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Issue
Korean Journal of Chemical Engineering,
Vol.21, No.6, 1256-1259, 2004
Fourier Transform Infrared Spectroscopy Studies on Thermal Decomposition of Tetrakis-dimethyl-amido Zirconium for Chemical Vapor Deposition of ZrN
Kim IW, Kim SJ, Kim DH, Woo H, Park MY, Rhee SW
The decomposition behavior of tetrakis (dimethylamido) zirconium (TDMAZ) under various ambient gases was studied by using in-situ Fourier transform infrared spectroscopy (FTIR) aimed at understanding the gas phase reactions and also at selecting the appropriate process conditions for ZrN chemical vapor deposition (CVD). The infrared absorbance of the stretching vibration at 933.37 cm-1 was employed to monitor the degree of dissociation of the gaseous TDMAZ. In the case of argon and nitrogen atmospheres, TDMAZ starts to decompose at above 300 ℃, while in a hydrogen atmosphere it starts to decompose at above 350 ℃. To evaluate the effect of the decomposition behavior of the precursor on CVD ZrN, the ZrN films were grown at 150-375 ℃ under Ar, N2, and H2. A clear difference in transition temperature of controlling from surface reaction to gas phase mass transfer was observed: The ZrN growth rate decreased rapidly at above 300 ℃ under Ar or N2 atmospheres, and increased continuously with increase of the deposition temperature under an H2 atmosphere.
Keywords: Thin Films; Zirconium Nitrides; CVD; FTIR
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