Patent ID: 7776742
Filing Date: 2010-08-17
Classification: C23C,H01L

Abstract:
1. A film formation method for forming a metal nitride film having a predetermined thickness on a target substrate within a process container configured to be selectively supplied with a metal compound gas and a nitrogen-containing reducing gas, the film formation method being preset to repeat a cycle a plurality of times while heating the target substrate at a film formation temperature, the cycle comprising: a first step of supplying the metal compound gas and the nitrogen-containing reducing gas into the process container, thereby forming a film of a metal nitride by CVD, while carrying the metal compound gas via nitrogen gas supplied through a first flow-rate controller and carrying the nitrogen-containing reducing gas via nitrogen gas supplied through a second flow-rate controller; then, a first purge step of supplying a purge gas into the process container without supplying the metal compound gas and the nitrogen-containing reducing gas into the process container, thereby purging the process container; then, a second step of supplying the nitrogen-containing reducing gas into the process container without supplying the metal compound gas into the process container, while carrying the nitrogen-containing reducing gas via nitrogen gas supplied through the second flow-rate controller; and then, a second purge step of supplying a purge gas into the process container without supplying the metal compound gas and the nitrogen-containing reducing gas into the process container, thereby purging the process container, wherein the film formation temperature is set to be less than 450° C., the process container is set to have therein a total pressure of 100 to 667 Pa in the first and second steps, the nitrogen-containing reducing gas is set to have a partial pressure of 30 Pa or less within the process container in the first step, and the nitrogen-containing reducing gas is set to have a partial pressure of more than 100 Pa within the process container in the second step.