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Enhanced Broadband Photoresponse of a Self-Powered Photodetector Based on Vertically Grown SnS layers via the Pyro-Phototronic Effect

Abstract

Here, we demonstrate the broadband photoresponse from ultraviolet (365 nm) to near-infrared (850 nm) wavelengths from a photodetector based on vertically grown SnS layers. Particularly, the photoinduced current density of the device enhanced from 100 to 470 μA cm-2 with 760 nm at 7 mW cm-2 by utilizing the pyro-phototronic potential. In addition, the photodetector demonstrated ultrafast response rates of ~12 μs for the rise and ~55 μs for the decay times over the studied range. Moreover, a good photoresponsivity of 13 mA W-1 and a high photodetectivity of 3×1014 Jones at a 760 nm wavelength with an intensity of 7 mW cm-2 were measured, representing enhancements of 340% and 3960%, respectively, with the pyroelectric potential. This excellent broadband performance was attributed to the photon-induced pyroelectric effect in the vertically grown SnS layers, which also modulated the optoelectronic processes. This novel approach will open a new avenue to design a broadband ultrafast device for advanced optoelectronics.

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Publication details

The article was received on 24 Sep 2017, accepted on 09 Nov 2017 and first published on 09 Nov 2017


Article type: Paper
DOI: 10.1039/C7NR07120E
Citation: Nanoscale, 2017, Accepted Manuscript
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    Enhanced Broadband Photoresponse of a Self-Powered Photodetector Based on Vertically Grown SnS layers via the Pyro-Phototronic Effect

    M. Kumar, M. Patel, J. Kim and D. Lim, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR07120E

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