Download file (2.85 MB)
Download as zip (2.42 MB)

Collection

Citation

Description:

The thermo-reflectance technique is one of the few methods which can measure thermal diffusivity of thin films as thin as 100 nm or thinner in the cross-plane direction. Up to now it has typically only been possible to attempt to evaluate the interfacial thermal resistance between the thin films by preparing and measuring several samples with different thicknesses. In this study, a method to directly determine interfacial thermal resistance by a single measurement of a thin film on substrate is represented, by analyzing the shape of thermo-reflectance signals with analytical solutions in frequency domain and time domain. Thermo-reflectance signals observed from metallic thin films on sapphire substrate with different thickness steps were analyzed by Fourier analysis and fitted by analytical equations with four parameters: heat diffusion time across the first layer, ratio of virtual heat sources, characteristic time of cooling determined by interfacial thermal resistance and relative amplitude of the signal. Interface thermal resistance between the thin film and substrate was able to be determined reliably with smaller uncertainty.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: thermal conductivity

Date published: 2024-02-01

Publisher: Springer Science and Business Media LLC

Journal:

• International Journal of Thermophysics (ISSN: 0195928X) 27

Funding:

• JST-Mirai Program JPMJMI19A1
• Japan Science and Technology Agency JPMJSP2124

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1007/s10765-023-03324-w

Related item:

Other identifier(s):

Contact agent:

Updated at: 2024-08-01 08:30:09 +0900

Published on MDR: 2024-08-01 08:30:09 +0900