Thermal characterization of Au-Si multilayers using 3-omega method

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Presentation transcript:

Thermal characterization of Au-Si multilayers using 3-omega method PHYS 211A Thermal characterization of Au-Si multilayers using 3-omega method Sunmi Shin Materials Science and Engineering Program

Conventional steady-state system to measure thermal conductivity Fourier’s Law of heat conduction: Q: input power ∆T: temperature difference t: thickness A: cross-sectional area What is the weaknesses? Long thermal equilibrium time Errors due to black body radiation

What is 3-omega measurement? Nano lett., 14, 2448-2455 (2014)

How to extract thermal conductivity [1] Apply AC current  Heat generates a temperature fluctuation.  R is influenced by temperature oscillation. Temperature coefficient of resistance (TCR)

How to extract thermal conductivity [2] T depends on k. k can be extracted from V3ω vs ω. Slope of the curve on logscale  Indicative of k Measured 3ω voltage How?

Thermal conductivity with 1D heat conduction Heated region: semi-circle 1/q: thermal penetration depth f: input frequency D: thermal diffusivity of the specimen Slope of the curve

Application: Au-Si multilayers with ultralow k Highly dissimilar interfaces lower the thermal conductivity. DTR ~ 1.6 DTR ~ 18.7 Nano lett., 14, 2448-2455 (2014) Debye temperature ratio (DTR): 3.9 Phy. Rev. B 73, 144301 (2006)

Temperature gradient within specimen Substrate Film Heater Film Substrate Heater Nano lett., 14, 2448-2455 (2014)

Measured thermal conductivity of Au-Si multilayers Nano lett., 14, 2448-2455 (2014)

Thank you!