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

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 expl...

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Bibliographic Details
Published in:Nanoscale 2018-02, Vol.10 (7), p.3451-3459
Main Authors: Deka Boruah, Buddha, Naidu Majji, Shanmukh, Nandi, Sukanta, Misra, Abha
Format: Article
Language:English
Subjects:
Bromine
Charge density
Chlorine
Current carriers
Doping
Fluorine
Iodine
Nanorods
Photometers
Photovoltaic cells
Quantum efficiency
Semiconductor materials
Zinc oxide
Zinc oxides
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Summary: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 , as compared to 0.3 mW cm , 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.
ISSN:2040-3364
2040-3372
DOI:10.1039/c7nr08125a