Interstitial Defects Induced Ferroelectricity in Undoped ZnO Nanorods at Room Temperature

Ghosh, Moumita and Rao, Mohan G (2013) Interstitial Defects Induced Ferroelectricity in Undoped ZnO Nanorods at Room Temperature. In: SCIENCE OF ADVANCED MATERIALS, 5 (7). pp. 733-739.

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Abstract

A simple approach for obtaining room temperature ferroelectricity in ZnO rod structures at the nanoscale is reported. A systematic comparative study between two kinds of nanorods prepared by different processes reveals the physics behind it. It is observed that ZnO nanorods grown (in-situ) by a sol gel method on platinum substrate show ferroelectric behaviour. On the contrary, ZnO nanorods first grown by a sol gel method and then spin-coated on a platinum substrate (ex-situ) do not demonstrate this kind of feature. X-ray diffraction analysis confirms partially (002) and (100) plane oriented growth of both samples. From photoluminescence (PL) spectral analysis it is interpreted that oxygen vacancies/zinc interstitial defects, which arises from the large lattice mismatch between the Pt substrate and the ZnO nanorods grown thereon, and preferential ZnO growth along 002], can be causes of this type of phenomena. C-V characterization, P-E hysteresis loop along with piezoelectric force microscopy support this observation.

Item Type:	Journal Article
Publication:	SCIENCE OF ADVANCED MATERIALS
Publisher:	AMER SCIENTIFIC PUBLISHERS
Additional Information:	Copyright for this article belongs to AMER SCIENTIFIC PUBLISHERS,USA.
Keywords:	Ferroelectricity; ZnO; Nanorod; Lattice Mismatch; Scanning Electron Microscopy; X-Ray Diffraction; Piezoresponse Force Microscopy
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	24 Sep 2013 10:40
Last Modified:	06 Feb 2014 08:40
URI:	http://eprints.iisc.ac.in/id/eprint/47312

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