Method of manufacturing MOSFET and structure thereof

摘要

A method of manufacturing an MOSFET. A substrate is provided. A trench filled with an insulating layer is formed in the substrate. The upper portion of the insulating layer is removed and then a spacer is formed on the side-wall of the trench. A sacrificial layer is formed to fill the trench. A doped semiconductive layer is formed over the substrate and then patterned to form a device region, wherein the device region spans the sacrificial layer to expose a portion of the sacrificial layer. The sacrificial layer is removed. A gate dielectric layer is formed on the exposed surface of the device region. A conductive layer is formed on the gate dielectric layer and then patterned to form a horizontal surround gate surrounding the device region. A source/drain region is formed in a portion of the substrate adjacent to the device region.