Journal of the American Chemical Society,
Journal Year:
2019,
Volume and Issue:
141(19), P. 7743 - 7750
Published: April 22, 2019
Although
significant
improvements
have
been
achieved
for
organic
photovoltaic
cells
(OPVs),
the
top-performing
devices
still
show
power
conversion
efficiencies
far
behind
those
of
commercialized
solar
cells.
One
main
reasons
is
large
driving
force
required
separating
electron–hole
pairs.
Here,
we
demonstrate
an
efficiency
14.7%
in
single-junction
OPV
by
using
a
new
polymer
donor
PTO2
and
nonfullerene
acceptor
IT-4F.
The
device
possesses
efficient
charge
generation
at
low
force.
Ultrafast
transient
absorption
measurements
probe
formation
loosely
bound
pairs
with
extended
lifetime
that
impedes
recombination
carriers
blend.
theoretical
studies
reveal
molecular
electrostatic
potential
(ESP)
between
IT-4F
large,
induced
intermolecular
electric
field
may
assist
generation.
results
suggest
OPVs
further
improvement
judicious
modulation
ESP.
National Science Review,
Journal Year:
2019,
Volume and Issue:
7(7), P. 1239 - 1246
Published: Dec. 5, 2019
Abstract
The
development
of
organic
photoactive
materials,
especially
the
newly
emerging
non-fullerene
electron
acceptors
(NFAs),
has
enabled
rapid
progress
in
photovoltaic
(OPV)
cells
recent
years.
Although
power
conversion
efficiencies
(PCEs)
top-performance
OPV
have
surpassed
16%,
devices
are
usually
fabricated
via
a
spin-coating
method
and
not
suitable
for
large-area
production.
Here,
we
demonstrate
that
fine-modification
flexible
side
chains
NFAs
can
yield
17%
PCE
cells.
More
crucially,
as
optimal
NFA
solubility
thus
desirable
morphology,
high
spin-coated
be
maintained
when
using
scalable
blade-coating
processing
technology.
Our
results
suggest
optimization
chemical
structures
materials
improve
device
performance.
This
great
significance
larger-area
production
technologies
provide
important
scientific
insights
commercialization
Nature Communications,
Journal Year:
2020,
Volume and Issue:
11(1)
Published: Aug. 6, 2020
Abstract
Dielectric
polymers
for
electrostatic
energy
storage
suffer
from
low
density
and
poor
efficiency
at
elevated
temperatures,
which
constrains
their
use
in
the
harsh-environment
electronic
devices,
circuits,
systems.
Although
incorporating
insulating,
inorganic
nanostructures
into
dielectric
promotes
temperature
capability,
scalable
fabrication
of
high-quality
nanocomposite
films
remains
a
formidable
challenge.
Here,
we
report
an
all-organic
composite
comprising
blended
with
high-electron-affinity
molecular
semiconductors
that
exhibits
concurrent
high
(3.0
J
cm
−3
)
discharge
(90%)
up
to
200
°C,
far
outperforming
existing
polymer
nanocomposites.
We
demonstrate
immobilize
free
electrons
via
strong
attraction
impede
electric
charge
injection
transport
polymers,
leads
substantial
performance
improvements.
The
composites
can
be
fabricated
large-area
uniform
capacitive
performance,
is
crucially
important
successful
commercialization
practical
application
high-temperature
electronics
devices.
Journal of the American Chemical Society,
Journal Year:
2019,
Volume and Issue:
141(19), P. 7743 - 7750
Published: April 22, 2019
Although
significant
improvements
have
been
achieved
for
organic
photovoltaic
cells
(OPVs),
the
top-performing
devices
still
show
power
conversion
efficiencies
far
behind
those
of
commercialized
solar
cells.
One
main
reasons
is
large
driving
force
required
separating
electron–hole
pairs.
Here,
we
demonstrate
an
efficiency
14.7%
in
single-junction
OPV
by
using
a
new
polymer
donor
PTO2
and
nonfullerene
acceptor
IT-4F.
The
device
possesses
efficient
charge
generation
at
low
force.
Ultrafast
transient
absorption
measurements
probe
formation
loosely
bound
pairs
with
extended
lifetime
that
impedes
recombination
carriers
blend.
theoretical
studies
reveal
molecular
electrostatic
potential
(ESP)
between
IT-4F
large,
induced
intermolecular
electric
field
may
assist
generation.
results
suggest
OPVs
further
improvement
judicious
modulation
ESP.
