Mechanism of Nonvolatile Resistive Switching in ZnO/alpha-Fe2O3 Core-Shell Heterojunction Nanorod Arrays

Sarkar, Debasish and Singh, Ashutosh K (2017) Mechanism of Nonvolatile Resistive Switching in ZnO/alpha-Fe2O3 Core-Shell Heterojunction Nanorod Arrays. In: JOURNAL OF PHYSICAL CHEMISTRY C, 121 (23). pp. 12953-12958.

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Abstract

Nonvolatile resistive switching based (RRAM) is evolving rapidly among various other,nanoscaled-semiconductor technologies. In this article, resistive switching mechanism in a solution-route-processed ZnO/alpha-Fe2O3 core-shell n-n heterojunction nanorods (NRs) is investigated for the first time. As fabricated nanostructured,electrode shows resistive switching with compelling ON/OFF ratio at a significantly. small reverse bias voltage (-0.55 V). Moreover, this Core-shell nanorod-based resistive-switch exhibits an excellent time-retention (with relaxation constant (alpha) similar to -0.0065 even after similar to 10(3) s) and endurance (with a minute change in switching potential after 100 switching Cycles). Resistive switching in this core-shell nanorods system arises due to the tuning of band-alignment at the heterojunction interface governed by fast and reversible migration of charge/ionic species on either side of the interface under reverse-bias condition, facilitating electron tunneling across the interface as supported by experimental observations, together with highly nonlinear dependency of the drift Velocities of oxygen-vacancies on applied potential bias. Such understanding behind the, high-degree and energy-efficient nonvolatile resistive switching in ZnO/alpha-Fe2O3 core-shell NRs make them a potential candidate in engineering next-generation nanoheterostructure based RRAM devices.

Item Type:	Journal Article
Publication:	JOURNAL OF PHYSICAL CHEMISTRY C
Additional Information:	Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	14 Jul 2017 10:21
Last Modified:	14 Jul 2017 10:21
URI:	http://eprints.iisc.ac.in/id/eprint/57383

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