Patent ID: 8460753

Claim:
A low pressure, thermal chemical vapor deposition method of forming a silicon dioxide film that has extremely low wet etch rate in HF solution, comprising: a. delivering a first precursor that provides a source for silicon to a low pressure, thermal chemical vapor deposition reactor in which the first precursor is selected from the group consisting of: R 1 n R 2 m Si(NR 3 R 4 ) 4-n-m , and a cyclic silazane of (R 1 R 2 SiNR 3 ) p ; where R 1 is a C 2 -C 10 alkenyl or aromatic; R 2 , R 3 , and R 4 are selected from H, alkyl with C 1 -C 10 , linear, branched, or cyclic, an alkenyl with C 2 -C 10 linear, branched, or cyclic, and aromatic; and n=1-3, m=0-2, p=3-4; b. delivering a second precursor that provide a source for oxygen to the reactor; c. reacting the first and second precursors at temperature between 400° C. to 700° C. under a pressure of 100 mT to 1 T.