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Issue 7, 2018

Doping controlled pyro-phototronic effect in self-powered zinc oxide photodetector for enhancement of photoresponse

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Abstract

The pyro-phototronic effect can be used in pyroelectric semiconductor materials to significantly contribute in enhancing the self-powered photoresponse of photodetectors (PDs) via modulation of the photogenerated charge density. The pyro-phototronic effect in zinc oxide (ZnO) nanorods (NRs) was exploited thoroughly by doping with halogen elements, such as fluorine, chlorine (Cl), bromine and iodine. Cl-doped ZnO NRs (Cl : ZnO NRs) induces a large number of free charge carriers to enhance the self-powered photoresponse behavior (nearly 333% enhancement in response current) due to the pyro-phototronic effect as compared to pristine ZnO NRs. Moreover, 405% enhancement in pyrocurrent was measured for the Cl : ZnO NRs PD under a ultraviolet illumination intensity of 3 mW cm−2, as compared to 0.3 mW cm−2, in the absence of external bias voltage. Furthermore, other photoresponse parameters such as responsivity, external quantum efficiency and specific detectivity are measured to be higher due to the pyro-phototronic effect. Therefore, this study reveals the direct use of the pyro-phototronic effect to enhance the self-powered photoresponse.

Graphical abstract: Doping controlled pyro-phototronic effect in self-powered zinc oxide photodetector for enhancement of photoresponse

Supplementary files

Article information


Submitted
01 Nov 2017
Accepted
18 Jan 2018
First published
19 Jan 2018

Nanoscale, 2018,10, 3451-3459
Article type
Paper

Doping controlled pyro-phototronic effect in self-powered zinc oxide photodetector for enhancement of photoresponse

B. Deka Boruah, S. Naidu Majji, S. Nandi and A. Misra, Nanoscale, 2018, 10, 3451 DOI: 10.1039/C7NR08125A

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