2014
DOI: 10.1139/cjp-2013-0498
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Defect states in amorphous Ge2Sb2Te5 phase change material

Abstract: Steady-state photoconductivity measurements in the temperature range 100-300 K on amorphous Ge 2 Sb 2 Te 5 thin film prepared by dc sputtering are analyzed. The dark conductivity is thermally activated with a single activation energy that allocates the position of the Fermi level approximately in the middle of the energy gap relative to the valance band edge. The temperature dependence of the photoconductivity ensures the presence of a maximum normally observed in chalcogenides with low-and high-temperature sl… Show more

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