Universität zu Köln

Zalden, Peter ORCID: 0000-0002-8530-0576, Koch, Christine, Paulsen, Melf, Esters, Marco, Johnson, David C., Wuttig, Matthias, Lindenberg, Aaron M. and Bensch, Wolfgang ORCID: 0000-0002-3111-580X . Acceleration of Crystallization Kinetics in Ge-Sb-Te-Based Phase-Change Materials by Substitution of Ge by Sn. Adv. Funct. Mater.. WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1616-3028

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Abstract

Thin films of (Ge1-xSnx)(8)Sb(2)Te(11)are prepared to study the impact of Sn-substitution on properties relevant for application in phase-change memory, a next-generation electronic data storage technology. It is expected that substitution decreases the crystallization temperature, but it is not known how the maximum crystallization rate is affected. Ge(8)Sb(2)Te(11)is chosen from the (GeTe)(y)(Sb2Te3)(1-)(y)system of phase-change materials as a starting point due to its higher crystallization temperature as compared to the common material Ge2Sb2Te5. In situ X-ray diffraction at 5 K min(-1)heating rate is performed to determine the crystallization temperature and the resulting structure. To measure the maximum crystallization rate, femtosecond optical pulses that heat the material repetitively and monitor the resulting increase of optical reflectance are used. Glasses over the entire composition range are prepared using a melt-quenching process. While atx = 0, 97, subsequent pulses are required for crystallization, one single pulse is enough to achieve the same effect atx = 0.5. The samples are further characterized by optical ellipsometry and calorimetry. The combined electrical and optical contrast and the ability to cycle between states with single femtosecond pulses renders Ge(4)Sn(4)Sb(2)Te(11)promising for photonics applications.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zalden, Peter UNSPECIFIED orcid.org/0000-0002-8530-0576 UNSPECIFIED Koch, Christine UNSPECIFIED UNSPECIFIED UNSPECIFIED Paulsen, Melf UNSPECIFIED UNSPECIFIED UNSPECIFIED Esters, Marco UNSPECIFIED UNSPECIFIED UNSPECIFIED Johnson, David C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wuttig, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Lindenberg, Aaron M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bensch, Wolfgang UNSPECIFIED orcid.org/0000-0002-3111-580X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-318213
DOI:	10.1002/adfm.202004803
Journal or Publication Title:	Adv. Funct. Mater.
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1616-3028
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language AMORPHOUS GE2SB2TE5; CHANGE MECHANISM; THIN-FILMS; TRANSITION; VISCOSITY; DESIGN Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/31821