Two-dimensional (2D) molybdenum disulfide (MoS 2 ) has emerged as a prospective candidate for photodetection. However, due to the surface defects formed during the synthesis, the low photoresponse of 2D MoS 2 photodetectors restricts its practical applications. Here, we developed a hybrid plasmonic structure that integrates MXene nanoparticles (MNPs) and 2D MoS 2 . With the introduction of MNPs, light waves are concentrated on MoS 2 nanosheets via a strong localized surface plasmon resonance. Consequently, MNPs-decorated MoS 2 photodetectors exhibit an improved photoresponse, including a higher responsivity (20.67 A/W), a larger detectivity of 5.39 × 10 12 Jones, and a maximum external quantum efficiency of over 5000%. A 150-fold enhanced detectivity (2.33 × 10 12 Jones) was achieved under 635 nm light illumination in the optimized device. These results provide an alternative approach for improving the photoresponse of MoS 2 photodetectors.
Narrow-band-gap III–V
semiconductor nanowires (NWs) with
a suitable band structure and strong light-trapping ability are ideal
for high-efficiency low-cost solar water-splitting systems. However,
due to their nanoscale dimension, they suffer more severe corrosion
by the electrolyte solution than the thin-film counterparts. Thus,
short-term durability is the major obstacle for using these NWs for
practical water-splitting applications. Here, we demonstrated for
the first time that a thin layer (∼7 nm thick) of compact TiO
2
deposited by atomic layer deposition can provide robust protection
to III–V NWs. The protected GaAs NWs maintain 91.4% of its
photoluminescence intensity after 14 months of storage in ambient
atmosphere, which suggests the TiO
2
layer is pinhole-free.
Working as a photocathode for water splitting, they exhibited a 45%
larger photocurrent density compared with unprotected counterparts
and a high Faraday efficiency of 91% and can also maintain a record-long
highly stable performance among narrow-band-gap III–V NW photoelectrodes;
after 67 h photoelectrochemical stability test reaction in a strong
acid electrolyte solution (pH = 1), they show no apparent indication
of corrosion, which is in stark contrast to the unprotected NWs that
fully failed after 35 h. These findings provide an effective way to
enhance both stability and performance of III–V NW-based photoelectrodes,
which are highly important for practical applications in solar-energy-based
water-splitting systems.
3D Au nanostructure/anodic aluminum oxide (AAO) matrix plasmonic architectures with strong plasmonic coupling for spatial light utilization are reported.
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