High-k gate dielectrics prepared by liquid phase anodic oxidation

摘要

A method of preparing high-k gate dielectrics by liquid phase anodic oxidation, which first produces a metallic film on the surface of a clean silicon substrate, next oxidizes the metallic film to form a metallic oxide as a gate oxidizing layer by liquid phase anodic oxidation, then promoting quality of the gate oxidizing layer by processing a step of thermal annealing. With this oxidation, a gate dielectric layer of high quality, high-k and ultrathin equivalent oxide thickness (EOT) can be produced, which can be integrated into a complementary metal oxide semiconductor (CMOS) production process directly.