Transient thermal characterization of suspended monolayer MoS2
Robin Dolleman (Kavli institute of nanoscience Delft, TU Delft - QN/Steeneken Lab)
David Lloyd (Boston University)
M. Lee (TU Delft - QN/Steeneken Lab, Kavli institute of nanoscience Delft)
J. Scott Bunch (Boston University)
H. S J van der Zant (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)
Peter Steeneken (Kavli institute of nanoscience Delft, TU Delft - QN/Steeneken Lab, TU Delft - Dynamics of Micro and Nano Systems)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
We measure the thermal time constants of suspended single-layer molybdenum disulfide drums by their thermomechanical response to a high-frequency modulated laser. From this measurement, the thermal diffusivity of single-layer MoS2 is found to be 1.14×10-5m2/s on average. Using a model for the thermal time constants and a model assuming continuum heat transport, we extract thermal conductivities at room temperature between 10 to 40Wm-1K-1. Significant device-to-device variation in the thermal diffusivity is observed. Based on a statistical analysis we conclude that these variations in thermal diffusivity are caused by microscopic defects that have a large impact on phonon scattering but do not affect the resonance frequency and damping of the membrane's lowest eigenmode. By combining the experimental thermal diffusivity with literature values of the thermal conductivity, a method is presented to determine the specific heat of suspended 2D materials, which is estimated to be 255±104Jkg-1K-1 for single-layer MoS2.