Patent ID: 8685793
Filing Date: 2014-04-01
Classification: H01L

Abstract:
1. A method of forming a stacked microelectronic assembly comprising the steps of: (a) juxtaposing a first electrically conductive element overlying a major surface of a first semiconductor element with an electrically conductive pad exposed at a front surface of a second semiconductor element, wherein the first semiconductor element has a front surface remote from the major surface, an opening extending between the front and major surfaces thereof at least partly aligned with a surface of a conductive pad exposed at the front surface of the first semiconductor element, wherein the first conductive element is electrically connected to the conductive pad of the first semiconductor element through the opening in the first semiconductor element, wherein the opening of the first semiconductor element includes a first opening extending from the major surface thereof towards the front surface thereof, and a second opening extending from the first opening to the conductive pad of the first semiconductor element, wherein where the first and second openings meet, interior surfaces of the first and second openings extend at different angles relative to the major surface of the first semiconductor element, wherein the interior surfaces of the first and second openings are lined with a dielectric layer; (b) forming an opening extending through the conductive pad of the second semiconductor element and exposing a surface of the first conductive element, wherein forming an opening includes forming a first opening extending from a major surface of the second semiconductor element towards the front surface thereof, and a second opening extending from the first opening in the second semiconductor element through the conductive pad of the second semiconductor element, wherein where the first and second openings in the second semiconductor element meet, interior surfaces of the first and second openings of the second semiconductor element extend at different angles relative to the major surface of the second semiconductor element; and (c) forming a second electrically conductive element through the conductive pad, the second conductive element extending at least within the opening in the conductive pad of the second semiconductor element and through a thickness of the second semiconductor element, the second conductive element electrically contacting the conductive pad of the second semiconductor element and the first conductive element.