Patent ID: 7176109
Filing Date: 2007-02-13
Classification: H01L

Abstract:
1. A method of forming a vertical structure on a substrate, comprising the steps of: selectively growing a first epitaxial layer of monocrystalline silicon on the substrate; the first epitaxial layer comprising sidewalls and a top surface; forming a layer of an insulative material over the sidewalls and the top surface of the first epitaxial layer; removing a portion of the insulative layer to form insulative spacers over the sidewalls and expose the top surface of the first epitaxial layer; selectively growing a second epitaxial layer of monocrystalline silicon on the exposed surface of the first epitaxial layer, the second epitaxial layer comprising sidewalls and a top surface; and forming a layer of an insulative material over the sidewalls and the top surface of the second epitaxial layer.