Nano-Micro Letters,
Год журнала:
2024,
Номер
17(1)
Опубликована: Окт. 10, 2024
Abstract
Layer-structured
Ruddlesden–Popper
(RP)
perovskites
(RPPs)
with
decent
stability
have
captured
the
imagination
of
photovoltaic
research
community
and
bring
hope
for
boosting
development
perovskite
solar
cell
(PSC)
technology.
However,
two-dimensional
(2D)
or
quasi-2D
RP
PSCs
are
encountered
some
challenges
large
exciton
binding
energy,
blocked
charge
transport
poor
film
quality,
which
restrict
their
performance.
Fortunately,
these
issues
can
be
readily
resolved
by
rationally
designing
spacer
cations
RPPs.
This
review
mainly
focuses
on
how
to
design
molecular
structures
organic
spacers
aims
endow
RPPs
outstanding
applications.
We
firstly
elucidated
important
roles
in
impacting
crystallization
kinetics,
transporting
ability
Then
we
brought
three
aspects
attention
spacers.
Finally,
presented
specific
structure
strategies
aiming
improve
performance
PSCs.
These
proposed
this
will
provide
new
avenues
develop
novel
advance
RPP
technology
future
The Journal of Physical Chemistry Letters,
Год журнала:
2023,
Номер
14(35), С. 7860 - 7868
Опубликована: Авг. 28, 2023
The
development
of
broadband
emitters
based
on
metal
halide
perovskites
(MHPs)
requires
the
elucidation
structure–emission
property
correlations.
Herein,
we
report
a
combined
experimental
and
theoretical
study
series
novel
low-dimensional
lead
chloride
perovskites,
including
ditopic
aromatic
cations.
Synthesized
their
bromide
analogues
show
both
narrow
broad
photoluminescence
emission
properties
as
function
cation
nature.
Structural
analysis
shows
correlation
between
rigidity
cations
octahedral
distortions.
Density
functional
theory
calculations
reveal,
in
turn,
pivotal
role
distortions
formation
self-trapped
excitons,
which
are
responsible
for
insurgence
large
Stokes
shifts
together
with
contribution
vacancies.
For
considered
MHP
series,
use
conventional
distortion
parameters
allows
us
to
nicely
describe
trend
properties,
thus
providing
solid
guide
further
materials
design.
Nano Materials Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Март 1, 2024
Incorporating
low-dimensionalization
technologies
effectively
tackle
the
challenge
of
inadequate
long-term
stability
in
hybrid
halide
perovskites,
however
their
wide
bandgap
and
strong
quantum
well
confinement
remain
substantial
obstacle
for
various
optoelectronic
applications.
Addressing
these
issues
without
compromising
has
emerged
as
a
pivotal
focus
materials
science,
particular
exploring
effects
functional
groups
within
spacer
cations.
Our
simulations
reveal
that
robust
π-π
stacking
interactions
involving
PEA+
hydrogen
bonding
between
MX64−
contribute
to
narrowing
electronic
2D
monolayer
PEA2MX4
(e.
g.
PEA2SnI4:
1.34
eV)
reasonable
visible-light
absorption
while
simultaneously
ensuring
favorable
stability.
Moreover,
delocalized
orbitals
relatively
high
dielectric
constants
PEA+,
attributed
conjugated
benzene
ring,
been
observed
weaken
potential
barrier,
exciton
binding
effect
PEA2MX4,
thus
facilitating
photogenerated
electron-hole
separations
out-of-plane
carrier
transport.
The
impact
cations
on
transport
properties
perovskites
highlights
critical
role
meticulously
chosen
well-designed
cations,
especially
groups,
shaping
photophysical
even
under
extremely
operating
conditions.
2D-3D
tin-based
perovskites
are
considered
as
promising
candidates
for
achieving
efficient
lead-free
perovskite
solar
cells
(PSCs).
However,
the
existence
of
multiple
low-dimensional
phases
formed
during
film
preparation
hinders
transport
charge
carriers.
In
addition,
non-homogeneous
distribution
leads
to
lattice
distortion
and
increases
defect
density,
which
undesirable
stability
PSCs.
Here,
mixed
spacer
cations
[diethylamine
(DEA
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 2, 2024
Abstract
As
promising
photovoltaic
materials,
halide
perovskites
display
large
structural
modifiability
specific
to
their
organic‐inorganic
hybrid
lattices,
thus
providing
key
unlock
many
enhanced
and
novel
physical
properties.
In
particular,
exhibit
extraordinary
functional
responses
mechanical
stimulation
due
soft
lattices.
However,
a
general
pattern
describing
the
evolution
of
perovskite
properties
under
pressure
is
missing,
rendering
such
research
without
theoretical
guidance
further
optimization
optoelectronic
performance.
Here,
framework
delineating
pressure‐dependent
evolutions
lattice
structure,
bandgap,
photoluminescence
(PL)
across
four
distinct
regions
in
all
assuming
3D
2D
structures
unveiled,
accrediting
long‐range
disorderness
be
common
origin
bandgap
blueshift,
PL
annihilation,
amorphization.
Using
developed
model
as
an
instructional
guideline,
optical
luminescent
quasi‐2D
tin(II)
iodide
are
revealed,
where
(C
4
H
9
NH
3
)
2
(CH
)Sn
I
7
+
:
butylammonium;
CH
methylammonium)
found
softest
(bulk
modulus
≈4.8
GPa)
known
so
far.
By
meticulously
choosing
appropriate
peak
≈4
GPa,
shows
irreversible
defect
healing
(carrier
lifetime
prolongation
from
22
ns)
permanent
enhancement
upon
decompression
ambient
condition,
signifying
practicality
pressure‐driven
behaviors
unveiled
this
work.
Nano-Micro Letters,
Год журнала:
2024,
Номер
17(1)
Опубликована: Окт. 10, 2024
Abstract
Layer-structured
Ruddlesden–Popper
(RP)
perovskites
(RPPs)
with
decent
stability
have
captured
the
imagination
of
photovoltaic
research
community
and
bring
hope
for
boosting
development
perovskite
solar
cell
(PSC)
technology.
However,
two-dimensional
(2D)
or
quasi-2D
RP
PSCs
are
encountered
some
challenges
large
exciton
binding
energy,
blocked
charge
transport
poor
film
quality,
which
restrict
their
performance.
Fortunately,
these
issues
can
be
readily
resolved
by
rationally
designing
spacer
cations
RPPs.
This
review
mainly
focuses
on
how
to
design
molecular
structures
organic
spacers
aims
endow
RPPs
outstanding
applications.
We
firstly
elucidated
important
roles
in
impacting
crystallization
kinetics,
transporting
ability
Then
we
brought
three
aspects
attention
spacers.
Finally,
presented
specific
structure
strategies
aiming
improve
performance
PSCs.
These
proposed
this
will
provide
new
avenues
develop
novel
advance
RPP
technology
future
