Universität zu Köln

Caretta, Antonio, Casarin, Barbara, Di Pietro, Paola, Perucchi, Andrea, Lupi, Stefano, Bragaglia, Valeria, Calarco, Raffaella, Lange, Felix Rolf Lutz, Wuttig, Matthias ORCID: 0000-0003-1498-1025, Parmigiani, Fulvio and Malvestuto, Marco (2016). Interband characterization and electronic transport control of nanoscaled GeTe/Sb2Te3 superlattices. Phys. Rev. B, 94 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

The extraordinary electronic and optical properties of the crystal-to-amorphous transition in phase-change materials have led to important developments in memory applications. A promising outlook is offered by nanoscaling such phase-change structures. Following this research line, we study the interband optical transmission spectra of nanoscaled GeTe/Sb2Te3 chalcogenide superlattice films. We determine, for films with varying stacking sequence and growth methods, the density and scattering time of the free carriers, and the characteristics of the valence-to-conduction transition. It is found that the free carrier density decreases with increasing GeTe content, for sublayer thicknesses below similar to 3 nm. A simple band model analysis suggests that GeTe and Sb2Te3 layers mix, forming a standard GeSbTe alloy buffer layer. We show that it is possible to control the electronic transport properties of the films by properly choosing the deposition layer thickness, and we derive a model for arbitrary film stacks.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Caretta, Antonio UNSPECIFIED UNSPECIFIED UNSPECIFIED Casarin, Barbara UNSPECIFIED UNSPECIFIED UNSPECIFIED Di Pietro, Paola UNSPECIFIED UNSPECIFIED UNSPECIFIED Perucchi, Andrea UNSPECIFIED UNSPECIFIED UNSPECIFIED Lupi, Stefano UNSPECIFIED UNSPECIFIED UNSPECIFIED Bragaglia, Valeria UNSPECIFIED UNSPECIFIED UNSPECIFIED Calarco, Raffaella UNSPECIFIED UNSPECIFIED UNSPECIFIED Lange, Felix Rolf Lutz UNSPECIFIED UNSPECIFIED UNSPECIFIED Wuttig, Matthias UNSPECIFIED orcid.org/0000-0003-1498-1025 UNSPECIFIED Parmigiani, Fulvio UNSPECIFIED UNSPECIFIED UNSPECIFIED Malvestuto, Marco UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-269449
DOI:	10.1103/PhysRevB.94.045319
Journal or Publication Title:	Phys. Rev. B
Volume:	94
Number:	4
Date:	2016
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PHASE-CHANGE MATERIALS; ELECTRICAL-PROPERTIES; CRYSTALLINE; TRANSITIONS; FILMS; GETE Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26944