Patent ID: 7439131
Filing Date: 2008-10-21
Classification: H01L

Abstract:
1. A method of forming a flash memory device having a resistivity measurement pattern, the method comprising: forming a first trench in a semiconductor substrate on which a screen oxide film and a pad nitride film are stacked and forming an isolation film in the first trench to define an active region; forming a second trench in the isolation film; removing the pad nitride film and the screen oxide film to expose the semiconductor substrate of the active region; forming a tunnel oxide film on the semiconductor substrate of the active region, forming a floating gate on the tunnel oxide film and then forming a resistivity measurement floating gate in the second trench; forming a dielectric film on the entire surface; forming a control gate pattern on a predetermined region of the resistivity measurement floating gate and forming a control gate on the floating gate; forming an interlayer insulation film on the entire surface; and forming resistivity measurement contacts, which are connected to the resistivity measurement floating gate through the interlayer insulation film, at both sides of the control gate pattern.