2021
DOI: 10.3390/nano11071729
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Effect of Nitrogen Doping on the Crystallization Kinetics of Ge2Sb2Te5

Abstract: Among the phase change materials, Ge2Sb2Te5 (GST-225) is the most studied and is already integrated into many devices. N doping is known to significantly improve some key characteristics such as the thermal stability of materials and the resistance drift of devices. However, the origin, at the atomic scale, of these alterations is rather elusive. The most important issue is to understand how N doping affects the crystallization characteristics, mechanisms and kinetics, of GST-225. Here, we report the results o… Show more

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Cited by 17 publications
(15 citation statements)
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“…Then, they increase again for longer annealing time, probably as a result of the slight growth of the existing grains, again at the end of the phase separation process. It is important to note that these sizes are surprisingly large and well above any reported crystallite sizes observed during the nucleation-limited crystallization of pure GST-225. , …”
Section: Results and Determination Of The Crystallization Scenariosupporting
confidence: 61%
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“…Then, they increase again for longer annealing time, probably as a result of the slight growth of the existing grains, again at the end of the phase separation process. It is important to note that these sizes are surprisingly large and well above any reported crystallite sizes observed during the nucleation-limited crystallization of pure GST-225. , …”
Section: Results and Determination Of The Crystallization Scenariosupporting
confidence: 61%
“…It is important to note that these sizes are surprisingly large and well above any reported crystallite sizes observed during the nucleation-limited crystallization of pure GST-225. 30,31 To set up and validate a scenario able to explain all the observed characteristics of the crystallization of GGST alloys, several questions must be answered. First of all, why is Ge crystallization observed as such a low temperature?…”
Section: Results and Determination Of The Crystallization Scenariomentioning
confidence: 99%
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“…The stack was protected against oxidation by depositing in situ, immediately after fabrication, a 10 nm thick SiN capping layer. Annealing experiments were performed either in situ in a TEM, following a procedure minimizing experimental artefacts, as presented in detail by Luong et al 32 , or ex situ, in a conventional annealing furnace, under nitrogen flux. XRD measurements were carried out using a Bruker D8 Discover diffractometer with a Cu -Ka1 source (λ = 1.5406 Å).…”
Section: Experimental Challenge and Approachmentioning
confidence: 99%
“…In the past decade, many studies focus on the thermal stability of PCMs by introducing gas elements, such as oxygen and nitrogen. Especially, the oxygen-doped Sb-based alloys, such as O 2 -doped Ge-Sb-Te, Ge-Sb, , Sn-Sb, , Zn-Sb, and Si-Sb, have exhibited an improvement in thermal stabilities. However, the excess O 2 doping would bring the negative effects in the phase-change performance, such as the low phase-transition speed.…”
Section: Introductionmentioning
confidence: 99%