Patent ID: 7273818

Claim:
A film-formation method for a semiconductor process, comprising: forming a silicon germanium film on a target substrate by CVD in a process field within a reaction container, while setting the process field at a first temperature, and supplying a first process gas of a silane family and a second process gas of a germane family into the process field, then, forming a silicon coating film to cover the silicon germanium film by CVD in the process field, while increasing temperature of the process field from the first temperature to a second temperature, supplying the first process gas into the process field, and stopping supply of the second process gas; and then, forming a silicon film on the coating film by CVD in the process field, while setting the process field at the second temperature, supplying the first process gas into the process field, and stopping supply of the second process gas, wherein the method further comprising, after forming the coating film and before forming the silicon film, annealing the coating film in the process field, while setting the process field at a temperature higher than the first temperature, supplying hydrogen gas into the process field, and stopping the supply of the first and second process gases.