An Efficient White-Light Photodetector Based on 2D-SnS<sub>2</sub> Nanosheets
Sanjeev Mani Yadav, Amritanshu Pandey
Abstract
This article reports the fabrication and characterizations of a metal contact-free SnS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanosheets-based efficient white light photodetection structure patterned over a high conducting indium tin oxide (ITO) sheet. A new design aspect has been incorporated in this report to fabricate a photodetector by avoiding the realization of metal contacts pads. A low-cost and one-pot hydrothermal technique has been used to synthesize high crystalline SnS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanosheets. The maximum responsivity and EQE(%) of the fabricated detector for the small channel spacing ~ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$10 \mu \text{m}$ </tex-math></inline-formula> over a wavelength range 350–750 nm is found to be 8.82 A/W and 2084, respectively. The speed parameters of the fabricated structure were further investigated under white light illumination of power density <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$360 \mu \text{W}$ </tex-math></inline-formula> /cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . The proposed low-cost photodetector exhibits a reasonably fast light response with the rise and fall time of 1.2 and 3 s, respectively.