Patent ID: 6277436
Filing Date: 2001-08-21
Classification: C23C,H01L

Abstract:
A liquid delivery metal-organic chemical vapor deposition process for forming a dielectric metal titanate film on a substrate, wherein said dielectric metal titanate film has a dielectric constant k>40 and a second order voltage coefficient a.sub.2 <100 ppm/V.sup.2, both measured at 20.degree. C., and said metal titanate film contains at least 60 atom % titanium, said process comprising:providing a precursor liquid source material including a solution or suspension, comprising a metal-organic precursor and a solvent, for each of the metal components of the metal titanate film;flash vaporizing the precursor liquid source material at a temperature of from about 100.degree. C. to about 300.degree. C. to form a precursor vapor;transporting the precursor vapor in a carrier gas to a chemical vapor deposition reactor containing a substrate element;introducing an oxidant component into the chemical vapor deposition reactor;contacting the precursor vapor and oxidant component with the substrate element in the chemical vapor deposition reactor at a temperature from about 550.degree. C. to about 1200.degree. C., at a pressure in the chemical vapor deposition reactor of from about 0.1 torr to about 760 torr, to form a dielectric metal titanate film on the substrate element;wherein said contacting of the precursor vapor and oxidant component with the substrate element is carried out for sufficient time to grow said dielectric metal titanate film on the substrate to a thickness of from about 0.01 .mu.m to about 200 .mu.m, and wherein proportions of each of the metal components of the metal titanate film, temperature of the substrate element in the chemical vapor deposition reactor, pressure in the chemical vapor deposition reactor, delivery rate of said precursor vapor and introduction rate of said oxidant component into the chemical vapor deposition reactor are controlled in relation to one another to yield said dielectric metal titanate film on the substrate having a dielectric constant k>40 and a second order voltage coefficient a.sub.2 <100 ppm/V.sup.2, both measured at 20.degree. C., wherein said metal titanate film contains at least 60 atom % titanium.