Patent ID: 7179537

Claim:
A spin-on glass composition for use in a silicon oxide layer formed to fill a trench during semiconductor manufacturing, said composition comprising: perhydropolysilazane having the compound formula —(SiH 2 NH) n — wherein n represents a positive integer, in an amount of about 10 to about 30% by weight, based on the total weight of the composition, whereby the perhydropolysilazane has a weight average molecular weight within the range of about 6000 to 8000 and a molecular weight dispersion within the range of about 3.0 to 4.0; and a solvent in an amount of about 70–90% by weight, based on the total weight of the composition, wherein the spin-on glass composition includes at least one impurity material selected from the group consisting of boron, fluorine, phosphorous, arsenic, carbon, oxygen, and mixtures thereof.