MoS2 Quantum Dots Based MSM Deep UV Photodetector

This letter reports facile hydrothermally synthesized colloidal MoS
₂
quantum dots (QDs) based inexpensive solution processed metal-semiconductor-metal (MSM) photodetector (PD) with device structure Au/MoS
₂
QDs/Au on Si/SiO
₂
substrate to observe the ~275 nm deep UV radiation used in SARS-CoV-2 virus inactivation. The ligand exchange technique has been used thereby, reducing inter QDs distance for better film quality. Under deep UV exposure (275 nm), the fabricated MSM PD displays good responsivity (343.53 mA/W), external quantum efficiency (EQE) (154.9 %), and detectivity (2.51
$\times 10^{\mathbf {11}}$
Jones) values. The time response analysis under deep UV irradiation ~275 nm demonstrates adequate rise time (81.17 ms) and fall time (79.58 ms).