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2D‐Layered MoS 2 ‐Incorporated TiO 2 ‐Nanofiber‐ Based Dye‐Sensitized Solar Cells
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Abstract
Atomically thin layers of molybdenum disulfide (MoS
2
) were examined to facilitate electron transport in titanium dioxide (TiO
2
) nanofiber network for dye sensitized solar cell (DSSC) applications. Raman active modes observed at 382 cm
−1
and 406 cm
−1
confirmed the presence of atomically thin MoS
2
in TiO
2
and transmission electron microscopic studies showed MoS
2
with a lattice spacing of 3.12 Å. DSSCs using MoS
2
incorporated TiO
2
nanofiber as a photo‐anode resulted in 27% enhancement in photo‐conversion efficiency (
η
) than that of the DSSC using only TiO
2
as an electron acceptor. A 26% enhancement in the short circuit current density (
J
SC
) achieved by incorporating 0.1 weight % of MoS
2
nanoflakes in the bulk of TiO
2
confirmed efficient electron transport achieved by suppressing the probability of electron‐hole capture by TiO
2
surface states due to the additional electron transport pathways established by MoS
2
which facilitated the photo‐generated electrons to reach the transparent electrode by skipping the TiO
2
surface states. Results suggest that further increase in the quantity of MoS
2
in TiO
2
impedes the electron transport in the bulk as observed with 7% and 38% reduction in
η
for 0.2 and 0.3 weight % of MoS
2
in TiO
2
. This suggests that the DSSC performance can be increased for an optimum concentration of MoS
2
in TiO
2
by establishing efficient transport pathways towards the transparent electrode.
Title: 2D‐Layered MoS
2
‐Incorporated TiO
2
‐Nanofiber‐ Based Dye‐Sensitized Solar Cells
Description:
Abstract
Atomically thin layers of molybdenum disulfide (MoS
2
) were examined to facilitate electron transport in titanium dioxide (TiO
2
) nanofiber network for dye sensitized solar cell (DSSC) applications.
Raman active modes observed at 382 cm
−1
and 406 cm
−1
confirmed the presence of atomically thin MoS
2
in TiO
2
and transmission electron microscopic studies showed MoS
2
with a lattice spacing of 3.
12 Å.
DSSCs using MoS
2
incorporated TiO
2
nanofiber as a photo‐anode resulted in 27% enhancement in photo‐conversion efficiency (
η
) than that of the DSSC using only TiO
2
as an electron acceptor.
A 26% enhancement in the short circuit current density (
J
SC
) achieved by incorporating 0.
1 weight % of MoS
2
nanoflakes in the bulk of TiO
2
confirmed efficient electron transport achieved by suppressing the probability of electron‐hole capture by TiO
2
surface states due to the additional electron transport pathways established by MoS
2
which facilitated the photo‐generated electrons to reach the transparent electrode by skipping the TiO
2
surface states.
Results suggest that further increase in the quantity of MoS
2
in TiO
2
impedes the electron transport in the bulk as observed with 7% and 38% reduction in
η
for 0.
2 and 0.
3 weight % of MoS
2
in TiO
2
.
This suggests that the DSSC performance can be increased for an optimum concentration of MoS
2
in TiO
2
by establishing efficient transport pathways towards the transparent electrode.
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