Pressure-induced bandgap narrowing to Shockley–Queisser limit of quasi-two-dimensional perovskite (BA)2(FA)Sn2I7
Applied Physics Letters,
Год журнала:
2025,
Номер
126(17)
Опубликована: Апрель 28, 2025
Quasi-two-dimensional
(2D)
tin-based
perovskites
are
promising
photoelectric
materials
due
to
their
non-toxicity
and
excellent
properties.
However,
the
addition
of
organic
ligands
leads
an
increase
in
bandgap,
which
is
unfavorable
for
application
field
photovoltaics.
The
bandgap
two-dimensional
perovskite
(BA)2(FA)Sn2I7
reduced
Shockley–Queisser
limit
through
pressure.
Also,
decreases
by
0.108
eV/GPa
within
a
pressure
range
0.0–4.0
GPa,
reaching
value
1.34
eV
at
4.0
corresponds
limit.
With
further
increases
above
starts
then
re-decreases
15.0
GPa.
When
released
ambient
pressure,
still
partially
preserved
structural
recrystallization.
Further
analysis
indicated
that
continuous
narrowing
GPa
mainly
layer-to-layer
compression
before
interlayer
sample,
deformation
[SnI6]4−
octahedra.
In
addition,
high-pressure
situ
electrical
tests
show
exhibits
optical
response
under
laser
irradiation
405,
450,
980,
1532
nm
extends
near-infrared
region.
summary,
2D
was
applying
opened
up
potential
way
design
with
improved
Язык: Английский
Pressure Effects on the Optoelectronic Property of Nanocrystalline Anatase with Different Sizes
The Journal of Physical Chemistry C,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 19, 2024
In
this
study,
we
investigated
the
photoelectric
properties
of
nanosized
anatase
(∼55
and
∼4
nm)
under
high
pressure,
utilizing
in
situ
Raman
spectroscopy,
photocurrent
measurements,
theoretical
calculations
up
to
27.6(5)
GPa.
Our
findings
reveal
that
55
nm
shows
a
significant
increase
2.4
times
compared
ambient
conditions
before
transitioning
columbite
phase
at
around
5.5(1)
After
transition,
gradually
decreased
19.8(4)
Notably,
exhibited
superior
optoelectronic
performance
baddeleyite
observed
approximately
15.5(3)
For
anatase,
an
exceptional
131
was
5.4(1)
GPa
1.5(0)
GPa,
with
only
slight
decrease
between
maintained
level
even
after
pressure
release.
The
variations
are
attributed
changes
resistance,
band
gap,
absorption
coefficient,
each
influencing
material's
response
differently
across
various
ranges.
These
results
underscore
potential
pressure-induced
modulation
dramatically
enhance
especially
anatase.
ability
control
crystal
structure
UV
light
through
offers
promising
strategy
for
improving
TiO2-based
ultraviolet
photodetectors,
making
them
more
effective
advanced
applications.
Язык: Английский