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Suche nach „[Fabian] [Kühnel]“ hat 5 Publikationen gefunden
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    NachhaltigF: Elektrotechnik und Medientechnik

    Zeitschriftenartikel

    Christoph Metzke, Fabian Kühnel, Jonas Weber, Günther Benstetter

    Scanning Thermal Microscopy of Ultrathin Films: Numerical Studies Regarding Cantilever Displacement, Thermal Contact Areas, Heat Fluxes, and Heat Distribution

    Nanomaterials, vol. 11, no. 2

    2021

    DOI: 10.3390/nano11020491

    Abstract anzeigen

    New micro- and nanoscale devices require electrically isolating materials with specific thermal properties. One option to characterize these thermal properties is the atomic force microscopy (AFM)-based scanning thermal microscopy (SThM) technique. It enables qualitative mapping of local thermal conductivities of ultrathin films. To fully understand and correctly interpret the results of practical SThM measurements, it is essential to have detailed knowledge about the heat transfer process between the probe and the sample. However, little can be found in the literature so far. Therefore, this work focuses on theoretical SThM studies of ultrathin films with anisotropic thermal properties such as hexagonal boron nitride (h-BN) and compares the results with a bulk silicon (Si) sample. Energy fluxes from the probe to the sample between 0.6 µW and 126.8 µW are found for different cases with a tip radius of approximately 300 nm. A present thermal interface resistance (TIR) between bulk Si and ultrathin h-BN on top can fully suppress a further heat penetration. The time until heat propagation within the sample is stationary is found to be below 1 µs, which may justify higher tip velocities in practical SThM investigations of up to 20 µms−1. It is also demonstrated that there is almost no influence of convection and radiation, whereas a possible TIR between probe and sample must be considered.

    NachhaltigF: Elektrotechnik und MedientechnikI: IQMA

    Vortrag

    Fabian Kühnel, Christoph Metzke, Günther Benstetter

    Thermal conductivity measurements of thin films using 3ω method

    7. Tag der Forschung, Deggendorf

    2020

    NachhaltigF: Elektrotechnik und MedientechnikI: IQMA

    Vortrag

    Christoph Metzke, Fabian Kühnel, Günther Benstetter

    Thermal characterization of thin films using FEM simulations

    7. Tag der Forschung, Deggendorf

    2020

    NachhaltigF: Elektrotechnik und MedientechnikI: IQMA

    Zeitschriftenartikel

    Christoph Metzke, Werner Frammelsberger, Jonas Weber, Fabian Kühnel, K. Zhu, M. Lanza, Günther Benstetter

    On the Limits of Scanning Thermal Microscopy of Ultrathin Films

    Materials, vol. 13, no. 3

    2020

    DOI: 10.3390/ma13030518

    Abstract anzeigen

    Heat transfer processes in micro- and nanoscale devices have become more and more important during the last decades. Scanning thermal microscopy (SThM) is an atomic force microscopy (AFM) based method for analyzing local thermal conductivities of layers with thicknesses in the range of several nm to µm. In this work, we investigate ultrathin films of hexagonal boron nitride (h-BN), copper iodide in zincblende structure (γ-CuI) and some test sample structures fabricated of silicon (Si) and silicon dioxide (SiO2) using SThM. Specifically, we analyze and discuss the influence of the sample topography, the touching angle between probe tip and sample, and the probe tip temperature on the acquired results. In essence, our findings indicate that SThM measurements include artefacts that are not associated with the thermal properties of the film under investigation. We discuss possible ways of influence, as well as the magnitudes involved. Furthermore, we suggest necessary measuring conditions that make qualitative SThM measurements of ultrathin films of h-BN with thicknesses at or below 23 nm possible.

    NachhaltigF: Elektrotechnik und MedientechnikI: IQMA

    Vortrag

    Christoph Metzke, Günther Benstetter, Werner Frammelsberger, Jonas Weber, Fabian Kühnel

    Temperature dependent investigation of hexagonal boron nitride films using scanning thermal microscopy

    Poster presentation

    6th Nano Today Conference 2019, Lisbon, Portugal

    2019