High-Performance Ag NPs/MoS₂ QDs/SWCNTs/Si Near-Infrared Photodetector

Abstract

This article presents a Ag nanoparticles (NPs)/MoS2 quantum dots (QDs)/single-walled carbon nanotubes (SWCNTs)/Si photodetector operating in the near-infrared (NIR) region. The QDs and metal NPs are combined on the prepared photodetector to improve the performance through the optical absorption enhancement of QDs and the local surface plasmon resonance effect of metal NPs. Meanwhile, the speed of the device is improved by the high mobility of SWCNTs. At −1 V, the responsivity of the photodetector is 454.7 mA/W for the 808-nm laser and 347.5 mA/W for the 1064-nm laser. The detectivity of this photograph detector reaches $2.75\times 10^{{11}}$ Jones at 808 nm and $2.12\times 10^{{11}}$ Jones at 1064 nm. It also has a good response time under high-frequency illumination, with a rise time of $2.5~\mu $ s and a fall time of $62~\mu $ s. Such Ag NPs/MoS2 QDs/SWCNTs/Si heterostructured photodetectors have high performance and can be widely used for NIR photodetection.