The Journal of Chemical Physics,
Journal Year:
2024,
Volume and Issue:
160(16)
Published: April 24, 2024
A
large
open-circuit
voltage
(VOC)
deficit
is
the
major
challenge
hindering
efficiency
improvement
of
Cu2ZnSn(S,Se)4
(CZTSSe)
solar
cells.
Cation
substitution,
or
doping,
usually
an
effective
strategy
to
achieve
carrier
regulation
and
improve
efficiency.
In
this
work,
we
developed
a
rare-earth
element
lanthanum
(La)
doped
CZTSSe
thin-film
cell
by
directly
introducing
La3+
ions
into
CZTS
precursor
solution.
Such
proposed
La
doping
approach
could
effectively
enhance
light
harvesting,
adjust
bandgap,
increase
electron
diffusion
length.
Furthermore,
appropriate
concentrations
can
reduce
harmful
defect
cluster.
Benefiting
from
VOC
significantly
increases
431
497
mV.
Consequently,
power
conversion
enhanced
6.54%
(VOC
=
mV,
JSC
25.50
mA/cm2,
FF
58.28%)
for
reference
10.21%
35.20
58.41%)
optimized
La-doped
cell.
This
research
provides
new
direction
enhancing
performance
cells,
offering
promising
prospects
future
