Transient thermal characterization of suspended monolayer MoS2
Files
Accepted manuscript
Date
2018-11-26
Authors
Dolleman, Robin J.
Lloyd, David
Lee, Martin
Bunch, Joseph
van der Zant, Herre S.J.
Steeneken, Peter G.
Version
Accepted manuscript
OA Version
Citation
Robin J Dolleman, David Lloyd, Martin Lee, J Scott Bunch, Herre SJ van der Zant, Peter G Steeneken. 2018. "Transient thermal characterization of suspended monolayer MoS2." PHYSICAL REVIEW MATERIALS, Volume 2, Issue 11, 8 pp. https://doi.org/10.1103/PhysRevMaterials.2.114008
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^−5m^2/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.