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Memory type switching behavior of ternary Ge20Te80-xSnx (0 <= x <= 4) chalcogenide compounds

Fernandes, Brian Jeevan and Sridharan, Kishore and Munga, Pumlian and Ramesh, K and Udayashankar, NK (2016) Memory type switching behavior of ternary Ge20Te80-xSnx (0 <= x <= 4) chalcogenide compounds. In: JOURNAL OF PHYSICS D-APPLIED PHYSICS, 49 (29).

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Official URL: http://dx.doi.org/10.1088/0022-3727/49/29/295104

Abstract

Chalcogenide compounds have gained huge research interest recently owing to their capability to transform from an amorphous to a crystalline phase with varying electrical properties. Such materials can be applied in building a new class of memories, such as phase-change memory and programmable metallization cells. Here we report the memory type electrical switching behavior of a ternary chalcogenide compound synthesized by doping Tin (Sn) in a germanium-telluride (Ge20Te80) host matrix, which yielded a composition of Ge20Te80-xSnx (0 <= x <= 4). Results indicate a remarkable decrease in the threshold switching voltage (V-T) from 140 to 61 V when the Sn concentration was increased stepwise, which is attributed to the domination of the metallicity factor leading to reduced amorphous network connectivity and rigidity. Variation in the threshold switching voltage (VT) was noticed even when the sample thickness and temperature were altered, confirming that the memory switching process is of thermal origin. Investigations using x-ray diffraction (XRD) and scanning electron microscopy (SEM) revealed the formation of a crystalline channel that acts as the conduction path between the two electrodes in the switched region. Structural and morphological studies indicated that Sn metal remained as a micro inclusion in the matrix and hardly contributed to the rigid amorphous network formation in Ge20Te80-xSnx. Memory type electrical switching observed in these ternary chalcogenide compounds synthesized herein can be explored further for the fabrication of phase-change memory devices.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 03 Dec 2016 05:16
Last Modified: 03 Dec 2016 05:16
URI: http://eprints.iisc.ac.in/id/eprint/55235

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