Patent ID: 8920565

Claim:
A metalorganic chemical vapor deposition reactor for depositing a film onto substrates, employing a reaction gas, the metalorganic chemical vapor deposition reactor comprising: a rotatable heating member having a carrying surface for carrying a plurality of the substrates and heating the substrates, the carrying-surface areas where the heating member carries substrates defining a substrate-carrying locus whose perimeter lies on the carrying-surface areas' outer edges; and a duct for conducting the reaction gas to the substrates; wherein the carrying surface of said heating member fronts on the interior of said duct; said duct has a first channel and a second channel, and the first channel and the second channel merge in an end of said duct upstream of the upstream edge of the carrying surface; the height of said duct along the direction of the reaction gas flow monotonically diminishes heading downstream from a first point to a second point, stays constant from the second point to a third point, from the third point immediately diminishes and monotonically continues to diminish heading downstream from the third point, and becomes constant from a fourth point; and the first point lies upstream of the upstream edge of the perimeter of the substrate-carrying locus on the heating-member carrying surface, the third point lies on a line normal to and passing through said heating member and within the perimeter of the substrate-carrying locus, and the fourth point lies at the downstream edge of the perimeter of the substrate-carrying locus, or downstream of said downstream edge; whereby flow of the reaction gas over the substrates is close to a laminar flow.