Abstract: A semiconductor memory cell includes a floating body region configured to be charged to a level indicative of a state of the memory cell. A first region is in electrical contact with the floating body region. A second region is in electrical contact with the floating body region and is spaced apart from the first region. A gate is positioned between the first and second regions. A buried layer is provided beneath the floating body region. An insulating layer is configured to insulate the memory cell from adjacent memory cells in a first direction. A buried insulating layer is configured to insulate the memory cell from adjacent memory cells in a second direction perpendicular to the first direction.