Patent ID: 7976898
Filing Date: 2011-07-12
Classification: C23C

Abstract:
1. A method of conducting atomic layer deposition (ALD), comprising: providing a substrate in a reaction chamber; and alternately and sequentially supplying at least two ALD reactants into the reaction chamber space over the substrate in a gas flow direction parallel to the substrate, wherein the reaction space has a concave ceiling with a tubular shape such that the reaction space has a height over a center of the substrate greater than a height over edges of the substrate in a cross-sectional view perpendicular to the gas flow direction, and such that the reaction space has substantially the same height along the gas flow direction, wherein the height over the center and the height over the edges are such that a maximum gas flow over the substrate is over the center, and a minimum gas flow rate over the substrate is over the edges, and wherein gas flow rates decrease in the direction perpendicular to the gas flow direction from the maximum flow rate over the center to the minimum flow rate over the edges.