화학공학소재연구정보센터
Chemical Physics Letters, Vol.340, No.3-4, 343-347, 2001
Molecular orbital studies of titanium nitride chemical vapor deposition: gas phase beta-elimination
Chemical vapor deposition (CVD) of titanium nitride can be carried out using Ti(NR2)(4) and NH3 (R = Me or Et). Imido compounds are thought to be key intermediates in this process. Formation of Ti(NR2)(2)=NH from TI(NR2)(4) can proceed by ligand exchange with NH3 followed by elimination of NHR2. When R = Et there is an alternate beta -elimination pathway that also leads to imido formation. At the B3LYP16-311G(d) level of theory, this pathway has a barrier of 51.1 kcal/mol and the reaction is endothermic by 68.0 kcal/mol. By comparison, ligand exchange has a barrier of 35.5 kcal/mol, suggesting that beta -elimination does not contribute significantly to Ti(NR2)(2)=NH formation.