Transient thermal characterization of suspended monolayer MoS2

Transient thermal characterization of suspended monolayer MoS2

Dolleman, R.J. (TU Delft QN/Steeneken Lab; Kavli institute of nanoscience Delft)
Lloyd, David (Boston University)
Lee, M. (TU Delft QN/Steeneken Lab; Kavli institute of nanoscience Delft)
Scott Bunch, J. (Boston University)
van der Zant, H.S.J. (TU Delft QN/van der Zant Lab; Kavli institute of nanoscience Delft)
Steeneken, P.G. (TU Delft Dynamics of Micro and Nano Systems; TU Delft QN/Steeneken Lab; Kavli institute of nanoscience Delft)

2018

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.

http://resolver.tudelft.nl/uuid:a258b680-2a5c-46f1-b73b-6d1635c719b7

https://doi.org/10.1103/PhysRevMaterials.2.114008

2475-9953

Physical Review Materials, 2 (11)

Institutional Repository

journal article

© 2018 R.J. Dolleman, David Lloyd, M. Lee, J. Scott Bunch, H.S.J. van der Zant, P.G. Steeneken