Dresden 2020 – scientific programme
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DS: Fachverband Dünne Schichten
DS 38: 2D Materials and their Heterostructures III (joint session DS/HL)
DS 38.3: Talk
Thursday, March 19, 2020, 11:30–11:45, CHE 89
Thermal conductivity and thermal diffusivity of suspended few-layer h-BN using modified 3ω method — •Sofia Blanter1, Nicola Paradiso1, Denis Kochan2, Kenji Watanabe3, Takashi Taniguchi3, and Christoph Strunk1 — 1Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany — 2Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany — 3National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
We present measurements of thermal conductivity and thermal diffusivity for few-layer suspended hexagonal boron nitride between 25 and 300 K. The measurements are performed on 5-13 nm thick and suspended over a length of 2-10 µm h-BN flakes using a modified version of the 3 omega method.
We generate a temperature gradient by an AC current through a metal heater. Then we measure the temperature difference and the phase shift of the AC temperature response between the heater and a thermometer a small distance away. This allows us to assess the thermal diffusivity of the flake separately from that of the substrate.
Varying the distance between the heater and thermometer, we observe that the phase shift becomes temperature independent for short distances.