Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 16, 2024
Abstract
Lead
halide
perovskite
nanocrystals
(NCs)
rapidly
emerge
as
promising
materials
for
photovoltaics.
However,
to
fully
harness
their
potential,
efficient
charge
extraction
is
crucial.
Despite
rapid
advancements,
the
specific
active
sites
where
acceptor
molecules
interact
remain
inadequately
understood.
Surface
chemistry
and
interfacial
properties
are
pivotal,
they
directly
impact
transfer
efficiency
overall
device
performance.
This
study
identifies
maps
binding
hole
transporters,
examining
influence
on
dynamics
through
ligand
engineering
with
2,3‐dimercaptopropanol
(DMP),
a
compound
strong
affinity
lead
(Pb).
DMP
effectively
passivates
Pb
in
CsPbBr
3
(CPB)
NCs,
enhancing
photoluminescence
(PL)
by
forming
stable
chelating
bonds.
DMP‐modified
CPB
nearly
completely
suppresses
─COOH‐functionalized
ferrocene
(FcA)
partially
─NMe
2
‐functionalized
(FcAm),
suggesting
an
alternative
pathway
FcAm.
further
supported
enhanced
bromine‐excess
(CPB‐Br(XS))
synthesized
via
SOBr
treatment.
The
distinct
interactions
validated
steady‐state
time‐resolved
PL,
along
transient
absorption
spectroscopy.
These
findings
underscore
role
of
strategic
NC‐charge
interactions,
enabling
better
extraction,
higher
solar
cell
efficiency,
reduced
toxicity
binding.
Small Methods,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Feb. 20, 2024
Abstract
Perovskite
nanocrystals
are
embedded
into
metal–organic
frameworks
(MOFs)
to
create
composites
with
high
light
absorption
coefficients,
tunable
electronic
properties,
specific
surface
area,
and
metal
atom
tunability
for
enhanced
photocatalytic
carban
dioxide
(CO
2
)
reduction.
However,
existing
perovskite‐MOF
structures
a
large
particle
size
achieved
based
on
Pb
source
adsorption
the
pores
of
MOFs,
which
can
significantly
break
down
porous
structure,
thereby
resulting
in
decreased
area
impacting
CO
adsorption.
Herein,
novel
structure
synthesis
bimetallic
Pb‐containing
MOFs
post‐processing
convert
CsPbBr
3
(NCs)
is
proposed.
It
discovered
that
additional
not
introduced
by
adsorption,
but
instead
engages
coordination
generates
Pb‐N.
The
produced
ZIF‐8@CsPbBr
NCs
≈40
nm
have
an
ultra‐high
1325.08
m
g
−1
,
excellent
photovoltaic
characteristics,
beneficial
conversion
rate
450
mol
h
more
than
three
times
pure
perovskites.
Additionally,
superior
reduction
capacity
sustained
after
undergoing
four
cycles.
Density
Functional
Thoery
(DFT)
simulations
used
explore
3D
charge
density
at
interface
better
understand
electrical
structure.
Small,
Journal Year:
2024,
Volume and Issue:
20(35)
Published: April 16, 2024
Lead
halide
perovskite
nanocrystals
(LHP
NCs)
have
garnered
attention
as
promising
light-harvesting
materials
for
optoelectronics
and
photovoltaic
devices,
attributed
to
their
impressive
optoelectronic
properties.
However,
susceptibility
moisture-induced
degradation
has
hindered
practical
applications.
Despite
various
encapsulation
strategies,
challenges
persist
in
maintaining
stability
performance
simultaneously.
Here,
a
ligand
exchange
approach
is
proposed
using
(11-mercaptoundecyl)-N,N,N-trimethylammonium
bromide
(MUTAB)
enhance
the
dispersibility
of
CsPbBr
Metal
halide
perovskite
nanocrystals
(NCs),
known
for
their
strong
visible-light
absorption
and
tunable
optoelectronic
properties,
show
significant
promise
photocatalytic
applications.
However,
efficiency
is
often
hindered
by
rapid
charge
recombination
insufficient
exciton
dissociation,
limiting
effective
catalysis.
Excited-state
interactions
at
the
NC
interface
are
critical
in
determining
performance,
underscoring
need
strategies
that
enhance
separation
minimize
recombination.
To
address
these
challenges,
we
developed
a
composite
material
combining
cesium
lead
bromide
(CsPbBr3)
with
ferrocene
carboxylic
acid
(FcA),
hole-extracting
moiety.
This
integration
enhances
dissociation
through
energy
level
alignment
suppression,
resulting
3-fold
increase
oxidation
yield
of
benzylamine
to
N-benzylidenebenzylamine
(35
±
5%
versus
12
2%
pristine
CsPbBr3).
Additionally,
thionyl
(SOBr2)
surface
modification
strips
off
ligands
introduces
ions
onto
CsPbBr3
NCs,
further
improving
transfer
substrate
accessibility,
27
within
3
h.
While
SOBr2
treatment
initial
catalytic
its
acidic
nature
may
reversible
reactions
side
products
over
extended
reaction
times.
study
highlights
impact
molecular
engineering
on
optimizing
interfacial
dynamics,
providing
pathway
toward
robust,
high-efficiency
photocatalysts
sustainable
chemical
transformations.
ACS Applied Nano Materials,
Journal Year:
2024,
Volume and Issue:
7(14), P. 16913 - 16921
Published: July 16, 2024
Metal
halide
perovskite
nanocrystals
(NCs)
possess
immense
potential
in
photocatalysis.
However,
deciphering
the
intricate
surface
chemistry
that
governs
these
catalytic
processes
remains
a
challenge.
This
study
investigates
C–X
bond
activation
with
CsPbBr3
NCs,
focusing
on
elucidating
role
of
dynamic
molecular
domains
dictating
activity.
By
manipulating
interactions
through
ligand
dynamics,
we
identify
vacancies
as
critical
sites
for
activation.
A
systematic
exploration
different
types
reveals
varying
kinetics
exchange,
oleyl
amine-capped
NCs
demonstrating
highest
reactivity.
Temperature-dependent
photoluminescence
measurements
corroborate
findings,
highlighting
influence
dynamics
interactions.
Additionally,
postsynthetic
treatments,
such
lead
oleate
modification,
which
leads
to
an
increase
density
active
(halide
vacancies),
significantly
enhance
performance.
Conversely,
SOBr2
treatment,
repairs
bromide
vacancies,
results
almost
completely
suppressed
So,
by
engineering
environments,
demonstrate
significant
improvement
performance
metal
offering
valuable
insights
future
development.
Journal of Materials Chemistry A,
Journal Year:
2023,
Volume and Issue:
11(25), P. 13289 - 13299
Published: Jan. 1, 2023
Ferrocene
derivatives
have
been
recognized
as
a
new
hole-transporting
layer
(HTL),
imparting
stability,
enhanced
charge
separation,
and
transport
properties
at
the
perovskite/HTL
interface.
ACS Applied Energy Materials,
Journal Year:
2023,
Volume and Issue:
6(15), P. 8091 - 8101
Published: July 21, 2023
Efficient
charge
extraction
in
lead
halide
perovskite
nanocrystals
is
frequently
sought-after
and
probed
using
various
probe
molecules.
Often
ignored,
the
chemical
bonding
of
molecules
to
perovskite's
surface,
as
dictated
by
terminal
anchoring
functional
group,
can
have
implications
on
excited-state
interactions
between
charge-shuttling
Considering
remarkability
recent
work
ferrocene-based
allowing
transfer
nanocrystals,
we
employed
ferrocene
molecule
functionalized
with
groups
understand
binding
charge-transfer
process
at
interface
nanocrystal
redox
relay
molecule.
We
evidenced
that
enhanced
enhancement
binding,
validated
association
constant
evaluated
high
1.71
×
107
M–1.
In
particular,
−COOH
−NMe2
led
efficient
quenching
photoluminescence
(PL)
emission
a
decrease
lifetime
than
other
group
analogues,
showing
their
feasibility
studies.
More
importantly,
indicated
passivation
defects
attributed
interaction
lone
pair
nitrogen
undercoordinated
surface
Pb2+
cations.
This
was
also
evident
transient
absorption
spectra,
where
could
be
analyzed
better.
opens
avenues
for
exploring
moieties
facilitating
across
interface,
thus
impacting
its
photocatalytic
applications.
ACS Nano,
Journal Year:
2023,
Volume and Issue:
18(1), P. 1084 - 1097
Published: Dec. 27, 2023
Water
instability
and
sensing
homogeneity
are
the
Achilles'
heel
of
CsPbX3
NPs
in
biological
fluids
application.
This
work
reports
preparation
Mn2+:CsPbCl3@SiO2
yolk–shell
nanoparticles
(YSNPs)
aqueous
solutions
created
through
integration
ligand,
surface,
crystal
engineering
strategies.
The
SN2
reaction
between
4-chlorobutyric
acid
(CBA)
oleylamine
(OAm)
yields
a
zwitterionic
ligand
that
facilitates
dispersion
YSNPs
water,
while
robust
SiO2
shell
enhances
their
overall
stability.
Besides,
Mn2+
doping
not
only
introduces
second
emission
center
but
also
enables
potential
postsynthetic
designability,
leading
to
switching
from
MnO2@YSNPs
with
excellent
oxidase
(OXD)-like
activity.
Theoretical
calculations
reveal
electron
transfer
CsPbCl3
situ
MnO2
adsorption–desorption
process
3,3′,5,5′-tetramethylbenzidine
(TMB)
synergistically
amplify
OXD-like
In
presence
ascorbic
(AA),
Mn4+
(fluorescent
nanozyme)
is
reduced
dissociated,
thereby
inhibiting
activity
triggering
fluorescence
"turn-on/off",
i.e.,
dual-mode
recognition.
Finally,
biomarker
reporting
platform
based
on
fluorescent
nanozyme
constructed
AA
as
reporter
molecule,
accurate
detection
human
serum
alkaline
phosphatase
(ALP)
realized,
demonstrating
vast
perovskites
biosensing.
Chemical Communications,
Journal Year:
2024,
Volume and Issue:
60(17), P. 2365 - 2368
Published: Jan. 1, 2024
This
study
highlights
CsPbBr
3
nanocrystals
as
a
potent
photocatalyst
for
oxidative
coupling
of
primary
amines
to
imines,
where
interfacial
interactions
markedly
impact
the
reaction
yield.
Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(43), P. 13718 - 13726
Published: Oct. 15, 2024
Halide
perovskite
nanocrystals
(HPNCs)
have
emerged
as
promising
materials
for
various
light
harvesting
applications
due
to
their
exceptional
optical
and
electronic
properties.
However,
inherent
instability
in
water
biological
fluids
has
limited
use
photocatalysts
the
aqueous
phase.
In
this
study,
we
present
highly
water-stable
SiO2-coated
HPNCs
efficient
antimicrobial
applications.
The
double
SiO2
layer
coating
method
confers
long-term
structural
stability
water,
while
situ
synthesis
of
lead-
bismuth-based
NCs
into
shell
enhances
versatility
tunability.
We
demonstrate
that
substantial
generation
singlet
oxygen
via
energy
transfer
from
enables
photoinduced
antibacterial
efficacy
under
conditions.
More
than
90%
Escherichia
coli
was
inactivated
mild
visible
irradiation
6
h.
excellent
photocatalytic
performance
suggests
hold
great
potential
phase
