ACS Energy Letters,
Journal Year:
2023,
Volume and Issue:
8(10), P. 4386 - 4396
Published: Sept. 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.
Broadband
photodetection
(PD)
covering
the
deep
ultraviolet
to
near-infrared
(200-1000
nm)
range
is
significant
and
desirable
for
various
optoelectronic
designs.
Herein,
we
employ
(UV)
luminescent
concentrators
(LC),
iodine-based
perovskite
quantum
dots
(PQDs),
organic
bulk
heterojunction
(BHJ)
as
UV,
visible,
(NIR)
photosensitive
layers,
respectively,
construct
a
broadband
PD.
Firstly,
experimental
theoretical
results
reveal
that
properties
stability
of
CsPbI3
PQDs
are
significantly
improved
through
Er3+
doping,
owing
reduced
defect
density,
charge
mobility,
increased
formation
energy,
tolerance
factor,
etc.
The
narrow
bandgap
CsPbI3:Er3+
serves
visible
layer
Secondly,
considering
matchable
energy
bandgap,
BHJ
(BTP-4Cl:
PBDB-TF)
selected
NIR
absorption
fabricate
hybrid
structure
with
PQDs.
Thirdly,
UV
LC
converts
light
(200-400
(400-700
nm),
which
further
absorbed
by
In
contrast
other
perovskites
PDs
commercial
Si
PDs,
our
PD
presents
relatively
wide
response
high
detectivity
especially
in
regions
(two
orders
magnitude
increase
PDs).
Furthermore,
also
demonstrates
enhanced
air-
UV-
stability,
photocurrent
device
maintains
81.5%
original
one
after
5000
cycles.
This
work
highlights
new
attempt
designing
has
application
potential
devices.
Advanced Science,
Journal Year:
2022,
Volume and Issue:
9(7)
Published: Jan. 14, 2022
Perovskite
quantum
dots
(PQDs)
have
captured
a
host
of
researchers'
attention
due
to
their
unique
properties,
which
been
introduced
lots
optoelectronics
areas,
such
as
light-emitting
diodes,
lasers,
photodetectors,
and
solar
cells.
Herein,
the
authors
aim
at
reviewing
achievements
PQDs
applied
cells
in
recent
years.
The
engineering
concerning
surface
ligands,
additives,
hybrid
composition
for
PQDSCs
is
outlined
first,
followed
by
analyzing
reasons
undesired
performance
PQDSCs.
Subsequently,
novel
overview
that
are
utilized
improve
photovoltaic
various
kinds
cells,
provided.
Finally,
this
review
summarized
some
challenges
perspectives
also
discussed.
Advanced Materials,
Journal Year:
2022,
Volume and Issue:
34(17)
Published: Jan. 13, 2022
Colloidally
grown
nanosized
semiconductors
yield
extremely
high-quality
optoelectronic
materials.
Many
examples
have
pointed
to
near
perfect
photoluminescence
quantum
yields,
allowing
for
technology-leading
materials
such
as
high
purity
color
centers
in
display
technology.
Furthermore,
because
of
chemical
yield,
and
improved
understanding
the
surfaces,
these
materials,
particularly
colloidal
dots
(QDs)
can
also
be
ideal
candidates
other
applications.
Given
urgent
necessity
toward
carbon
neutrality,
electricity
from
solar
photovoltaics
will
play
a
large
role
power
generation
sector.
QDs
are
developed
shown
dramatic
improvements
over
past
15
years
photoactive
with
various
innovative
deposition
properties
which
lead
exceptionally
low-cost
high-performance
devices.
Once
key
issues
related
charge
transport
optically
thick
arrays
addressed,
QD-based
photovoltaic
technology
become
better
candidate
practical
application.
In
this
article,
authors
show
how
possibilities
different
techniques
bring
cells
industrial
level
discuss
challenges
perovskite
QD
particular,
achieve
large-area
fabrication
further
advancing
solve
pivotal
energy
environmental
issues.
Energy & Environmental Science,
Journal Year:
2022,
Volume and Issue:
15(10), P. 4201 - 4212
Published: Jan. 1, 2022
A
feasible
ligand
riveting
strategy
for
perovskite
quantum
dots
(PQDs)
is
reported
to
substantially
inhibit
the
lattice
distortion
and
simultaneously
efficiently
passivate
surface
of
PQDs
PQD
solar
cells
with
an
efficiency
over
16.6%.
Advanced Materials,
Journal Year:
2023,
Volume and Issue:
35(21)
Published: Feb. 26, 2023
Cesium-formamidinium
lead
iodide
perovskite
quantum
dots
(FAx
Cs1-x
PbI3
PQDs)
show
high
potential
for
next-generation
photovoltaics
due
to
their
outstanding
optoelectronic
properties.
However,
achieving
composition-tunable
hybrid
PQDs
with
desirable
charge
transport
remains
a
significant
challenge.
Herein,
by
leveraging
an
antisolvent-assisted
in
situ
cation
exchange
of
PQDs,
homogeneous
FAx
controllable
stoichiometries
and
surface
ligand
chemistry
are
realized.
Meanwhile,
the
crystallographic
stability
is
substantially
improved
substituting
cations
mediated
vacancies.
Consequently,
PQD
solar
cell
delivers
efficiency
17.29%,
highest
value
among
homostructured
cells.
The
photovoltaic
performance
attributed
broadened
light
harvesting
spectra,
flattened
energy
landscape,
rationalized
levels
highly
oriented
solids,
leading
efficient
carrier
extraction.
This
work
provides
feasible
approach
stoichiometry
regulation
finely
tailor
properties
tolerance
factors
toward
high-performing
photovoltaics.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(25)
Published: March 11, 2024
Abstract
All–inorganic
perovskite
solar
cells
(PSCs),
such
as
CsPbX
3
,
have
garnered
considerable
attention
recently,
they
exhibit
superior
thermodynamic
and
optoelectronic
stabilities
compared
to
the
organic–inorganic
hybrid
PSCs.
However,
power
conversion
efficiency
(PCE)
of
PSCs
is
generally
lower
than
that
PSCs,
contain
higher
defect
densities
at
interface
within
light‐absorbing
layers,
resulting
in
non‐radiative
recombination
voltage
loss.
Consequently,
regulation
has
been
adopted
an
important
strategy
improve
device
performance
stability.
This
review
aims
comprehensively
summarize
recent
progresses
on
well
their
cutting‐edge
applications
extreme
scenarios.
The
underlying
fundamental
mechanisms
leading
formation
crystal
structure
are
firstly
discussed,
overview
literature‐adopted
strategies
context
interface,
internal,
surface
engineering
provided.
Cutting‐edge
environments
outer
space
underwater
situations
highlighted.
Finally,
a
summary
outlook
presented
future
directions
for
achieving
efficiencies
stability
