Patent ID: 9147686
Filing Date: 2015-09-29
Classification: H01L

Abstract:
1. A method of forming a semiconductor device, the method comprising: forming a first transistor including a gate, and a first diffusion layer in a cell region of a semiconductor substrate, the first diffusion layer including a source region and a drain region; forming a second transistor including a second diffusion layer in a peripheral circuit region of the semiconductor substrate; forming a first contact layer comprising silicon, the first contact layer being in contact with the source region and the drain region of the first diffusion layer; and forming a metal film over the first and second transistors, the metal film being in contact with the first contact layer on the source region and the first contact layer on the drain region, the metal film being in contact with the second diffusion layer; patterning the metal film to form a first contact plug being in contact with the first contact layer and a second contact plug being in contact with the second diffusion layer; and forming a first suicide layer between the first contact layer and the first contact plug and a second silicide layer between the second diffusion layer and the second contact plug.