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• W3105620187 startingPage "075101" @default.
• W3105620187 abstract "Accurate measurements of the cross-plane thermal conductivity {Lambda}_cross of a high-thermal-conductivity thin film on a low-thermal-conductivity ({Lambda}_s) substrate (e.g., {Lambda}_cross/{Lambda}_s>20) are challenging, due to the low thermal resistance of the thin film compared to that of the substrate. In principle, {Lambda}_cross could be measured by time-domain thermoreflectance (TDTR), using a high modulation frequency f_h and a large laser spot size. However, with one TDTR measurement at f_h, the uncertainty of the TDTR measurement is usually high due to low sensitivity of TDTR signals to {Lambda}_cross and high sensitivity to the thickness h_Al of Al transducer deposited on the sample for TDTR measurements. We observe that in most TDTR measurements, the sensitivity to h_Al only depends weakly on the modulation frequency f. Thus, we performed an additional TDTR measurement at a low modulation frequency f_0, such that the sensitivity to h_Al is comparable but the sensitivity to {Lambda}cross is near zero. We then analyze the ratio of the TDTR signals at f_h to that at f_0, and thus significantly improve the accuracy of our {Lambda}cross 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-{mu}m-thick Cu film, both with an accuracy of ~10%. The dual-frequency TDTR approach is useful for future studies of thin films." @default.
• W3105620187 created "2020-11-23" @default.
• W3105620187 creator A5012070321 @default.
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• W3105620187 date "2016-07-01" @default.
• W3105620187 modified "2023-10-16" @default.
• W3105620187 title "Accurate measurements of cross-plane thermal conductivity of thin films by dual-frequency time-domain thermoreflectance (TDTR)" @default.
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• W3105620187 doi "https://doi.org/10.1063/1.4954969" @default.
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• W3105620187 hasPublicationYear "2016" @default.
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