Frequency-resolved Raman Thermometry Analysis via a Multi-layer Heat Transfer Model for Bulk and Low-dimensional Materials

Raman thermometry is advantageous for measuring the thermal transport of low-dimensional materials due to its non-contact nature. Transient Raman methods have improved the accuracy of steady-state Raman thermometry by removing the need for accurate temperature calibration and laser absorption evaluation. However, current methods often resort to finite element analysis (FEA) to decipher the measured signals. This step is time-consuming and impedes its ubiquitous adaptation. In this work, we replace the FEA by fitting the transient-state Raman signal to a three-dimensional (3D) analytical heat transfer model for measuring the thermal conductivity of two bulk layered materials [i.e., molybdenum disulfide (MoS2) and bismuth selenide (Bi2Se3) crystals] and the interfacial thermal conductance (h) of CVD-grown MoS2 and molybdenum di-selenide (MoSe2) on quartz (SiO2). Our measured results agree reasonably well with literature and theoretical calculations. We also performed a quantitative sensitivity analysis to give insights on how to improve the measurement sensitivity. Our work provides an efficient way to process the data of transient-based Raman thermometry for high throughput measurements.