MoS<sub>2</sub> Quantum Dots Based MSM Deep UV Photodetector
Prashant Kumar Gupta, Amritanshu Pandey
Abstract
This letter reports facile hydrothermally synthesized colloidal MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> quantum dots (QDs) based inexpensive solution processed metal-semiconductor-metal (MSM) photodetector (PD) with device structure Au/MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> QDs/Au on Si/SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> 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 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times 10^{\mathbf {11}}$ </tex-math></inline-formula> 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).