Journal ArticleDOI
Investigating the Influence of Resonant Bonding on the Optical Properties of Phase Change Materials (GeTe)xSnSb2Se4
Christine Koch,Gerrit Schienke,Melf Paulsen,Dominik Meyer,Martin Wimmer,Hanno Volker,Matthias Wuttig,Wolfgang Bensch +7 more
TLDR
In this paper, the van der Pauw method was used to investigate the electrical contrast between the amorphous and metastable crystalline state of GeTe and SnSb2Se4, up to a 4.5:1 GeTe:SnSb 2Se4 ratio.Abstract:
Thin film samples of Ge9SnSb2Te9Se4, Ge4.5SnSb2Te4.5Se4, Ge2.5SnSb2Te2.5Se4, and GeSnSb2TeSe4 were prepared via co-sputtering of GeTe and SnSb2Se4 and compared to the well-investigated phase change material GeTe. All samples were obtained in an amorphous state. Temperature-dependent in situ X-ray diffraction experiments reveal a crystallization temperature that increases with an increasing SnSb2Se4 content, leading to a higher stability of the amorphous phase. The electrical contrast between the amorphous and metastable crystalline state investigated via the van der Pauw method is as large as 4 orders of magnitude up to a 4.5:1 GeTe:SnSb2Se4 ratio. Increasing the SnSb2Se4 content leads to a decrease in the electrical contrast. Investigations of the samples by applying Fourier transform infrared spectroscopy and variable incident angle spectroscopic ellipsometry show that the optical properties of the amorphous phase are not affected by changes in stoichiometry. In striking contrast, the impact of SnSb2Se4...read more
Citations
More filters
Journal ArticleDOI
Broadband transparent optical phase change materials for high-performance nonvolatile photonics.
Yifei Zhang,Jeffrey B. Chou,Junying Li,Huashan Li,Qingyang Du,Anupama Yadav,Si Zhou,Mikhail Y. Shalaginov,Zhuoran Fang,Huikai Zhong,Christopher Roberts,Paul Robinson,Bridget Bohlin,Carlos Ríos,Hongtao Lin,Myungkoo Kang,Tian Gu,Jamie H. Warner,Vladimir Liberman,Kathleen Richardson,Juejun Hu +20 more
TL;DR: In this paper, a new class of optical phase change materials (O-PCM) based on Ge-Sb-Se-Te (GSST) was proposed to break the coupling between refractive index and optical loss allowing low loss performance benefits.
Phase change materials
TL;DR: In this paper, a pojam fazno promjenlji materijal (PCM), opisuje princip djelovanja PCM, i podrucja primjene.
Journal ArticleDOI
Extreme Broadband Transparent Optical Phase Change Materials for High-Performance Nonvolatile Photonics
Yifei Zhang,Jeffrey B. Chou,Junying Li,Huashan Li,Qingyang Du,Anupama Yadav,Si Zhou,Mikhail Y. Shalaginov,Zhuoran Fang,Huikai Zhong,Christopher Roberts,Paul Robinson,Bridget Bohlin,Carlos Ríos,Hongtao Lin,Myungkoo Kang,Tian Gu,Jamie H. Warner,Vladimir Liberman,Kathleen Richardson,Juejun Hu +20 more
TL;DR: Ge2Sb2Se4Te (GSST) as discussed by the authors is a new class of optical phase change materials (O-PCM) which exhibits large contrast of both refractive index and optical loss.
Journal ArticleDOI
Structural and optical properties of optimized amorphous GeTe films for memory applications
Aurelian Catalin Galca,Florinel Sava,I.D. Simandan,C. Bucur,Viorel Georgel Dumitru,Corneliu Porosnicu,C. Mihai,Alin Velea +7 more
TL;DR: In this article, the formation of a single and homogeneous amorphous GeTe (a-GeTe) phase is questionable since the deposited films can be mixtures of monoelemental nanoclusters.
References
More filters
Journal ArticleDOI
Phase-change materials for rewriteable data storage
Matthias Wuttig,Noboru Yamada +1 more
TL;DR: This review looks at the unique property combination that characterizes phase-change materials, in particular the contrast between the amorphous and crystalline states, and the origin of the fast crystallization kinetics.
Journal ArticleDOI
Rapid‐phase transitions of GeTe‐Sb2Te3 pseudobinary amorphous thin films for an optical disk memory
TL;DR: Amorphous films having a component of the stoichiometric GeTe-Sb2Te3 pseudobinary alloy system were found to have featuring characteristics for optical memory material presenting a large optical change and enabling high-speed one-beam data rewriting as mentioned in this paper.
Journal ArticleDOI
Resonant bonding in crystalline phase-change materials
TL;DR: Measurements of the dielectric function in the energy range from 0.025 to 3 eV reveal that the optical dielectrics constant is 70-200% larger for the crystalline than the amorphous phases.
Journal ArticleDOI
Phase Change Materials and Their Application to Nonvolatile Memories
TL;DR: Phase change materials are materials that exist in at least two structurally distinct solid phases, an amorphous and one (or more) crystalline phases that can be used to store information in technological applications if it is possible to switch the material repeatedly between the two phases and if both phases are stable at operating temperature.
Journal ArticleDOI
A map for phase-change materials.
Dominic Lencer,Martin Salinga,Blazej Grabowski,Tilmann Hickel,Jörg Neugebauer,Matthias Wuttig +5 more
TL;DR: A first treasure map for phase-change materials is presented on the basis of a fundamental understanding of the bonding characteristics, spanned by two coordinates that can be calculated just from the composition, and represent the degree of ionicity and the tendency towards hybridization ('covalency') of the bonded materials.
Related Papers (5)
Thermally-induced structural and electrical effects in GeTe-based amorphous alloys
Rod K. Quinn,Ralph T. Johnson +1 more