Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DS: Fachverband Dünne Schichten
DS 36: Poster Session I
DS 36.94: Poster
Donnerstag, 19. März 2015, 09:30–12:00, Poster A
Pulsed Laser Deposition of Multilayers designed for Phonon Blocking and Minimizing Thermal Conductivity — •Florian Döring1, Christian Eberl1, Sinja Pagel1, Christina Klamt1, Anna Major1, Henning Ulrichs2, Maria Mansurova2, Markus Münzenberg3, and Hans-Ulrich Krebs1 — 1Institute for Materials Physics, University of Göttingen — 21st Institute of Physics, University of Göttingen — 3Institute for Physics, University of Greifswald
Pulsed Laser Deposition (PLD) is a versatile thin film method for producing thin layers consisting of various materials, as metals (e.g. W, Ti, or Cu), oxides (e.g. ZrO2, MgO, or Ta2O5) and polymers (e.g. PC). This allows combining different kinds of materials to design multilayers with high acoustic mismatch at the interfaces resulting in different phonon dispersion relations in adjacent materials. By increasing the number of interfaces between such materials, the phonon mean free path is shortened and interface effects like reflection and scattering become more important leading to phonon blocking and henceforth to a decrease in phonon thermal conductivity. In this work, first the results of the structural properties (roughness, film thickness, composition and thermal stability) of laser deposited multilayers of different material combinations, which were carefully analyzed using x-ray reflectometry, x-ray diffraction and electron microscopy, are presented. Then, the phonon propagation and heat dissipation measured by ultrafast pump-probe reflectivity and transient thermal reflectometry experiments are shown.