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ZnO/Poly(3,4-ethylenedioxythiophene) Poly(styrenesulfonate) Based Ultraviolet and Visible Photodetectors: Role of Defects

Shetty, Amitha and Nanda, Karuna Kar (2012) ZnO/Poly(3,4-ethylenedioxythiophene) Poly(styrenesulfonate) Based Ultraviolet and Visible Photodetectors: Role of Defects. In: MATERIALS EXPRESS, 2 (3). pp. 251-256.

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Official URL: http://dx.doi.org/10.1166/mex.2012.1071

Abstract

Here, we report the ZnO/poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) based photodetectors that can response to ultraviolet as well as visible light. The temporal response of the heterostructures for various excitations in the ultraviolet (UV) and visible range are performed. The time constants are found to be excitation-dependent, the response to visible light is better as compared to UV. The reason behind the better response to UV light is the high level of defects present in ZnO as confirmed by the photoluminescence (PL) measurements. This is corroborated by the time resolved fluorescence (TRF) measurements which provides sufficient information behind the slow response time under the UV excitations. The possible explanation being the non-radiative recombinations occurring due to the traps or impurities present in the film which slows down the photoresponse.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to AMER SCIENTIFIC PUBLISHERS, USA
Keywords: UV and Visible Photodetectors;Defect;Time Resolved Fluorescence;Non-Radiative Recombination
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Francis Jayakanth
Date Deposited: 31 Dec 2012 07:21
Last Modified: 31 Dec 2012 07:21
URI: http://eprints.iisc.ac.in/id/eprint/45603

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