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The influence of network rigidity on the electrical switching behaviour of Ge–Te–Si glasses suitable for phase change memory applications

Anbarasu, M and Asokan, S (2007) The influence of network rigidity on the electrical switching behaviour of Ge–Te–Si glasses suitable for phase change memory applications. In: Journal of Physics D: Applied Physics, 40 (23). pp. 7515-7518.

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Abstract

$Ge_{15}Te_{85-x}Si_x (2 \leq x \leq 12)$ glasses of a wide range of compositions have been found to exhibit electrical switching at threshold voltages in the range 100–600V, for a sample thickness of 0.3 mm. The samples become latched to the ON state (memory behaviour) at higher ON state currents (>1 mA).However, the switching is found to be reversible (threshold behaviour) if the ON state current is limited to lower values ( \leq 0.7 mA). While $Ge_{15}Te_{85-x}Si_x$ glasses with x \leq 5 exhibit a normal electrical switching, an unstable behaviour is seen in the I–V characteristics of $Ge_{15}Te_{85-x}Si_x$ glasses with x > 5 during the transition to the ON state. Further, a sparking in the electrode region and the splashing of the active material is observed in $Ge_{15}Te_{85-x}Si_x$ glasses with x > 5. It is also interesting to note that the switching voltage $(V_T)$ and initial resistance (R) of $Ge_{15}Te_{85-x}Si_x$ glasses increase with addition of Si, exhibiting a change in slope at a composition x = 5 ( \langle r \rangle = 2.4). The observed electrical switching behaviour of $Ge_{15}Te_{85-x}Si_x$ glasses has been understood on the basis that the composition x = 5 is the rigidity percolation threshold of the $Ge_{15}Te_{85-x}Si_x$ system. It is also proposed that the $Ge_{15}Te_{85-x}Si_x$ glasses with x < 5 are likely to be more suitable for phase change memory applications.

Item Type: Journal Article Copyright of this article belongs to Institute of Physics and IOP. Division of Physical & Mathematical Sciences > Instrumentation and Applied Physics (Formally ISU) 13 Feb 2008 19 Sep 2010 04:42 http://eprints.iisc.ernet.in/id/eprint/13015