Abstract: Methods for forming a Si-containing film on a substrate comprise heating the substrate to a temperature higher than S50° C., exposing the substrate to a vapor including a Si-containing film forming composition containing a Si-containing precursor having the formula: SiR1yR24-x-y(NH—SiR?3)x, wherein x=2, 3, 4; y=0, 1, 2, R1 and R2 each are independently selected from H, a halogen (Cl, Br, I), an C1-C4 alkyl, an isocyanate, a C1-C4 alkoxide, or an —NR3R4 group in which R3 and R4 each are independently selected from H, a C1-C4 alkyl, provided that if R3?H, R4>C1; each R? is independently selected from H, a halogen (Cl, Br, I), or a C1-C4 alkyl, and depositing the Si-containing precursor onto the substrate to form the Si-containing film on the substrate through an ALD process. The Si-containing precursor may be selected from SiH2(NH—Si(CH3)3)2, SiHCl(NH—Si(CH3)3)2, SiCl2(NH—Si(CH3)3)2, SiH(NH—Si(CH3)3)3, SiCl(NH—Si(CH3)3)3, or Si(NH—Si(CH3)3)4.

Abstract: Methods for forming a Ge-containing film on a substrate comprise the steps of introducing a vapor of a cyclic Ge(II) silylamido precursor into a reactor having the substrate disposed therein and depositing at least part of the cyclic Ge(II) silylamido precursor onto the substrate to form the Ge-containing film using a vapor deposition method. The cyclic Ge(II) silylamido precursor is [SiMe3-(N—)—SiMe2-(N—)—SiMe3]Ge(II) or [tBu-(N—)—SiMe2-(N—)-tBu]Ge(II).