Patent ID: 7347900

Claim:
A chemical vapor deposition apparatus, comprising: a process chamber, inside of which a wafer is secured to perform a deposition process thereon; a gas supply assembly mounted in the process chamber and configured to supply a process gas inside the process chamber, wherein the gas supply assembly is divided into a first section that occupies a center portion of the gas supply assembly, and a second section that occupies an outer portion of the gas supply assembly, a process gas line is connected to each of the first section and the second section, and a control valve, opened and closed by the controller, is mounted on the process gas line of the second section; a vacuum pump mounted in the process chamber and configured to exhaust the process gas from the process chamber; a chuck mounted in the process chamber and configured to support the wafer; a position control assembly configured to raise and lower the chuck; and a controller constructed and arranged to control the position control assembly such that a distance between the wafer and the gas supply assembly is varied from an initial position, to an intermediate position, and to an end position during the deposition process, wherein the controller controls the position control assembly such that the distance between the wafer and the gas supply assembly is successively increased from the initial position, to the intermediate position, and to the end position, and wherein the controller controls the control valve to direct the supply of the process gas from the first section of the gas supply assembly while at the initial position, and to the first and second section of the gas supply assembly while at the intermediate and end position.