Patent ID: 8796828
Filing Date: 2014-08-05
Classification: H01L

Abstract:
1. A method of fabricating a microelectronic unit, comprising: removing material from a substrate having a CTE less than 10 ppm/° C. to form a hole extending from a major surface of the substrate to a second surface opposite the major surface; forming an electrically conductive element having a joining portion extending above and supported on the major surface, an anchor portion fixed relative to the substrate, and a connecting portion extending downwardly from the joining portion to the anchor portion, a surface of the connecting portion having a contour conforming to a contour of an inner surface of the hole; removing material supporting at least a joining portion of the conductive element from the major surface to form a recess such that the joining portion at least partially overlies the recess, and such that the contour of the surface of the connecting portion does not conform to a contour of an inner surface of the recess; and depositing a material within the recess having a modulus of elasticity less than 10 GPa, wherein the joining portion is at least partially exposed at the major surface of the substrate for connection to a component external to the microelectronic unit.