Patent ID: 8815681
Filing Date: 2014-08-26
Classification: H01L

Abstract:
1. A method of forming a nonvolatile memory device, comprising: providing a semiconductor substrate including a plurality of first regions and a plurality of second regions extending in a first direction, the plurality of first regions and the plurality of second regions being alternately disposed along a second direction crossing the first direction; forming a plurality bulk regions doped with a dopant of a second conductivity type and a plurality of device isolation patterns disposed along a second direction crossing the first direction, the bulk regions and the device isolation patterns being formed in the second regions; forming a plurality of buried doped lines each in one of the first regions and extending in the first direction, the plurality of buried doped lines being doped with a dopant of a first conductivity type; forming a plurality of word lines crossing the plurality of buried doped lines and the plurality of bulk regions, the plurality of word lines being parallel to one another; and forming a plurality of contact structures connected to the plurality of buried doped lines, the plurality of contact structures being between the plurality of device isolation patterns, wherein the plurality of word lines directly adjacent to the plurality of contact structures include gate electrodes, and side walls of the device isolation patterns disposed in the first direction overlap with the gate electrodes, and wherein a bottom surface of the plurality of device isolation patterns is lower than a top surface of the semiconductor substrate.