Patent ID: 8310036
Filing Date: 2012-11-13
Classification: H01L,H04N

Abstract:
1. A microelectronic unit, comprising: a semiconductor chip having a front surface and a rear surface remote from the front surface, a microelectronic device having an active semiconductor region in a region of semiconductor material below the front surface, a plurality of conductive pads each having a top surface exposed at the front surface and having a bottom surface remote from the top surface, the semiconductor chip having a first opening extending from the rear surface partially through the semiconductor material region towards the front surface, and a second opening meeting the first opening within the semiconductor material region and extending to a pad of the plurality of pads; a conductive via in registration with and in contact with the pad and extending within the second opening; a conductive interconnect electrically connected to the conductive via and extending away therefrom at least partly within the first opening; a conductive contact electrically connected to the conductive interconnect, the contact available for connection with an element external to the microelectronic unit, wherein the first opening has a first width in a lateral direction along the rear surface, the second opening has a second width in the lateral direction where the second opening meets the first opening, and the second opening has a third width in the lateral direction adjacent the conductive pad, the first width being greater than the second width, and the second width being greater than the third width.