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Atomic disordering processes in crystalline GeTe induced by ion irradiation
- Source :
- Journal of Physics D: Applied Physics. 51:495103
- Publication Year :
- 2018
- Publisher :
- IOP Publishing, 2018.
-
Abstract
- The damaging process of GeTe up to amorphization has been studied by introducing controlled levels of disorder by irradiation with 150 keV Ar+ ions. In situ reflectivity measurements and ex-situ resistance and Raman spectroscopy analysis have been employed to study the impact of ion bombardment on the electrical conduction properties and on the bonding. The results obtained are indicative for three different stages of film damage. The first step appears to be dominated by point defects, affecting the temperature coefficient of resistance (TCR) and inducing a transition from positive (metallic conduction) to negative TCR values (conduction dominated by localized states), whilst the material still remains crystalline. The second step is characterized by the annealing of the defects induced, presumably, by the formation of complex defects that act as sinks for point defect recombination. This process is facilitated by the high atomic mobility. The third phase of damage starts at a fluence of 3.5 × 1014 cm−2 and finally converts the material to the amorphous state, characterized by higher resistance and decreased optical reflectivity. The modifications observed upon ion irradiation provide important insights into the possible states that can be achieved in crystalline GeTe through different local atomic arrangements towards amorphization.
- Subjects :
- Electron mobility
Materials science
Acoustics and Ultrasonics
Annealing (metallurgy)
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Crystallographic defect
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Ion
Amorphous solid
symbols.namesake
Chemical physics
0103 physical sciences
symbols
Irradiation
010306 general physics
0210 nano-technology
Spectroscopy
Raman spectroscopy
Subjects
Details
- ISSN :
- 13616463 and 00223727
- Volume :
- 51
- Database :
- OpenAIRE
- Journal :
- Journal of Physics D: Applied Physics
- Accession number :
- edsair.doi...........d1fbc6ff47b4c01a87731f2eb23f263f