Patent ID: 7687845
Filing Date: 2010-03-30
Classification: G11C,H01L

Abstract:
1. A nonvolatile semiconductor storage device, comprising: a plurality of element isolation regions formed in a semiconductor substrate and extending in a first direction; an element formation region formed between the plurality of element isolation regions; a pair of semiconductor regions to be a source and a drain formed in the element formation region; a first gate electrode extending in a second direction which intersects with the first direction; a second gate electrode extending in the second direction; and a charge trapping layer formed between the semiconductor substrate and the first gate electrode, wherein the first gate electrode is adjacent to the second gate electrode in the first direction, wherein the first gate electrode and the second gate electrode are formed between the pair of semiconductor regions, wherein the charge trapping layer is formed only in a region where the element formation region and the first gate electrode intersect, wherein information is written or erased by injecting hot electrons or hot holes into the charge trapping layer, and wherein capacitance per unit area in opposed surfaces of the first gate electrode and the second gate electrode in the element isolation region is smaller than a capacitance per unit area in opposed surfaces of the first gate electrode and the second gate electrode in the element formation region.