Biodegradable Filter Paper Based Broad-Band Photodetection by Chemical Bath Deposited SnS<sub>2</sub> 2D-Nanosheet Array Film
Ayon Das Mahapatra, Durga Basak
Abstract
We breathe in a world where growing electronic wastages are a serious threat to our ecosystem, and therefore biodegradable devices are more in demand. We have unprecedentedly demonstrated broad-band low-intensity photodetection by SnS2 two-dimensional (2D) nanosheet (NS) array film grown on Whatman filter paper based biodegradable substrate. Phase pure SnS2 2D NS array film has been obtained using a low-cost facile chemical bath deposition technique as confirmed by X-ray diffractometry, X-ray photoelectron spectroscopy, and field emission scanning electron microscopy. Unprecedentedly, these biodegradable substrates based SnS2 NS array films can detect lights of wavelengths of 400 and 500 nm with photoresponsivity values of 6.31 and 10.22 mA/W, respectively. Uniquely, the SnS2 NS array film also detects very low-intensity lights of 43 μW/cm2 (400 nm) and 42 μW/cm2 (500 nm) with photoresponsivity values of 15.87 and 20.24 mA/W with detectivity values of 3.04 × 1010 and 3.88 × 1010 jones, respectively. Very stable broad-band photoresponse under successive illumination conditions has also been demonstrated. Collated experimental data support a photoresponse mechanism involving defect levels. This filter paper based photoactive SnS2 2D-NS array film can be applied to fabricate biodegradable low-intensity broad-band photodetector devices.