Abstract
The
use
of
deuterium
are
critical
for
promoting
the
fundamental
understanding
aggregate
materials
and
their
new
functions.
Particularly,
solution
structure
conjugated
polymers
can
be
hardly
resolved
without
deuteration.
However,
studies
about
isotopic
effects
casting
solvents
on
aggregated
structures
photovoltaic
bulk‐heterojunction
blends
deficient.
Here,
impact
deuterated
thermal
behavior,
structures,
device
performance
is
clearly
delineated
first
time
by
multiple
techniques.
enhanced
π‐π
stacking
order
highly
relevant
to
relatively
poor
miscibility
with
solvents.
Benefiting
from
higher
crystallinity
optimized
morphology
processed
films,
devices
able
achieve
better
efficiency
notable
improvement
in
stability.
Our
results
highlight
polymer
systems
reveal
potential
innovative
approaches
fabricate
thermally
stable
high‐efficiency
solar
cells.
Advanced Materials,
Год журнала:
2023,
Номер
35(16)
Опубликована: Янв. 30, 2023
Efficient
photon
utilization
is
key
to
achieving
high-performance
organic
photovoltaic
(OPV)
cells.
In
this
study,
a
multiscale
fibril
network
morphology
in
PBQx-TCl:PBDB-TF:eC9-2Cl-based
system
constructed
by
regulating
donor
and
acceptor
phase-transition
kinetics.
The
distinctive
process
crystal
size
are
systematically
investigated.
PBQx-TCl
eC9-2Cl
form
structures
with
diameters
of
≈25
nm
ternary
films.
Additionally,
fine
fibrils
assembled
PBDB-TF
uniformly
distributed
over
the
networks
eC9-2Cl.
ideal
enables
achieve
superior
charge
transfer
transport
processes
compared
binary
systems;
these
improvements
promote
enhanced
efficiency.
Finally,
high
power
conversion
efficiency
19.51%
single-junction
OPV
cell
achieved.
external
quantum
optimized
exceeds
85%
wide
range
500-800
nm.
A
tandem
also
fabricated
increase
solar
absorption.
has
an
excellent
PCE
more
than
20%.
This
study
provides
guidance
for
constructing
improving
Nature Communications,
Год журнала:
2023,
Номер
14(1)
Опубликована: Авг. 5, 2023
Abstract
Given
that
bromine
possesses
similar
properties
but
extra
merits
of
easily
synthesizing
and
polarizing
comparing
to
homomorphic
fluorine
chlorine,
it
is
quite
surprising
very
rare
high-performance
brominated
small
molecule
acceptors
have
been
reported.
This
may
be
caused
by
undesirable
film
morphologies
stemming
from
relatively
larger
steric
hindrance
excessive
crystallinity
bromides.
To
maximize
the
advantages
bromides
while
circumventing
weaknesses,
three
(CH20,
CH21
CH22)
are
constructed
with
stepwise
brominating
on
central
units
rather
than
conventional
end
groups,
thus
enhancing
intermolecular
packing,
dielectric
constant
them
without
damaging
favorable
packing
through
groups.
Consequently,
PM6:CH22-based
binary
organic
solar
cells
render
highest
efficiency
19.06%
for
acceptors,
more
excitingly,
a
record-breaking
15.70%
when
further
thickening
active
layers
~500
nm.
By
exhibiting
such
acceptor,
our
work
highlights
great
potential
achieving
delicately
brominating.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(30)
Опубликована: Май 26, 2023
Abstract
The
central
core
in
A‐DA
1
D‐A‐type
small‐molecule
acceptor
(SMAs)
plays
an
important
role
determining
the
efficiency
of
organic
solar
cells
(OSCs),
while
principles
governing
efficient
design
SMAs
remain
elusive.
Herein,
we
developed
a
series
with
pyrido[2,3‐
b
]quinoxaline
(PyQx)
as
new
electron‐deficient
unit
by
combining
cascade‐chlorination
strategy,
namely
Py1,
Py2,
Py3,
Py4
and
Py5.
introduction
chlorine
atoms
reduces
intramolecular
charge
transfer
effects
but
elevates
LUMO
values.
Density
functional
theory
(DFT)
reveals
that
Py2
ortho
substituted
PyQx
Py5
two
yield
larger
dipole
moments
smaller
π⋅⋅⋅π
stacking
distances,
compared
other
three
acceptors.
Moreover,
shows
strongest
light
absorption
capability
induced
extended
orbit
overlap
lengths
more
packing
structures
dimers.
These
features
endow
best
device
performance
due
to
better
molecular
aggregation
behaviors,
suitable
domain
sizes
exciton
dissociation
recombination.
This
study
highlights
significance
incorporating
large
moments,
small
distances
dimers
into
development
high‐performance
SMAs,
providing
insight
for
OSCs.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(46)
Опубликована: Июль 12, 2023
Abstract
Organic
solar
cells
(OSCs)
have
attracted
wide
research
attention
in
the
past
decades.
Very
recently,
oligomerized
fused‐ring
electron
acceptors
(OFREAs)
emerged
as
a
promising
alternative
to
small‐molecular/polymeric
acceptor‐based
OSCs
due
their
unique
advantages
such
well‐defined
structures,
batch
reproducibility,
good
film
formation,
low
diffusion
coefficient,
and
excellent
stability.
So
far,
rapid
advances
been
made
development
of
OFREAs
consisting
directly/rigidly/flexibly
linked
oligomers
fused
ones.
In
this
Minireview,
we
systematically
summarized
recent
progress
OFREAs,
including
structural
diversity,
synthesis
approach,
molecular
conformation
packing,
long‐term
Finally,
conclude
with
future
perspectives
on
challenges
be
addressed
potential
directions.
We
believe
that
Minireview
will
encourage
novel
for
OSC
applications.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(10)
Опубликована: Янв. 2, 2023
Side-chain
tailoring
is
a
promising
method
to
optimize
the
performance
of
organic
solar
cells
(OSCs).
However,
asymmetric
alkyl
chain-based
small
molecular
acceptors
(SMAs)
are
still
difficult
afford.
Herein,
we
adopted
novel
n-nonyl/undecyl
substitution
strategy
and
synthesized
two
A-D1
A'D2
-A
double
isomeric
SMAs
with
selenophene-based
central
core
for
OSCs.
Crystallographic
analysis
indicates
that
AYT9Se11-Cl
forms
more
compact
order
intermolecular
packing
compared
AYT11Se9-Cl,
which
contributed
higher
electron
mobility
in
neat
film.
Moreover,
PM6
:
blend
film
shows
better
morphology
appropriate
phase
separation
distinct
face-on
orientation
than
AYT11Se9-Cl.
The
OSCs
obtain
superior
PCE
18.12
%
AYT11Se9-Cl
(17.52
%),
best
efficiency
selenium-incorporated
binary
BHJ
Our
findings
elucidate
chains
precisely
modulates
crystal
enhances
photovoltaic
selenophene-incorporated
SMAs.
Nature Communications,
Год журнала:
2023,
Номер
14(1)
Опубликована: Авг. 21, 2023
The
nonradiative
energy
loss
(∆Enr)
is
a
critical
factor
to
limit
the
efficiency
of
organic
solar
cells.
Generally,
strong
electron-phonon
coupling
induced
by
molecular
motion
generates
fast
decay
and
causes
high
∆Enr.
How
restrict
achieve
low
∆Enr
sticking
point.
Herein,
free
volume
ratio
(FVR)
proposed
as
an
indicator
evaluate
motion,
providing
new
design
rationale
suppress
decay.
Theoretical
experimental
results
indicate
proper
proliferation
alkyl
side-chain
can
decrease
FVR
leading
reduced
while
maintaining
ideal
nanomorphology.
favorable
morphology
are
simultaneously
obtained
in
AQx-6
with
pinpoint
chain
proliferation,
achieving
PCE
18.6%
optimized
VOC,
JSC
FF.
Our
study
discovered
aggregation-state
regulation
great
importance
reduction
coupling,
which
paves
way
high-efficiency
OSCs.
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(14)
Опубликована: Янв. 22, 2023
Abstract
With
the
emergence
of
ADA'DA‐type
(Y‐series)
non‐fullerene
acceptors
(NFAs),
power
conversion
efficiencies
(PCEs)
organic
photovoltaic
devices
have
been
constantly
refreshed
and
gradually
reached
20%
in
recent
years
(19%
for
single
junction
tandem
device).
The
possess
specific
design
concept,
which
greatly
enrich
NFA
types
excellent
compatibility
with
many
donor
materials.
It
is
gratifying
to
note
that
previously
underperforming
materials
combine
these
regulated
shine
again.
Nowadays,
concept
modular
widely
used
research
donors,
injecting
new
vitality
into
field
photovoltaics.
Furthermore,
also
promote
multicomponent
devices,
bilayer
processing
solvent
engineering,
additive
engineering.
Herein,
latest
progresses
polymer
solar
cells
efficiency
over
17%
are
briefly
reviewed
from
aspects
active
material
design,
interface
development,
device
technology.
At
last,
opportunities
challenges
commercialization
future
discussed.
Abstract
Hybrid
cycloalkyl‐alkyl
side
chains
are
considered
a
unique
composite
side‐chain
system
for
the
construction
of
novel
organic
semiconductor
materials.
However,
there
is
lack
fundamental
understanding
variations
in
single‐crystal
structures
as
well
optoelectronic
and
energetic
properties
generated
by
introduction
hybrid
electron
acceptors.
Herein,
symmetric/asymmetric
acceptors
(Y‐C10ch
A‐C10ch)
bearing
bilateral
unilateral
10‐cyclohexyldecyl
designed,
synthesized,
compared
with
symmetric
acceptor
2,2′‐((2Z,2′Z)‐((12,13‐bis(2‐butyloctyl)‐3,9
bis(ethylhexyl)‐12,13‐dihydro‐[1,2,5]thiadiazolo[3,4‐e]thieno[2″,3″′:4′,5′]thieno[2′,3′:4,5]
pyrrolo[3,2‐g]thieno[2′,3′:4,5]thieno[3,2‐b]indole‐2,10‐
diyl)bis(methanylylidene))bis(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile
(L8‐BO).
The
stepwise
decreases
optical
bandgap,
deepens
energy
level,
enables
molecules
to
pack
closely
regular
manner.
Crystallographic
analysis
demonstrates
that
chain
endows
more
planar
skeleton
enforces
compact
3D
network
packing,
resulting
an
active
layer
higher
domain
purity.
Moreover,
affects
donor/acceptor
interfacial
energetics
accelerates
exciton
dissociation,
enabling
power
conversion
efficiency
(PCE)
>18%
2,2′‐((2Z,2′Z)‐((12,13‐bis(2‐ethylhexyl)‐3,9‐diundecyl12,13‐dihydro‐[1,2,5]thiadiazolo[3,4‐e]thieno[2″,3″′:4′,5′]thieno[2′,3′:4,5]pyrrolo[3,2‐g]thieno[2′,3′:4,5]thieno[3,2‐b]indole‐2,10‐diyl)bis(methanylylidene))bis(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile
(Y6)
(PM6):A‐C10ch‐based
solar
cells
(OSCs).
Importantly,
incorporation
Y‐C10ch
third
component
PM6:L8‐BO
blend
results
PCE
19.1%.
superior
molecular
packing
behavior
highlighted
here
fabrication
high‐performance
OSCs.
Advanced Materials,
Год журнала:
2023,
Номер
36(3)
Опубликована: Окт. 13, 2023
The
sequential
deposition
process
has
demonstrated
the
great
possibility
to
achieve
a
photolayer
architecture
with
an
ideal
gradient
phase
separation
morphology,
which
vital
influence
on
physical
processes
that
determine
performance
of
organic
solar
cells
(OSCs).
However,
controllable
preparation
pseudo-planar
heterojunction
(P-PHJ)
distribution
not
been
effectively
elucidated.
Herein,
binary-dilution
strategy
is
proposed,
PM6
solution
micro
acceptor
BO-4Cl
and
L8-BO
donor
respectively,
form
P-PHJ
film.
This
exists
good
(D)
(A)
vertical
larger
D/A
interpenetrating
regions,
promotes
exciton
generation
dissociation,
shortens
charge
transport
distance
optimizes
carrier
dynamics.
Moreover,
dilution
by
regulation
active
layer
aggregation
size
purity,
thus
alleviating
energy
disorder
voltage
loss.
As
result,
device
exhibits
outstanding
power
conversion
efficiency
19.32%
excellent
short-circuit
current
density
26.92
mA
cm