physica status solidi (RRL) - Rapid Research Letters,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 17, 2024
When
stacked
into
heterostructures,
layered
transition
metal
dichalcogenides
(TMDCs)
exhibit
peculiar
electronic
and
optical
properties
that
may
differ
substantially
from
those
of
their
constituents
largely
depend
on
the
level
alignment.
For
example,
MoTe
2
/WSe
heterobilayer
exhibits
a
type
I
band
lineup,
which
can
be
exploited
in
emitting
devices
but
limits
charge
separation.
In
this
first‐principle
study
based
density
functional
theory
many‐body
perturbation
theory,
strain
is
proposed
as
an
effective
means
to
make
II
heterostructure.
By
exploring
several
configurations
where
biaxial
applied
either
or
both
monolayers,
top
valence
bottom
conduction
are
found
at
different
points
k‐space
leading
indirect‐to‐direct
bandgap
when
lattice
constant
WSe
expanded
by
3.2%
more.
terms
properties,
all
considered
systems
first
dark
excitation,
consistently
shifting
energy
with
direct
gap,
while
absorption
onset
does
not
vary
significantly
strain.
Our
findings
suggest
powerful
tool
for
fine
tuning
TMDC
heterostructures
preserving
fundamental
characteristics,
thus
opening
new
avenues
designing
optoelectronic
applications.
The Journal of Chemical Physics,
Год журнала:
2024,
Номер
160(20)
Опубликована: Май 28, 2024
Van
der
Waals
heterostructures
(vdWHs)
of
vertically
stacked
two-dimensional
(2D)
atomic
crystals
have
been
used
to
elicit
intriguing
phenomena
stemming
from
strong
electronic
correlations,
magnetic
textures,
and
interlayer
excitons
spawned
at
the
heterointerface.
However,
vdWHs
comprised
heterointerfaces
between
these
2D
crystal
lattices
molecular
assemblies
are
emerging
as
equally
platforms
supporting
properties
be
harnessed
for
photovoltaic
energy
conversion,
photodetection,
spin-selective
charge
injection,
quantum
emission.
In
this
perspective,
we
summarize
recent
research
examining
exciton
dynamics
in
semiconducting
transition
metal
dichalcogenides
organic
semiconductors.
We
discuss
methods
assembly
heterostructures,
nature
or
charge-transfer
transition-metal
dichalcogenide
(TMD)-molecule
interfaces,
explicit
transfer
organics
TMDs,
other
interfacial
driven
by
merger
two
material
classes.
also
suggest
key
new
directions
extending
remit
atomic–molecular
lattice
into
domains
condensed
matter
physics,
sensing,
conversion.
Unique
optoelectronic
properties
of
monolayer
transition
metal
dichalcogenides
(TMDs)
originate
from
strong
quantum
confinement
effects
and
reduced
dielectric
screening.
However,
their
low
dimensionality
also
renders
photoinduced
dynamics
the
resulting
highly
susceptible
to
defects.
Yet,
mechanistic
relationship
between
intrinsic
defects
non-uniform
responses
has
remained
elusive,
calling
for
spatially
resolved
characterization
visualize
heterogeneous
dynamics.
Here,
we
apply
ultrafast
infrared
scattering
scanning
near-field
optical
microscopy
(ultrafast
IR
s-SNOM)
investigate
WS2
monolayers
grown
by
chemical
vapor
deposition.
We
demonstrate
that
s-SNOM,
with
relatively
high
excitation
fluence,
sensitively
probes
electron–hole
plasma
induced
in
local
domains
individual
monolayers.
The
transient
mid-infrared
response
is
enhanced
extended
lifetimes
near
edges,
indicating
mitigation
many-body
interactions.
propose
modulated
associated
defect-mediated
mechanisms,
providing
implications
engineering
TMD-based
nanoscale
optoelectronics.
ACS Nano,
Год журнала:
2024,
Номер
18(47), С. 32973 - 32983
Опубликована: Ноя. 14, 2024
Two-dimensional
semiconductors
exhibit
pronounced
many-body
effects
and
intense
optical
responses
due
to
strong
Coulombic
interactions.
Consequently,
subtle
differences
in
photoexcitation
conditions
can
strongly
influence
how
the
material
dissipates
energy
during
thermalization.
Here,
using
multiple
excitation
spectroscopies,
we
show
that
a
distinct
thermalization
pathway
emerges
at
elevated
energies,
enhancing
formation
of
trions
charged
biexcitons
single-layer
WSe
physica status solidi (RRL) - Rapid Research Letters,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 17, 2024
When
stacked
into
heterostructures,
layered
transition
metal
dichalcogenides
(TMDCs)
exhibit
peculiar
electronic
and
optical
properties
that
may
differ
substantially
from
those
of
their
constituents
largely
depend
on
the
level
alignment.
For
example,
MoTe
2
/WSe
heterobilayer
exhibits
a
type
I
band
lineup,
which
can
be
exploited
in
emitting
devices
but
limits
charge
separation.
In
this
first‐principle
study
based
density
functional
theory
many‐body
perturbation
theory,
strain
is
proposed
as
an
effective
means
to
make
II
heterostructure.
By
exploring
several
configurations
where
biaxial
applied
either
or
both
monolayers,
top
valence
bottom
conduction
are
found
at
different
points
k‐space
leading
indirect‐to‐direct
bandgap
when
lattice
constant
WSe
expanded
by
3.2%
more.
terms
properties,
all
considered
systems
first
dark
excitation,
consistently
shifting
energy
with
direct
gap,
while
absorption
onset
does
not
vary
significantly
strain.
Our
findings
suggest
powerful
tool
for
fine
tuning
TMDC
heterostructures
preserving
fundamental
characteristics,
thus
opening
new
avenues
designing
optoelectronic
applications.
