Hybrid 2D–0D SnS2 Nanoflakes/CTS QDs-Based Broadband (UV-Visible-NIR) Photodetector

Abstract

This article reports the SnS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanoflakes/(Cu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> SnS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ) CTS Qds-based hybrid ultrawideband photodetector (PD). The fabricated device detects the illumination in the 300-1100-nm spectrum (UV-Vis-NIR). The synergetic effect of UV detection characteristics of SnS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanoflakes and NIR detection characteristics of CTS Qds is utilized to obtain ultrawideband detection in the UV to NIR region. Low cost and simple solvothermal technique has been used to synthesize good quality of 2D SnS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanoflakes (size ~ 146 nm) and 0D CTS Qds (size, ~ 3.2 nm). In addition to being an active semiconductor for UV light, the SnS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanoflakes layer in the device has an additional task of being a carrier transport layer for the photogenerated carriers in CTS Qds. This 2D/0D (SnS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanoflakes/CTS Qds) PD structure fabricated on a silicon substrate has shown excellent performance in the entire range, that is, UV-Vis-NIR. The sensitivity of the fabricated CTS Qds/SnS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanoflake-based PD was found to be 296.2, 240.7, and 368.05 for illumination wavelengths of 320, 640, and 970 nm, respectively. The reported CTS Qds/SnS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanoflake-based 2D-0D hybrid detector has a responsivity of 53.88, 5.16, and 12.61 A/W for 320, 640, and 970-nm light wavelengths, respectively, and best detectivity has been observed in the order of 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">13</sup> Jones for UV light.