THESIS
2019
xiv, 61 pages : illustrations ; 30 cm
Abstract
Infrared (IR) photodetection based on two-dimensional (2D) materials has attracted increasing
attention. However, the ultrathin property and indirect bandgap in few-layer structures
significantly degrade the IR photodetection performance. In this work, based on few-layer
MoTe2 that with a proper bandgap at IR regime, we have demonstrated a remarkable IR
photodetection response enhancement with a ~ 60 times by introducing a novel gold hollow
nanorods (AuHNRs) on the surface. The localized surface plasmon resonance (LSPR) induced
by metal nanoparticles is an effective strategy to enhance light absorption. This AuHNRs has a
strong plasmon band located at the IR regime, breaking the limitation of resonance range at
visible. Both the steady and transient optical spectra give evidence...[
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Infrared (IR) photodetection based on two-dimensional (2D) materials has attracted increasing
attention. However, the ultrathin property and indirect bandgap in few-layer structures
significantly degrade the IR photodetection performance. In this work, based on few-layer
MoTe2 that with a proper bandgap at IR regime, we have demonstrated a remarkable IR
photodetection response enhancement with a ~ 60 times by introducing a novel gold hollow
nanorods (AuHNRs) on the surface. The localized surface plasmon resonance (LSPR) induced
by metal nanoparticles is an effective strategy to enhance light absorption. This AuHNRs has a
strong plasmon band located at the IR regime, breaking the limitation of resonance range at
visible. Both the steady and transient optical spectra give evidence to confirm that the
enhancement of IR response concerning photon absorption correlates with the plasmon-induced
field enhancement, rather than hot charge transport between metal and semiconductor.
Therefore, this strategy can dispense with the strict restriction of interface quality and offers
significant advantages in large scale application compared to other methods.
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