Patent ID: 8716154

Claim:
A method for forming a conformal silicon oxide multi-layer on a patterned substrate in a substrate processing region of a processing chamber, wherein the patterned substrate has a densely patterned region and a sparsely patterned region, the method comprising sequential steps of: performing a first cycle of chemical vapor deposition comprising the operations: flowing BDEAS into the substrate processing region, flowing a first oxygen-containing precursor into the substrate processing region, wherein the operations of flowing the BDEAS and flowing the first oxygen-containing precursor are concurrent, and forming a first conformal silicon oxide sub-layer of the conformal silicon oxide multi-layer on the patterned substrate from the BDEAS and the first oxygen-containing precursor by chemical vapor deposition; removing unreacted and partially-reacted precursors from the substrate processing region; and performing a second cycle of chemical vapor deposition comprising the operations: flowing BDEAS into the substrate processing region, flowing a second oxygen-containing precursor into the substrate processing region, and forming a second conformal silicon oxide sub-layer of the conformal silicon oxide multi-layer on the patterned substrate from the BDEAS and the second oxygen-containing precursor by chemical vapor deposition, wherein a thickness of the first conformal silicon oxide sub-layer is about 100 Å or less.