Small,
Journal Year:
2019,
Volume and Issue:
15(21)
Published: April 16, 2019
The
quest
for
sustainable
energy
sources
has
led
to
accelerated
growth
in
research
of
organic
solar
cells
(OSCs).
A
solution-processed
bulk-heterojunction
(BHJ)
OSC
generally
contains
a
donor
and
expensive
fullerene
acceptors
(FAs).
last
20
years
have
been
devoted
by
the
community
developing
materials,
specifically
low
bandgap
polymers,
complement
FAs
BHJs.
current
improvement
from
≈2.5%
2013
17.3%
2018
performance
is
primarily
credited
novel
nonfullerene
(NFA),
especially
fused
ring
electron
(FREAs).
FREAs
offer
unique
advantages
over
FAs,
like
broad
absorption
radiation,
they
can
be
extensively
chemically
manipulated
tune
optoelectronic
morphological
properties.
Herein,
status
FREA-based
OSCs
summarized,
such
as
design
strategies
both
wide
narrow
BHJ,
all-small-molecule
OSCs,
semi-transparent
OSC,
ternary,
tandem
cells.
photovoltaics
parameters
are
summarized
discussed.
focus
on
various
FREA
structures
their
role
optical
tuning.
Besides,
drawbacks
NFAs
Finally,
an
outlook
field
FREA-OSCs
future
material
challenges
ahead
provided.
Advanced Materials,
Journal Year:
2019,
Volume and Issue:
31(46)
Published: Sept. 30, 2019
Abstract
Currently,
n‐type
acceptors
in
high‐performance
all‐polymer
solar
cells
(all‐PSCs)
are
dominated
by
imide‐functionalized
polymers,
which
typically
show
medium
bandgap.
Herein,
a
novel
narrow‐bandgap
polymer,
poly(5,6‐dicyano‐2,1,3‐benzothiadiazole‐
alt
‐indacenodithiophene)
(DCNBT‐IDT),
based
on
dicyanobenzothiadiazole
without
an
imide
group
is
reported.
The
strong
electron‐withdrawing
cyano
functionality
enables
DCNBT‐IDT
with
character
and,
more
importantly,
alleviates
the
steric
hindrance
associated
typical
groups.
Compared
to
benchmark
poly(naphthalene
diimide‐
‐bithiophene)
(N2200),
shows
narrower
bandgap
(1.43
eV)
much
higher
absorption
coefficient
(6.15
×
10
4
cm
−1
).
Such
properties
elusive
for
polymer
date,
eradicating
drawbacks
inherited
N2200
and
other
acceptors.
When
blended
wide‐bandgap
donor,
DCNBT‐IDT‐based
all‐PSCs
achieve
remarkable
power
conversion
efficiency
of
8.32%
small
energy
loss
0.53
eV
photoresponse
up
870
nm.
greatly
outperforms
those
(6.13%)
naphthalene
diimide
(NDI)‐based
analog
NDI‐IDT
(2.19%).
This
work
breaks
long‐standing
bottlenecks
limiting
materials
innovation
paves
new
avenue
developing
improved
optoelectronic
heralds
brighter
future
all‐PSCs.
Journal of Materials Chemistry A,
Journal Year:
2019,
Volume and Issue:
7(40), P. 22701 - 22729
Published: Jan. 1, 2019
Non-fullerene
organic
solar
cells
employing
small
molecule
acceptors
have
recently
crossed
the
PCE
of
17%
through
design
and
synthesis
efficient
acceptor
materials.
Physical Review Applied,
Journal Year:
2019,
Volume and Issue:
11(2)
Published: Feb. 25, 2019
The
energy
loss
${E}_{l\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}s\phantom{\rule{0}{0ex}}s}$
seen
in
organic
photovoltaics
sets
a
fundamental
limit
to
their
open-circuit
voltage,
and
hence
power
conversion
efficiency.
This
study
compares
molecular
structures
of
fullerene
nonfullerene
acceptors
quantifies
the
relationship
between
${E}_{l\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}s\phantom{\rule{0}{0ex}}s}$,
exciton
binding
energy,
intra-
intermolecular
electron-phonon
couplings.
Molecular
design
strategies
derived
from
this
analysis
provide
elementary
approaches
reduce
yet
also
achieve
efficient
dissociation.
While
addressing
source
is
particularly
relevant
for
solar
cells,
it
has
wide-ranging
implications
any
system
with
an
heterojunction.
Advanced Energy Materials,
Journal Year:
2020,
Volume and Issue:
10(26)
Published: Feb. 3, 2020
Abstract
Electron
beam
microscopy
and
related
characterization
techniques
play
an
important
role
in
revealing
the
microstructural,
morphological,
physical,
chemical
information
of
halide
perovskites
their
impact
on
associated
optoelectronic
devices.
However,
electron
irradiation
usually
causes
damage
to
these
beam‐sensitive
materials,
negatively
impacting
device
performance,
complicating
this
interpretation.
In
article,
spectroscopy
are
reviewed
that
crucial
for
understanding
crystallization
microstructure
perovskites.
addition,
special
attention
is
paid
assessing
mitigating
beam‐induced
caused
by
techniques.
Since
fragile,
a
protocol
involving
delicate
control
both
dose
rate,
coupled
with
careful
data
analysis,
key
enable
acquisition
reliable
structural
compositional
such
as
atomic‐resolution
images,
elemental
mapping
diffraction
patterns.
Limiting
critical
parameter
enabling
various
Novel
methods
unveil
mechanisms
operation,
including
charge
carrier
generation,
diffusion,
extraction
presented
scanning
studies
combined
electron‐beam‐induced
current
cathodoluminescence
mapping.
Future
opportunities
electron‐beam‐related
characterizations
also
discussed.
Solar RRL,
Journal Year:
2020,
Volume and Issue:
4(7)
Published: April 18, 2020
Compared
with
conventional
inorganic
solar
cells
(ISCs),
energy
loss
(
E
)
in
organic
(OSCs)
is
usually
much
higher,
limiting
their
maximum
achievable
power
conversion
efficiency
(PCE).
In
view
of
this,
a
hot
topic
OSC
research
how
to
make
as
low
possible.
To
date,
some
typical
donor/acceptor
(D/A)
blends,
although
has
been
reduced
the
values
comparable
those
ISCs,
PCEs
corresponding
devices
still
fails
meet
expectations.
One
crucial
issue
that
physics
behind
photovoltaic
process
these
D/A
blends
and
remain
unclear.
Herein,
combining
an
analysis
OSCs,
mechanisms
different
pathways
are
first
discussed.
On
this
basis,
recent
advances
focusing
on
systematically
summarized
according
strategies:
1)
optimizing
offset
blend;
2)
morphology
3)
ternary
modulation;
4)
spin
modulation.
Finally,
summary
prospects
presented,
where
fundamental
questions
be
cleared
up
proposed,
such
more
targeted
design
can
carried
out
future
investigations
OSCs.
Journal of Materials Chemistry A,
Journal Year:
2018,
Volume and Issue:
6(32), P. 15433 - 15455
Published: Jan. 1, 2018
This
review
gives
an
in-depth
understanding
of
structure–performance
relationships
achieved
from
fused-ring
based
nonfullerene
acceptors
with
perpendicular
side-chains.
