consequently,
power
conversion
efficiencies
(PCEs)
18.84%
15.17%
are
achieved
based
on
optimized
devices
PM6:eC9:PCT-4Cl
PM6:C8C8-4Cl:PCT-4Cl,
respectively,
surpassing
performance
(17.34%)
PM6:C8C8-4Cl
(14.05%).
Furthermore,
leveraging
2PACz
as
hole
transporting
layer
elevates
PCEs
organic
solar
cells
(OSCs)
19.25%
15.53%.
These
findings
underscore
significant
ET1
NFREA
for
charge
transfer,
well
modulating
crystallinity,
presenting
promising
pathway
achieving
higher-performance
both
binary
OSCs.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
146(17), P. 12011 - 12019
Published: April 19, 2024
Organic
photovoltaics
(OPVs)
suffer
from
a
trade-off
between
efficient
charge
transport
and
suppressed
nonradiative
recombination
due
to
the
aggregation-induced
luminance
quenching
of
organic
semiconductors.
To
resolve
this
grand
challenge,
π-extended
nonfullerene
acceptor
(NFA)
B6Cl
with
large
voids
among
honeycomb
network
is
designed
introduced
into
photovoltaic
systems.
We
find
that
presence
small
amount
(i.e.,
0.5
or
1
wt
%)
can
compress
molecular
packing
host
L8-BO,
leading
shortened
π–π
stacking
distance
3.59
3.50
Å
(that
will
improve
transport)
together
ordered
alkyl
chain
inhibit
energy
loss
C–C
C–H
bonds
vibrations),
as
validated
by
high-energy
X-ray
scattering
measurements.
This
morphology
transformation
ultimately
results
in
simultaneously
improved
JSC,
FF,
VOC
OPVs.
As
result,
maximum
PCEs
PM6:L8-BO
D18:L8-BO
are
increased
19.1
19.3%
19.8
20.2%,
respectively,
which
highest
values
for
single-junction
The
university
increase
performance
OPVs
further
evidenced
range
polymer:NFA
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
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
136(21)
Published: Feb. 22, 2024
Abstract
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
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
64(1)
Published: Aug. 24, 2024
Disordered
polymer
chain
entanglements
within
all-polymer
blends
limit
the
formation
of
optimal
donor-acceptor
phase
separation.
Therefore,
developing
effective
methods
to
regulate
morphology
evolution
is
crucial
for
achieving
morphological
features
in
organic
solar
cells
(APSCs).
In
this
study,
two
isomers,
4,5-difluorobenzo-c-1,2,5-thiadiazole
(SF-1)
and
5,6-difluorobenzo-c-1,2,5-thiadiazole
(SF-2),
were
designed
as
solid
additives
based
on
widely-used
electron-deficient
benzothiadiazole
unit
nonfullerene
acceptors.
The
incorporation
SF-1
or
SF-2
into
PM6
:
PY-DT
blend
induces
stronger
molecular
packing
via
interaction,
leading
continuous
interpenetrated
networks
with
suitable
phase-separation
vertical
distribution.
Furthermore,
after
treatment
SF-2,
exciton
diffusion
lengths
films
are
extended
over
40
nm,
favoring
charge
transport.
asymmetrical
characterized
by
an
enhanced
dipole
moment,
increases
power
conversion
efficiency
(PCE)
PY-DT-based
device
18.83
%
due
electrostatic
interactions.
Moreover,
a
ternary
strategy
boosts
PCE
SF-2-treated
APSC
19
%.
This
work
not
only
demonstrates
one
best
performances
APSCs
but
also
offers
approach
manipulate
using
rational-designed
additives.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 9, 2024
Abstract
The
ternary
strategy
has
proven
effective
in
enhancing
the
performance
of
organic
solar
cells
(OSCs),
yet
identifying
optimal
third
component
remains
a
challenge
due
to
lack
theoretical
frameworks
for
predicting
its
impact
based
on
molecular
structure.
This
study
addresses
this
by
proposing
quantitative
parameters
derived
from
surface
electrostatic
potential
(ESP)
as
criteria
selecting
components.
asymmetric
acceptor
BTP‐OS,
which
exhibits
lower
total
average
ESP
and
larger
polarization
index
relative
host
acceptor,
is
introduced
into
PM6:L8‐BO
system.
incorporation
led
weakened
ESP‐induced
intermolecular
interactions
reduce
miscibility
with
donor
polymer,
resulting
an
optimized
multi‐scale
morphology
blend.
Consequently,
device
achieved
efficiency
19.72%,
one
highest
values
PM6:L8‐BO‐based
devices,
enhanced
exciton
dissociation
charge
collection,
energy
disorder,
minimized
non‐radiative
losses.
Comparable
improvements
are
also
verified
PM6:BTP‐eC9
D18:N3
systems,
demonstrating
broad
applicability
proposed
approach.
not
only
provides
practical
principle
components
but
establishes
broader
framework
optimizing
OSCs,
potentially
advancing
development
more
efficient
OSCs
across
diverse
material
systems.
Journal of Materials Chemistry A,
Journal Year:
2024,
Volume and Issue:
12(27), P. 16251 - 16267
Published: Jan. 1, 2024
We
review
polythiophene
and
its
derivative
(PT)-based
polymer
donors
for
all-PSCs,
focusing
on
material
design,
morphology
optimization
strategies,
the
selection
design
of
acceptors
that
complement
their
properties.
The Journal of Physical Chemistry Letters,
Journal Year:
2024,
Volume and Issue:
15(6), P. 1694 - 1701
Published: Feb. 5, 2024
Perovskite
solar
cells
(PSCs)
have
attracted
significant
attention
due
to
their
high
efficiencies
that
are
closely
associated
with
the
optimized
interface
of
perovskite
(PVK)
films.
However,
during
film
deposition,
tremendous
interfacial
defects
generated
in
PVK
films,
which
suppress
device
performance.
Herein,
we
employ
an
organic
molten
chloride
salt
4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium
(DMTMM)
on
surface
regulate
properties
through
reconstruction
by
heating
110
°C,
DMTMM
undergoes
obvious
phase
transition
from
a
solid
liquid
salt.
The
mobile
coordinates
unsaturated
Pb2+
and
halide
vacancies
heal
structural
defects.
After
mixture
cools
room
temperature,
compact
interlayer
is
formed
protect
PVKs
degradation
air.
Consequently,
DMTMM-treated
MAPbI3-based
PSCs
yield
champion
PCE
approaching
20%
stability.
This
molten-salt-assisted
strategy
provides
new
approach
establish
highly
stable
hybrid
films
for
high-performance
PSCs.
Journal of Materials Chemistry A,
Journal Year:
2024,
Volume and Issue:
12(37), P. 24862 - 24871
Published: Jan. 1, 2024
The
layer-by-layer
(LBL)
strategy
is
an
efficient
way
to
improve
the
power
conversion
efficiency
(PCE)
of
organic
solar
cells
(OSCs)
due
their
superiorities
in
vertical
component
distribution.
