Patent ID: 6616870
Filing Date: 2003-09-09
Classification: C23C

Abstract:
A method for preparing high aspect ratio domes comprising:(a) providing at least one male mandrel in a chemical vapor deposition chamber such that the at least one male mandrel is oriented in the deposition chamber at a distal position to reactant flow pathways and convection current pathways such that a flow of reactants and convection currents in the deposition chamber do not impinge on the mandrel, (b) generating the reactants as gases from a source of reactants, (c) passing the gas reactants through the deposition chamber and past the mandrel such that the flow of gas reactants does not impinge on the mandrel; and (d) depositing the gas reactants on the at least one mandrel by diffusion to form at least one dome with an aspect ratio of greater than 0.1.