Aminosilanes for shallow trench isolation films
View Patent ↗The present invention is a process for spin-on deposition of a silicon dioxide-containing film under oxidative conditions for gap-filling in high aspect ratio features for shallow trench isolation used in memory and logic circuit-containing semiconductor substrates, such as silicon wafers having one or more integrated circuit structures contained thereon, comprising the steps of: providing a semiconductor substrate having high aspect ratio features; contacting the semiconductor substrate with a liquid formulation comprising a low molecular weight aminosilane; forming a film by spreading the liquid formulation over the semiconductor substrate; heating the film at elevated temperatures under oxidative conditions. Compositions for this process are also set forth.
1. A spin on composition useful for gap filling silicon dioxide depositions, comprising:
an aminosilane selected from a first group consisting of bis(tertiarybutylamino)silane and di-isopropylaminosilane and a chemical of a second group selected from the group consisting of triethoxysilane, tetraacetoxysilane, tetraethylorthosilicate, tetramethoxysilane, tetrapropoxysilane, phenyltriethoxysilane, phenyltriacetoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, methylacetoxysilane, phenyltrimethoxysilane, ethyltriethoxysilane, ethyltrimethoxysilane, ethyltriacetoxysilane, hexaethoxydisilane, hexamethoxydisilane and mixtures thereof;
a solvent selected from the group consisting of glycol ethers, alcohols, glycol ether acetates, esters, amines, amides, ketones and mixtures thereof; and,
catalyst selected from the group consisting of hydrochloric acid, nitric acid, formic acid, acetic acid, maleic acid, oxalic acid and mixtures thereof.