Patent ID: 8587131
Filing Date: 2013-11-19
Classification: H01L

Abstract:
1. A semiconductor structure, comprising: a semiconductor substrate; a first inter-metal dielectric (IMD) layer on the semiconductor substrate; a tungsten plug embedded in the IMD layer; a cap layer overlying the IMD layer and capping the tungsten plug; a through silicon via (TSV) comprising: a conductive layer penetrating through the cap layer, the first IMD layer and the semiconductor substrate, wherein the conductive layer has a top surface that is flush with a top surface of the cap layer; and a tungsten film capping entire said top surface of the conductive layer; a second IMD layer overlying the cap layer and covering the tungsten film; a first interconnect feature penetrating through the second IMD layer to electrically connect with the TSV; and a second interconnect feature penetrating through the second IMD layer and the cap layer to electrically connect with the tungsten plug.