Patent ID: 9159619
Filing Date: 2015-10-13
Classification: B81C,H01L

Abstract:
1. A method for producing an electrical feedthrough in a substrate having a front side and a back side, the method comprising: forming an etch stop layer on the front side of the substrate; forming a mask on the back side of the substrate; forming an annular trench in the substrate, which trench extends from the back side to the front side, by an etching process using the mask, the etching stops at the etch stop layer, the forming the annular trench surrounding a substrate punch; depositing a metal layer over the back side of the substrate using the mask, the metal layer penetrating into the annular trench and being deposited on the substrate punch; forming a metal silicide layer on the substrate punch by at least partially converting the metal layer into the metal silicide layer on the substrate punch; selectively removing a remainder of the metal layer; and closing off the annular trench at the back side of the substrate.