Patent ID: 9187822
Filing Date: 2015-11-17
Classification: C23C,H01L

Abstract:
1. A method of forming a Ge—Sb—Te film formed of Ge 2 Sb 2 Te 5 on a substrate by CVD by disposing the substrate in a process chamber and using a gaseous Ge material, a gaseous Sb material, and a gaseous Te material, the method comprising: introducing the gaseous Ge material and the gaseous Sb material, or a small amount of the gaseous Te material not sufficient to form Ge after forming the precursor film, introducing the gaseous Ge material into the process chamber to cause Ge to be adsorbed to the precursor film; and after Ge is adsorbed to the precursor film by introducing the gaseous Ge material into the process chamber, introducing the gaseous Te material into the process chamber to cause Te to be adsorbed to the precursor film so that the concentration of Te in the precursor film is adjusted, wherein when forming the precursor film, the gaseous Ge material and the gaseous Sb material or the small amount of the gaseous Te material not sufficient to form Ge wherein the precursor film contains Ge in an amount smaller than that in Ge