Role of local structure in the phase change of Ge-Te films

被引：14

作者：

Choi, Yong Gyu ^{[1
]}

Kovalskiy, Andriy ^{[2
,3
]}

Cheong, Byung-Ki ^{[4
]}

Jain, Himanshu ^{[2
]}

机构：

[1] Korea Aerosp Univ, Dept Mat Sci & Engn, Gyeonggi 412791, South Korea

[2] Lehigh Univ, Dept Mat Sci & Engn, Bethlehem, PA 18015 USA

[3] Austin Peay State Univ, Dept Phys & Astron, Clarksville, TN 37044 USA

[4] Korea Inst Sci & Technol, Elect Mat Res Ctr, Seoul 136791, South Korea

来源：

CHEMICAL PHYSICS LETTERS | 2012年 / 534卷

基金：

美国国家科学基金会;

关键词：

DATA-STORAGE; ORDER;

D O I：

10.1016/j.cplett.2012.03.032

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 similar to 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. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：58 / 61

页数：4

共 24 条

[1] Structure of liquid phase change material AgInSbTe from density functional/molecular dynamics simulations [J].