International Business Machines Corporation
Metal contact isolation for semiconductor structures

Abstract:

A method of forming a semiconductor structure includes the following steps. At least a first source/drain region and a second source/drain region are formed in a substrate. At least a first sacrificial layer and a second sacrificial layer are respectively formed over the first source/drain region and the second source/drain region. A spacer layer is formed on at least a top surface of the substrate and around sides of the first sacrificial layer and the second sacrificial layer. The spacer layer includes an electrical-isolating material. The first sacrificial layer and a second sacrificial layer are removed to form a first open trench and a second open trench. The first open trench and the second open trench are filled with metal contact material to form a first metal contact and a second metal contact electrically isolated from each other by the spacer layer.