“…In addition, both the precursor conversion percent and the average deposition rate remain unchanged, regardless of the presence or not of NH3 in the inlet gas for similar O2 flow rate and deposition temperature. In contrast, the carbon content of the films significantly increases under an ammonia-free atmosphere, suggesting that the key role of ammonia in the studied chemistry is to participate in the reduction of carbon incorporation in the film rather than to provide nitrogen, in agreement with previous works from Xia et al 40 and Tijanic et al 41 11, 14 and 15 being identified. Among these molecules, only 4 is a SiMe3 containing derivative, which correlates well with the overall lower carbon content in the films in comparison to Exp1 and Exp3.…”