Abstract
Achieving
high‐performance
organic
solar
cells
(OSCs)
relies
heavily
on
precise
morphology
optimization,
a
challenging
task
due
to
the
intrinsic
differences
in
crystallization
kinetics
and
interfacial
compatibility
between
polymer
donors
small‐molecule
acceptors.
In
this
work,
2,7‐dibromonaphthalene
(DBN)
is
introduced
as
an
innovative
solid
additive
that
uniquely
regulates
both
donor
acceptor
phases
within
PM6:Y6
system.
Unlike
conventional
liquid
additives,
which
often
induce
excessive
Y6
crystallization,
DBN
achieves
balanced
enhancing
molecular
order
PM6
while
mitigating
over‐aggregation
Y6.
This
dual‐phase
effect
improves
light
absorption,
exciton
generation
dissociation,
charge
transport,
reduces
recombination
losses.
As
result,
OSCs
treated
with
achieved
remarkable
power
conversion
efficiency
(PCE)
of
18.5%,
open‐circuit
voltage
(
V
OC
)
0.848
V,
high
short‐circuit
current
density
J
SC
28.15
mA
cm
−2
,
enhanced
fill
factor
(FF)
77.7%.
Adding
anti‐reflection
MgF
2
layer
further
boosts
19.0%,
setting
new
benchmark
for
binary
devices.
study
establishes
promising
regulator
presents
robust
strategy
control,
advancing
development
photovoltaic
applications.
Abstract
In
organic
solar
cells
(OSCs),
electron
acceptors
have
undergone
multiple
updates,
from
the
initial
fullerene
derivatives,
to
later
acceptor‐donor‐acceptor
type
non‐fullerene
(NFAs),
and
now
Y‐series
NFAs,
based
on
which
efficiencies
reached
over
19%.
However,
key
property
responsible
for
further
improved
efficiency
molecular
structure
design
is
remained
unclear.
Herein,
material
properties
are
comprehensively
scanned
by
selecting
PC
71
BM,
IT‐4F,
L8‐BO
as
representatives
different
development
stages
of
acceptors.
For
comparison,
asymmetric
acceptor
BTP‐H5
with
desired
loosely
bounded
excitons
designed
synthesized.
It's
identified
that
reduction
intrinsically
exciton
binding
energy
(
E
b
)
enhancement
delocalization
capability
act
roles
in
boosting
performance.
Notably,
100
meV
has
been
observed
BM
BTP‐H5,
correspondingly,
electron‐hole
pair
distance
almost
two
times
BM.
As
a
result,
40%
S‐Q
limit
BM‐based
OSC
60%
BTP‐H5‐based
one,
achieves
an
19.07%,
among
highest
values
binary
OSCs.
This
work
reveals
confirmed
function
quantitatively
pushing
OSCs,
thus
providing
enlightenment
future
design.
Macromolecular Rapid Communications,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 18, 2024
The
fabrication
of
the
flexible
devices
with
excellent
photovoltaic
performance
and
stability
is
critical
for
commercialization
organic
solar
cells
(OSCs).
Herein,
conjugated
dimer
acceptor
DY-TVCl
non-conjugated
DY-3T
based
on
monomer
MY-BO
are
synthesized
to
regulate
molecular
glass
transition
temperatures
(T
Abstract
Achieving
high‐performance
organic
solar
cells
(OSCs)
relies
heavily
on
precise
morphology
optimization,
a
challenging
task
due
to
the
intrinsic
differences
in
crystallization
kinetics
and
interfacial
compatibility
between
polymer
donors
small‐molecule
acceptors.
In
this
work,
2,7‐dibromonaphthalene
(DBN)
is
introduced
as
an
innovative
solid
additive
that
uniquely
regulates
both
donor
acceptor
phases
within
PM6:Y6
system.
Unlike
conventional
liquid
additives,
which
often
induce
excessive
Y6
crystallization,
DBN
achieves
balanced
enhancing
molecular
order
PM6
while
mitigating
over‐aggregation
Y6.
This
dual‐phase
effect
improves
light
absorption,
exciton
generation
dissociation,
charge
transport,
reduces
recombination
losses.
As
result,
OSCs
treated
with
achieved
remarkable
power
conversion
efficiency
(PCE)
of
18.5%,
open‐circuit
voltage
(
V
OC
)
0.848
V,
high
short‐circuit
current
density
J
SC
28.15
mA
cm
−2
,
enhanced
fill
factor
(FF)
77.7%.
Adding
anti‐reflection
MgF
2
layer
further
boosts
19.0%,
setting
new
benchmark
for
binary
devices.
study
establishes
promising
regulator
presents
robust
strategy
control,
advancing
development
photovoltaic
applications.
