Patent ID: 7488680

Claim:
The method of making an electronic structure, comprising: providing a silicon substrate having an external surface with an opening including an external and internal sidewall and a bottom wall defining an annulus cavity with said internal sidewall forming a perimeter around a first volume of said silicon substrate; forming an insulating layer on said external and internal sidewall and said bottom wall to at least partially fill said cavity; forming an insulating layer on at least a portion of said external surface of said silicon substrate, said insulating layer including an electrically conductive structure positioned within the said perimeter of said internal sidewall; removing a portion of said substrate below said bottom wall of said cavity to expose said first volume of said silicon substrate; removing at least a portion of said first volume of silicon substrate to form an opening to said electrically conductive structure; and filling said opening with a conductive material to contact said electrically conductive structure at one end thereof.