2D-SnS$_2$ Nanoflakes Based Efficient Ultraviolet Photodetector

Abstract

This paper reports a SnS $_2$ nanoflakes based UV photodetector having high sensitivity and thermal stability upto 120 $^{\circ}$ C. Simple and low cost solvothermal technique has been used to synthesize SnS $_2$ nanoflakes of close to hexagonal shapes. A simple photoconductor structure on SiO $_{2}$ /Si substrate is fabricated by using Ag as contact material. The resultant device has good sensitivity ( $\sim$ 400), responsivity ( $\sim$ 5.5 A/W), EQE ( $\sim$ 1868%), detectivity ( ${\sim} \text{1.72}\times \text{10}^{13}$ Jones) and low response time ( $\sim$ 2.2 s). The reported characteristics are superior to many other UV photodetectors utilizing complex hybrid structure of the device, either in form of additional filter layer or nanostructural light sensitive material.