Patent ID: 8735287
Filing Date: 2014-05-27
Classification: H01L

Abstract:
1. A method of making a microelectronic unit comprising: forming a first hole extending from a rear face of a microelectronic element at least partially through a thickness of a semiconductor region of the microelectronic element towards an element contact at a front face of the microelectronic element; forming a second hole extending through the element contact, the element contact having an outer surface facing away from the microelectronic element, an inner surface opposite from the outer surface, and a wall surface extending within the element contact from the inner surface to the outer surface; lining portions of the first hole and second hole with a monolithic dielectric layer, at least a portion of the monolithic dielectric layer overlying at least a portion of the inner surfaces of the element contact; and forming a unit contact exposed at the rear face and forming an electrically conductive layer contacting the wall surface of the element contact, the electrically conductive layer coupled with the element contact.