Patent ID: 6891246
Filing Date: 2005-05-10
Classification: H01L

Abstract:
1. A nonvolatile semiconductor memory device comprising: a semiconductor substrate; a trench isolation provided in the semiconductor substrate, the trench isolation defining an active area at the semiconductor substrate, the active area extending in a first direction; a gate insulator provided on the active area; an interlayer insulator provided over the trench isolation and the active area, the interlayer insulator having a wiring trench, the wiring trench extending in a second direction intersecting the first direction; a first conductive material layer provided at a cross-point of the active area and the wiring trench, the first conductive material layer being insulated from the active area via the gate insulator; an inter-gate insulator provided on the first conductive layer; a second conductive material layer provided in the wiring trench, the second conductive material layer being insulated from the first conductive material layer via the inter-gate insulator; and a metal layer provided in the wiring trench, the metal layer electrically contacting the second conductive material layer, wherein a position of a top surface of the metal layer and a position of a top surface of the interlayer insulator coincide with each other.