Through-silicon via and fabrication method thereof

摘要

A through silicon via (TSV) structure including a semiconductor substrate; a first inter-metal dielectric (IMD) layer on the semiconductor substrate; a cap layer overlying the IMD layer; a conductive layer extending through the cap layer, the first IMD layer and into the semiconductor substrate; a tungsten film capping a top surface of the conductive layer; a second IMD layer overlying the cap layer and covering the tungsten film; and an interconnect feature in the second IMD layer.