Patent ID: 8927060
Filing Date: 2015-01-06
Classification: C23C,G11B,H01L

Abstract:
1. A method for forming a Ge—Sb—Te film having a composition of Ge 2 Sb 2 Te 5 on a substrate by a CVD method using a gaseous Ge source material, a gaseous Sb source material and a gaseous Te source material, the method comprising: loading the substrate within a processing chamber; performing a first stage film forming process to form a first film on the substrate by supplying the gaseous Ge source material and the gaseous Sb source material, or by supplying the gaseous Ge source material, the gaseous Sb source material and the gaseous Te source material, the gaseous Te source material being of such amount that Ge after performing the first stage film forming process, performing a second stage film forming process to form a second film on the first film by supplying the gaseous Sb source material and the gaseous Te source material, or by supplying the gaseous Sb source material, the gaseous Te source material and the gaseous Ge source material, the gaseous Ge source material being of such amount that Ge after performing the first stage film forming process only once and the second stage film forming process only once, unloading the substrate from the processing chamber, wherein the first film formed in the first stage film forming process and the second film formed in the second stage film forming process are unified during the second stage film forming process, so that the Ge—Sb—Te film having a smooth surface and having the composition of Ge