Patent ID: 8304021

Claim:
A method for forming a thin film on a substrate by employing a vapor phase deposition apparatus having a chamber, a piping unit including a vaporizing unit, a first piping connected to said chamber, a second piping connected to said vaporizing unit, a valve provided between said first piping and said second piping, and a temperature controlling unit that controls temperature of said piping unit, vaporizing a source material by using said vaporizing unit to generate a source gas; introducing said source gas from said vaporizing unit into said chamber through said piping unit; and depositing a thin film from said source gas in said chamber, wherein a temperature of said valve is controlled independently from a temperature of said first piping and said second piping, and is controlled to be within a range of from a temperature that is not lower than a vaporization temperature of said source gas and not higher than a temperature that is higher by 20° C. than a decomposition temperature of said source gas, wherein said first piping extends from an outlet of said valve to an inlet of said chamber, and said second piping extends from an outlet of said vaporizing unit to an inlet of said valve.