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This article is cited in 32 scientific papers (total in 32 papers)
Laser applications and other topics in quantum electronics
Measurement of thermal conductivity of polycrystalline CVD diamond by laser-induced transient grating technique
E. V. Ivakina, A. V. Sukhodolova, V. G. Ral'chenkob, A. V. Vlasovb, A. V. Khomichc a B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk
b Natural Sciences Center at General Physics Institute of RAS, Moscow
c Institute of Radioengineering and Electronics Russian Academy of Sciences, Fryazino
Abstract:
The tangential thermal diffusivity $D_\parallel$ and thermal conductivity $k_\parallel$ of diamond plates grown from the gaseous phase by chemical vapour deposition (CVD diamond) are determined by the transient grating technique in the temperature range 25 – 200$^\circ$C. Samples of insulating and boron-doped polycrystalline diamond of thickness about 0.3 mm and diameter 63 mm were synthesised in a microwave discharge in mixtures of methane and hydrogen. In view of the intense light scattering by the samples, a photosensitive grating recording technique was developed and used for measurements. It was found that the value $k_\parallel$ amounts to 18 – 20 W cm $^{-1}$ K $^{-1}$ at room temperature, approaching the thermal conductivity of the highest purity single crystals of diamond. A comparison of the value of $k_\parallel$ with the normal thermal conductivity $k_\perp$ determined by the flash method reveals a thermal conductivity anisotropy of about 10% – 20% associated with the texture of the diamond film, the normal component of thermal conductivity being larger than the tangential component. Boron-doped diamond displays a dependence of the transient grating kinetics on the excitation wavelength. The obtained results indicate that CVD diamond is a promising material for preparing efficient heat sinks, especially of large size, used in microelectronic devices and laser engineering.
Received: 08.02.2002
Citation:
E. V. Ivakin, A. V. Sukhodolov, V. G. Ral'chenko, A. V. Vlasov, A. V. Khomich, “Measurement of thermal conductivity of polycrystalline CVD diamond by laser-induced transient grating technique”, Kvantovaya Elektronika, 32:4 (2002), 367–372 [Quantum Electron., 32:4 (2002), 367–372]
Linking options:
https://www.mathnet.ru/eng/qe2200 https://www.mathnet.ru/eng/qe/v32/i4/p367
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