Role of local structure in the phase change of Ge-Te films
- Role of local structure in the phase change of Ge-Te films
- 최용규; Andriy Kovalskiy; 정병기; Himanshu Jain
- local structure; phase change; GeTe
- Issue Date
- Chemical physics letters
- VOL 534, 58-61
- The role of structure in the crystallization of GexTe100-x model system suitable for phase-change applications
is established by determining the local environment of each constituent using EXAFS analysis.
Across the compositional spectrum, both constituents satisfy the (8-N) rule in the amorphous state
except that the Ge atoms are surrounded by ~3.4 neighbors in the stoichiometric composition. The estimation
of homopolar Ge–Ge and Te–Te bonds indicates that chemical order is preserved less for Ge than
for Te atoms. The crystallized stoichiometric film consists of Ge clusters in addition to GeTe crystals,
implying that the latter has appreciable concentration of Ge vacancies.
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