Thermal model for time-domain thermoreflectance experiments in a laser-flash geometry

Peng, Wanyue; Wilson, Richard B.

doi:10.1063/5.0082549

Thermal model for time-domain thermoreflectance experiments in a laser-flash geometry

Journal Article · Mon Apr 04 00:00:00 EDT 2022 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0082549· OSTI ID:1860943

Peng, Wanyue;

Time-domain thermoreflectance (TDTR) is a well-established pump–probe method for measuring thermal conductivity and interface conductance of multilayers. Interpreting signals in a TDTR experiment requires a thermal model. In standard front/front TDTR experiments, both pump and probe beams typically irradiate the surface of a multilayer. As a result, existing thermal models for interpreting thermoreflectance experiments assume that the pump and probe beams both interact with the surface layer. Here, we present a frequency-domain solution to the heat-diffusion equation of a multilayer in response to nonhomogeneous laser heating. This model allows analysis of experiments where the pump and probe beams irradiate opposite sides of a multilayer. We call such a geometry a front/back experiment to differentiate such experiments from standard TDTR experiments. As an example, we consider a 60nm amorphous Si film. We consider how signals differ in a front/front vs front/back geometry and compare thermal model predictions to experimental data.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0021230

OSTI ID:: 1860943

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 13 Vol. 131; ISSN 0021-8979

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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