Cited by 66Thermal properties of materialsThermography and Photoacoustic TechniquesThermoelastic and Magnetoelastic Phenomena

Accurate measurements of cross-plane thermal conductivity of thin films by dual-frequency time-domain thermoreflectance (TDTR)

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Jiang, Puqing, Huang, Bin, Koh, Yee Kan·2016·Review of Scientific Instruments

Abstract

Accurate measurements of the cross-plane thermal conductivity Λcross of a high-thermal-conductivity thin film on a low-thermal-conductivity (Λs) substrate (e.g., Λcross/Λs > 20) are challenging, due to the low thermal resistance of the thin film compared with that of the substrate. In principle, Λcross could be measured by time-domain thermoreflectance (TDTR), using a high modulation frequency fh and a large laser spot size. However, with one TDTR measurement at fh, the uncertainty of the TDTR measurement is usually high due to low sensitivity of TDTR signals to Λcross and high sensitivity to the thickness hAl of Al transducer deposited on the sample for TDTR measurements. We observe that in most TDTR measurements, the sensitivity to hAl only depends weakly on the modulation frequency f. Thus, we performed an additional TDTR measurement at a low modulation frequency f0, such that the sensitivity to hAl is comparable but the sensitivity to Λcross is near zero. We then analyze the ratio of the TDTR signals at fh to that at f0, and thus significantly improve the accuracy of our Λcross measurements. As a demonstration of the dual-frequency approach, we measured the cross-plane thermal conductivity of a 400-nm-thick nickel-iron alloy film and a 3-μm-thick Cu film, both with an accuracy of ∼10%. The dual-frequency TDTR approach is useful for future studies of thin films.

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Authors
Jiang, P., Huang, B., & Koh, Y. K.
Affiliations
National University of Singapore (SG)
Venue
Review of Scientific Instruments
Published
2016-07-01
Volume
87
Issue
7
Pages
075101-075101
ISSN
  • 0034-6748 (ISSN-L)
  • 1089-7623
OpenAlex
W2252624863
Cited by
66
References
36
Citations by year
2026: 13 · 2025: 5 · 2024: 5 · 2023: 9 · 2022: 7 · 2021: 3 · 2020: 4 · 2019: 7 · 2018: 8 · 2017: 3 · 2016: 2
FWCI
2.97
Type
journal article
Language
en
Open access
Locations
  • Review of Scientific Instruments (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
Ministry of Education - Singapore (R-265-000-364-133)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
  • Physical Sciences › Engineering › Mechanics of Materials › Thermography and Photoacoustic Techniques
  • Physical Sciences › Engineering › Mechanics of Materials › Thermoelastic and Magnetoelastic Phenomena
Keywords
through-plane thermal conductivity, time-domain thermoreflectance, dual-frequency measurements, thin films, substrate thermal conductivity, measurement accuracy, copper films, high thermal conductivity

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