Cohesive and adhesive properties of ultrathin amorphous and crystalline Ge2Sb2Te5 films on polyimide substrates

被引：23

作者：

Schlich, Franziska F. ^{[1
]}

Wyss, Andreas ^{[1
]}

Galinski, Henning ^{[1
]}

Spolenak, Ralph ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Dept Mat, Lab Nanomet, Vladimir Prelog Weg 5, CH-8093 Zurich, Switzerland

来源：

ACTA MATERIALIA | 2017年 / 126卷

关键词：

Optical spectroscopy; Mechanical behavior; Thin films; Phase transformation; PHASE-CHANGE MATERIALS; REFLECTANCE DIFFERENCE SPECTROSCOPY; THIN-FILM; IN-SITU; ANISOTROPY SPECTROSCOPY; MECHANICAL STRESSES; FRAGMENTATION; COATINGS; TENSION; GROWTH;

D O I：

10.1016/j.actamat.2016.12.060

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, the onset strains of fragmentation, the fracture strength, and fracture toughness of amorphous and crystalline Ge2Sb2Te5 (GST) films are determined. Using in situ methods, such as resistance measurements, reflectance anisotropy spectroscopy (RAS), and light microscopy during uniaxial tensile loading, we demonstrate that onset strain of fragmentation and delamination depend on both, crystallographic state of the GST film and the film thickness. We observe that amorphous GST fractures at larger strains than crystalline GST. However, due to its small Young's modulus the fracture toughness K-IC of amorphous GST is lower than that of crystalline GST (amorphous: K-IC = 0.4 +/- 0.2 MPa ma(0.5); crystalline: K-IC = 0.8 +/- 0.2 MPa ma(0.5)). The results presented are critically discussed with respect to the potential application of GST films in flexible displays. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：264 / 271

页数：8

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