Temperature Rise in a Birefringent Substrate by RF Discharge Plasma Koichi Takaki, Member, Kunioh Sayama, Student Member, Atsushi Takahashi, Student M

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Temperature Rise in a Birefringent Substrate by RF Discharge Plasma Koichi Takaki, Member, Kunioh Sayama, Student Member, Atsushi Takahashi, Student Member, Tamiya Fujiwara, Member (Iwate University), Masakatsu Nagata, Member, Motoyuki Ono, Member (Fujikura Ltd.), Muaffaq Achmad Jani, Non-member (Iwate University) Temperature rises of a birefringent substrate (LiNbO3) have been measured in an argon RF discharge plasma. The measurement method is based on monitoring the variation of natural birefringence with temperature by laser interferometry. Using this method, the dependence of substrate temperature rise on applied RF power and gas pressure has been investigated. The evaluation of the temperature curves shows that heat flux from the plasma towards the substrate is independent of time and temperature. The magnitude of the flux differs largely from the applied power, and approximately 0.4% of the power. By measuring electron density, electron temperature and plasma potential with Langmuir probe, the energy of the ions incident on the substrate is estimated. The ion flux towards the substrate is calculated from the energy of ions and is compared with the measured heat flux. The dependence on the applied power is in approximate agreement between those fluxes. The temperature distribution over the substrate thickness is simulated numerically using the finite difference method.

Fig. 1. Schematic diagram of the experimental setup. Fig. 2. Relationship between substrate temperature and number of fringes.

Fig. 3. Temperature of the substrate as a function of time. Fig. 5. Substrate temperature rises with watercooling electrode. Fig. 4. Comparison between substrate temperature rises in the case of cooling and non-cooling electrodes.

Fig. 7. Separation of temperature rises in the substrate and the electrode surface. Fig. 6. Calculated temperature rises versus time, with heat transfer coefficient as parameter. Fig. 8. Heat transfer coefficient of the substrate.

Fig. 9. Temperature distribution over the substrate thickness. Fig. 10. Heat flux from plasma to the substrate as a function of RF power. Fig. 11. Plasma parameters as a function of RF power.

Electrochem. Soc., 131, 1164 (1984) (3) I. Hussla, K. Enke, H. Grunwald, G. Lorenz & H. Stoll: "In situ silicon-wafer temperature measurements during RF argon-ion plasma etching via fluoroptic thermometry", J. Phys. D: Appl. Phys., 20, 889 (1987) (4) M. Ulrickson: "Surface thermography", J. Vac. Sci. Technol., A4, 1805 (1986) (5) R. R. Manory: "A simple method for monitoring surface temperatures in plasma treatments", ibid., A4, 2329 (1986) (6) R. A. Bond, S. Dzioba & H. M. Naguib: "Temperature measurements of glass substrates during plasma etching", ibid., 18, 335 (1981) (7) R. Rochotzki & M. Friedrich: "Temperature measurements of polymer substrates (PMMA) in an RF discharge", IEE Proc., A139, 61 (1992) (8) T. Fujiwara & H. Yamada: "Temperature measurements of a birefringent substrate (LiNbO3) in a radio frequency discharge by laser interferometry", Rev. Sci. Instrum., 65, 267 (1994) (9) T. Fujiwara, Muaffaq Achmad Jani, M. Itagaki, S. Kato & H. Yamada: "Temperature measurements of birefringent substrate in RF discharge by laser interferometry", Proc. 12th Symp. on Plasma Processing, Sendai, 253 (1995) (10) T. Taniuchi & Y. Tsujimoto: "Fiber-Optic Temperature Sensor", National Tech. Report, 29, 23 (1983) (12) A. J. van Roosmalen, W. G. M. van den Hoek & H. Kalter: "Electrical properties of planar rf discharges for dry etch - ing", J. Appl. Phys., 58, No. 2, 653 (1985) (13) K. Kohler, J. W. Cobum, D. E. Home, E. Kay & J. H. Keller: "Plasma potentials of 13.56-MHz rf argon glow discharges in a planar system", J. Appl. Phys., 57, No. 1, 59 (1985) (1) R. J. Visser: "Determination of the power and current densities in argon and oxygen plasmas by in situ temperature measurements", J. Vac. Sci. Technol., A7, 189 (1989) (2) J. J. Hannon & J. M. Cook: "Oxidative Removal of Photoresist by Oxygen/Freon 116 Discharge Products", J.