Patent ID: 7144778
Filing Date: 2006-12-05
Classification: G11C,H01L

Abstract:
1. A method of forming a semiconductor memory cell, comprising the steps of: forming a first region in a semiconductor substrate, wherein the substrate has a first conductivity type and the first region has a second conductivity type; forming a trench into a surface of the semiconductor substrate, wherein the trench is spaced apart from the first region; forming a second region in the substrate and underneath the trench, wherein the second region has the second conductivity type and a channel region in the substrate is defined between the first and second regions, the channel region includes a first portion that extends substantially along a sidewall of the trench and a second portion that extends substantially along the substrate surface; forming a block of conductive material disposed over the first region; forming a floating gate of electrically conductive material disposed over and insulated from at least a portion of the channel region, and disposed laterally adjacent to and insulated from the block of conductive material; and forming a control gate of electrically conductive material having a first portion disposed in the trench.