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Study of Thermal Resistances of Crystalline and Amorphous Thin Films
Jun-Gu Kang · Ho-Soon Yang ∗
Department of Physics, Pusan National University, Busan 609-735
J. W. Kim
Department of Mechanical Engineering, Pusan National University, Busan 609-735 (Received 31 January 2010, in final form 18 March 2010)
To compare the interfacial thermal resistances of thin films with different crystallinity and crystal structures, we measured the thermal conductivities of Gd
2Zr
2O
7, Y
2O
3, and diamond like carbon (DLC) thin films deposited on Al
2O
3substrate. Gd
2Zr
2O
7and Y
2O
3thin films are deposited by using an RF magnetron sputtering and DLC thin film is deposited with an ion gun method. The thermal conductivities of the thin films are measured by the 3ω method at the room tempera- ture. Thermal conductivities of all three thin films show a tendency of film thickness dependence.
The thickness dependent thermal conductivity is understood with the interfacial effect between a thin film and a substrate. It is noted that the interfacial thermal resistance is related with the crystallinity and crystal structure of films.
PACS numbers: 68.60.Dv
Keywords: Thermal conductivity, Interfacial thermal resistance, Gd
2Zr
2O
7,Y
2O
3, DLC
∗