Patent ID: 6331325
Filing Date: 2001-12-18
Classification: H01L,Y10T

Abstract:
A method of forming a barium and/or strontium titanate dielectric film on a microelectronic device, said method comprising:(a) preparing a precursor solution by combining a boron compound, a titanium compound, and a precursor selected from the group consisting of barium compounds, strontium compounds, and combinations thereof, such that the molar ratio of boron to titanium in said precursor solution is between 0.001 and 0.1;(b) depositing and densifying one or more layers of said precursor solution to form a precursor film on said device; and(c) annealing said precursor film in an oxygen-containing atmosphere, thereby forming said dielectric film comprising substantially uniformly distributed first and second phases, said first phase containing a plurality of barium and/or strontium titanate grains and said second phase principally comprising boron oxide, whereby said boron in said precursor apparently lowers the processing temperature required to produce said titanate grains, and whereby boron additionally decreases the dielectric leakage current observed for said dielectric film.