Current-voltage curves of eutectic In-Sb-Te thin films for phase change memory devices

Abstract

Purpose: The purpose of this paper is to investigate electrical properties of eutectic In8Sb8Te84 and In10Sb51Te39 as made thin films to evaluate their potential for non-volatile phase-change memories, once the thermal measurements are very optimistic. Design/methodology/approach: The films were deposited by pulse laser deposition technique. By using a very simple home-made cell, transversal current-voltage curves films were measured involving both voltage controlled-pulses generator and current controlled-pulses generator, employing different pulse shapes: triangular and sine shaped. Findings: The memory effect, characteristic of a typical phase-change memory material, was observed in both materials under research. For higher tellurium content in the film, lower is the value of threshold voltage. Research limitations/implications: Further studies on endurance, scaling and SET/RESET operations are needed. Practical implications: The values of the key parameters, threshold voltage and hold voltage are comparable with those of Ge2Sb2Te5, GeTe and Sb2Te being considered to date as the main compounds for PCM devices. Originality/value: The conduction mechanism in the amorphous regime is agreed with Poole–Frenkel effect in deep traps.