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Structural and Thermal Characterisation of Nanofilms by Time-Resolved X-ray Scattering

Plech, Anton; Krause, Bärbel; Baumbach, Tilo; Zakharova, Margarita; Eon, Soizic; Girmen, Caroline; Buth, Gernot; Bracht, Hartmut

High time resolution in scattering analysis of thin films allows for determination of thermal conductivity by transient pump-probe detection of dissipation of laser-induced heating, TDXTS. We describe an approach that analyses the picosecond-resolved lattice parameter reaction of a gold transducer layer on pulsed laser heating to determine the thermal conductivity of layered structures below the transducer. A detailed modeling of the cooling kinetics by a Laplace-domain approach allows for discerning effects of conductivity and thermal interface resistance as well as basic depth information. The thermal expansion of the clamped gold film can be calibrated to absolute temperature change and effects of plastic deformation are discriminated. The method is demonstrated on two extreme examples of phononic barriers, isotopically modulated silicon multilayers with very small acoustic impedance mismatch and silicon-molybdenum multilayers, which show a high resistivity.

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Verlagsausgabe §
DOI: 10.5445/IR/1000093236
Veröffentlicht am 03.04.2019
DOI: 10.3390/nano9040501
Zitationen: 2
Web of Science
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Laboratorium für Applikationen der Synchrotronstrahlung (LAS)
Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 2079-4991
KITopen-ID: 1000093236
HGF-Programm 56.03.20 (POF III, LK 01)
Nanoscience a.Material f.Inform.Technol.
Erschienen in Nanomaterials
Band 9
Heft 4
Seiten Article: 501
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 01.04.2019
Schlagwörter thin films; multilayers; thermal conductivity; thermal expansion; laser heating; synchrotron pump-probe powder scattering
Nachgewiesen in Web of Science
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