Facile
synthesis
without
involvement
of
toxic
reagents
is
great
significance
in
the
practical
application
photovoltaic
materials.
In
this
work,
four
acceptor-donor-acceptor
(A-D-A)
type
unfused-ring
acceptors
(UFRAs)
with
stepwise
extension
π-conjugation,
i.
e.,
CPFB-IC-n
(n=1-4),
involving
cyclopentadithiophene
(CPDT)
and
1,4-difluorobenzene
(DFB)
as
cores,
are
facilely
synthesized
by
an
atom-,
step-economic
labor-saving
method
through
direct
arylation
C-H
bond
(DACH).
Among
them,
CPFB-IC-4
has
longest
conjugation
lengths
among
molecular
UFRA
ever
reported.
The
dependence
optoelectronic
properties
performances
(n=1-4)
on
length
were
systematically
investigated.
CPFB-IC-2
near
zero
highest
occupied
orbital
(HOMO)
offsets
(ΔEHOMO
=0.06
eV)
achieves
power
conversion
efficiency
(PCE),
due
to
significantly
enhanced
open
voltage
(VOC
)
short
current
(JSC
caused
balanced
frontier
orbitals
(FMOs)
complementary
light
absorption.
Our
work
demonstrates
that
optical
FMOs
UFRAs
can
be
finely
tuned
elongation
lengths.
Meanwhile,
DACH
coupling
a
powerful
tool
here
established
will
promising
candidate
for
synthesizing
high-performance
oligomeric
UFRAs.
Angewandte Chemie International Edition,
Год журнала:
2021,
Номер
60(23), С. 12964 - 12970
Опубликована: Апрель 2, 2021
Abstract
Despite
the
remarkable
progress
achieved
in
recent
years,
organic
photovoltaics
(OPVs)
still
need
work
to
approach
delicate
balance
between
efficiency,
stability,
and
cost.
Herein,
two
fully
non‐fused
electron
acceptors,
PTB4F
PTB4Cl,
are
developed
via
a
two‐step
synthesis
from
single
aromatic
units.
The
introduction
of
two‐dimensional
chain
halogenated
terminals
for
these
acceptors
plays
synergistic
role
optimizing
their
solid
stacking
orientation,
thus
promoting
an
elongated
exciton
lifetime
fast
charge‐transfer
rate
bulk
heterojunction
blends.
As
result,
upon
blending
with
PBDB‐TF
polymer,
has
enabled
single‐junction
OPVs
power
conversion
efficiencies
12.76
%,
representing
highest
values
among
reported
unfused
so
far.
Advanced Materials,
Год журнала:
2021,
Номер
34(10)
Опубликована: Окт. 28, 2021
Abstract
Near‐infrared
(NIR)‐absorbing
organic
semiconductors
have
opened
up
many
exciting
opportunities
for
photovoltaic
(OPV)
research.
For
example,
new
chemistries
and
synthetical
methodologies
been
developed;
especially,
the
breakthrough
Y‐series
acceptors,
originally
invented
by
our
group,
specifically
Y1,
Y3,
Y6,
contributed
immensely
to
boosting
single‐junction
solar
cell
efficiency
around
19%;
novel
device
architectures
such
as
tandem
transparent
photovoltaics
realized.
The
concept
of
NIR
donors/acceptors
thus
becomes
a
turning
point
in
OPV
field.
Here,
development
NIR‐absorbing
materials
OPVs
is
reviewed.
According
low‐energy
absorption
window,
here,
(p‐type
(polymers)
n‐type
(fullerene
nonfullerene))
are
classified
into
four
categories:
700–800
nm,
800–900
900–1000
greater
than
1000
nm.
Each
subsection
covers
design,
synthesis,
utilization
various
types
donor
(D)
acceptor
(A)
units.
structure–property
relationship
between
kinds
D,
A
units
window
constructed
satisfy
requirements
different
applications.
Subsequently,
variety
applications
realized
materials,
including
OPVs,
photodetectors,
presented.
Finally,
challenges
future
next‐generation
beyond
discussed.
Advanced Functional Materials,
Год журнала:
2021,
Номер
31(27)
Опубликована: Апрель 22, 2021
Abstract
A
series
of
tetrathiophene‐based
fully
non‐fused
ring
acceptors
(4T‐1,
4T‐2,
4T‐3,
and
4T‐4),
which
can
be
paired
with
the
star
donor
polymer
PBDB‐T
to
fabricate
highly
efficient
organic
solar
cells
are
developed.
Tailoring
size
lateral
chains
tune
solubility
packing
mode
acceptor
molecules
in
neat
blend
films.
It
is
found
that
incorporation
2‐ethylhexyl
effectively
change
compatibility
PBDB‐T,
an
encouraging
power
conversion
efficiency
10.15%
accomplished
by
4T‐3‐based
cells.
also
presents
good
other
even
higher
(PCE)
12.04%
achieved
based
on
D18:4T‐3
blend,
champion
PCE
for
acceptors.
Importantly,
these
inexpensive
tetrathiophene
provide
cost‐effective
photovoltaic
performance.
The
results
demonstrate
a
high
performance
from
synthetically
materials
could
rational
design
molecules.
Angewandte Chemie International Edition,
Год журнала:
2022,
Номер
62(5)
Опубликована: Ноя. 26, 2022
Searching
the
cost-effective
organic
semiconductors
is
strongly
needed
in
order
to
facilitate
practice
of
solar
cells
(OSCs),
yet
be
fulfilled.
Herein,
we
have
succeeded
developing
two
non-fused
ring
electron
acceptors
(NFREAs),
leading
highest
efficiency
16.2
%
for
NFREA
derived
OSCs.
These
OSCs
exhibit
superior
operational
stabilities
under
one
sun
equivalent
illumination
without
ultraviolet
(UV)
filtration.
It
revealed
that
modulation
halogen
substituents
on
aromatic
side
chains,
as
new
structural
tool
tune
intermolecular
interaction
and
optoelectronic
properties
acceptors,
not
only
promotes
interlocked
tic-tac-toe
frame
three-dimensional
stacks
solid,
but
also
improves
charge
dynamics
enable
high-performance
stable
Journal of the American Chemical Society,
Год журнала:
2021,
Номер
143(11), С. 4281 - 4289
Опубликована: Март 4, 2021
The
emerging
donor–acceptor–donor
(A-D-A)-type
nonfullerene
acceptors
(NFAs)
featuring
near-infrared
(NIR)
photoresponsivity
have
greatly
boosted
the
development
of
organic
photovoltaics
(OPVs)
and
display
great
potential
for
sensitive
NIR
photodetectors
(OPDs).
However,
NFAs
with
absorption
above
1000
nm,
which
is
importance
application
in
OPDs
bioimaging,
remote
communication,
night
surveillance,
etc.,
are
still
rare
due
to
scarcity
strong
electron-rich
cores.
We
report
herein
a
new
dithiophene
building
block,
namely
PDT,
exhibits
strongest
electron-donating
ability
among
widely
used
blocks.
By
applying
PDT
PDTT
as
cores
DFIC
electron-accepting
terminals,
we
developed
two
electron
acceptors,
PDTIC-4F
PDTTIC-4F,
optical
absorptions
up
1030
surpassing
that
well-known
O6T-4F
acceptor.
In
comparison
carbon–oxygen-bridged
core
COi8
O6T-4F,
synthetic
complexity
significantly
reduced.
Conventional
OPV
devices
based
on
PM6:PDTTIC-4F
power
conversion
efficiencies
(PCEs)
10.70%
broad
external
quantum
efficiency
(EQE)
response
from
ultraviolet–visible
infrared,
leading
high
short-circuit
current
density
(Jsc)
25.90
mA
cm–2.
Encouraged
by
these
results,
investigated
inverted
PM6:PDTTIC-4F-based
OPD
suppressing
dark
via
modulation
film
thickness.
optimal
device
compelling
performance
metrics
can
compete
those
commercial
silicon
photodiodes:
record
responsivity
0.55
A
W–1
(900
nm)
photodiode-type
excellent
shot-noise-limited
specific
detectivity
(Dsh*)
over
1013
jones.
Advanced Energy Materials,
Год журнала:
2021,
Номер
11(11)
Опубликована: Янв. 27, 2021
Abstract
Semi‐transparent
organic
photovoltaics
(ST‐OPVs)
are
promising
solar
windows
for
building
integration.
Improving
the
light‐absorbing
selectivity,
that
is,
transmitting
visible
photons
while
absorbing
invisible
ones,
is
a
key
step
toward
high‐performance
ST‐OPV.
To
achieve
this
goal,
optical
properties
of
active
layer,
transparent
electrode,
and
capping
layer
comprehensively
tailored,
highly
efficient
ST‐OPV
with
good
selectivity
demonstrated.
First,
numerical
method
established
to
quantify
materials
devices,
based
on
which,
an
infrared
non‐fullerene
acceptor,
H3,
selected
among
large
pool
photo‐active
materials.
Second,
ultra‐smooth
thin
Ag
small
granule
size
developed
via
polyethylenimine
wetting,
which
alleviates
light
scattering
improves
electric
Finally,
as
guided
by
simulation,
TeO
2
deposited
top
ultra‐thin
further
improve
selectivity.
As
result,
utilization
efficiency
significantly
improved
3.95
±
0.02%
(best
≈4.06%),
color
rendering
index
76.85.
These
results
make
it
one
best
color‐neutral
ST‐OPVs.
This
work
stresses
importance
manipulating
