Investigation of the oxidation process in GeTe-based phase change alloy using Ge K-edge XANES spectroscopy

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F19%3A39914841" target="_blank" >RIV/00216275:25310/19:39914841 - isvavai.cz</a>
Result on the web
<a href="https://www.degruyter.com/view/j/pac.2019.91.issue-11/pac-2018-1229/pac-2018-1229.xml" target="_blank" >https://www.degruyter.com/view/j/pac.2019.91.issue-11/pac-2018-1229/pac-2018-1229.xml</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1515/pac-2018-1229" target="_blank" >10.1515/pac-2018-1229</a>

Result language
angličtina
Original language name
Investigation of the oxidation process in GeTe-based phase change alloy using Ge K-edge XANES spectroscopy
Original language description
In this work, we clearly demonstrate the efficacy of using XANES spectroscopy in conjunction with a Pilatus detector as a sensitive tool to allow the study of the oxidation process in GeTe alloys via depth profile analysis. On the basis of Ge K-edge XANES spectra, it was found that GeTe alloys do not oxidize readily after an initial native surface oxidation that occurs upon exposure to oxygen in the air at the elevated temperatures, 100 degrees C and 330 degrees C. We demonstrate that amorphous GeTe possesses a higher predisposition to oxidation than crystalline GeTe when exposed to the air at temperature of 100 degrees C. When the temperature is set to 330 degrees C in an air ambient, we show that the amorphous to crystal phase transition affects the oxidation process more significantly than the simple annealing of crystalline GeTe. We suggest that the higher tendency of GeTe films to oxidize during the phase transition is a consequence of the breaking of Ge-Ge bonds in the presence of oxygen atoms which subsequently leads to the extra formation of Ge-O bonds during crystallization.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10402 - Inorganic and nuclear chemistry

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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