ACS Energy Letters,
Год журнала:
2023,
Номер
8(10), С. 4386 - 4396
Опубликована: Сен. 27, 2023
Perovskite
quantum
dots
(PQDs)
have
emerged
as
one
of
the
most
promising
optoelectronic
materials.
However,
oleic
acid
(OA)/oleylamine
(OAm)
ligands
significantly
suffer
from
detachment
PQD
surface
due
to
reversible
protonated
and
deprotonated
processes
OA
OAm
ligands,
predominantly
affecting
properties
PQDs.
Herein,
an
in
situ
ligand
compensation
(ILC)
strategy
is
demonstrated
repair
defective
PQDs
through
a
nucleophilic
substitution
reaction,
which
could
simultaneously
passivate
cesium
bromide
ion
vacancies
on
surface,
substantially
suppressing
defect-assisted
nonradiative
recombination.
Meanwhile,
ILC
treatment
would
also
dynamically
remove
part
pristine
OA/OAm
improves
electronic
coupling
crystalline
orientation
PQDs,
thereby
facilitating
charge
transport
within
solids.
Consequently,
PQD-based
light-emitting
diode
yields
external
efficiency
up
23.45%
with
highest
luminance
109427
cd
m–2,
among
values
green-emitting
diodes.
Abstract
Ligands
are
indispensable
for
perovskite
nanocrystals
(NCs)
throughout
the
whole
lifetime,
as
they
not
only
play
key
roles
in
controllable
synthesis
of
NCs
with
different
sizes
and
shapes,
but
also
act
capping
shell
that
affects
optical
properties
electrical
coupling
NCs.
Establishing
a
systematic
understanding
relationship
between
ligands
is
significant
to
enable
many
potential
applications
This
review
mainly
focuses
on
influence
First
all,
ligands‐dominated
size
shape
control
discussed.
Whereafter,
surface
defects
bonding
classified,
corresponding
post‐treatment
via
summarized.
Furthermore,
advances
engineering
towards
high
performance
optoelectronic
devices
based
NCs,
including
photodetector,
solar
cell,
light
emitting
diode
(LED),
laser,
finally
challenges
Nano-Micro Letters,
Год журнала:
2023,
Номер
15(1)
Опубликована: Июнь 29, 2023
All-inorganic
CsPbI3
quantum
dots
(QDs)
have
demonstrated
promising
potential
in
photovoltaic
(PV)
applications.
However,
these
colloidal
perovskites
are
vulnerable
to
the
deterioration
of
surface
trap
states,
leading
a
degradation
efficiency
and
stability.
To
address
issues,
facile
yet
effective
strategy
introducing
hydroiodic
acid
(HI)
into
synthesis
procedure
is
established
achieve
high-quality
QDs
devices.
Through
an
in-depth
experimental
analysis,
introduction
HI
was
found
convert
PbI2
highly
coordinated
[PbIm]2−m,
enabling
control
nucleation
numbers
growth
kinetics.
Combined
optical
structural
investigations
illustrate
that
such
technique
beneficial
for
achieving
enhanced
crystallinity
reduced
density
crystallographic
defects.
Finally,
effect
further
reflected
on
PV
performance.
The
optimal
device
significantly
improved
power
conversion
15.72%
along
with
storage
This
illuminates
novel
simple
methodology
regulate
formed
species
during
synthesis,
shedding
light
understanding
solar
cell
performance,
aiding
design
future
protocols
high-performance
optoelectronic
ACS Energy Letters,
Год журнала:
2023,
Номер
8(10), С. 4386 - 4396
Опубликована: Сен. 27, 2023
Perovskite
quantum
dots
(PQDs)
have
emerged
as
one
of
the
most
promising
optoelectronic
materials.
However,
oleic
acid
(OA)/oleylamine
(OAm)
ligands
significantly
suffer
from
detachment
PQD
surface
due
to
reversible
protonated
and
deprotonated
processes
OA
OAm
ligands,
predominantly
affecting
properties
PQDs.
Herein,
an
in
situ
ligand
compensation
(ILC)
strategy
is
demonstrated
repair
defective
PQDs
through
a
nucleophilic
substitution
reaction,
which
could
simultaneously
passivate
cesium
bromide
ion
vacancies
on
surface,
substantially
suppressing
defect-assisted
nonradiative
recombination.
Meanwhile,
ILC
treatment
would
also
dynamically
remove
part
pristine
OA/OAm
improves
electronic
coupling
crystalline
orientation
PQDs,
thereby
facilitating
charge
transport
within
solids.
Consequently,
PQD-based
light-emitting
diode
yields
external
efficiency
up
23.45%
with
highest
luminance
109427
cd
m–2,
among
values
green-emitting
diodes.
