Non-volatile storage element and manufacturing method thereof
View Patent ↗A non-volatile storage element 100 has a silicon substrate 102 , a first memory region 106 a composed of a first lower silicon oxide film 108 a , a first silicon nitride film 110 a , and a first upper layer silicon oxide film 112 a provided in this order, a second memory region 106 b composed of a second lower layer silicon oxide film 108 b , a second silicon nitride film 110 b , and a second upper layer silicon oxide film 112 b provided in this order, and a first control gate 114 and a second control gate 116 arranged on the first memory region 106 a and the second control gate 116 , respectively, on the silicon substrate 102 . The silicon nitride film 110 is provided so as to be horizontal in a direction within a substrate plane.
1. A nonvolatile storage element, comprising:
a semiconductor substrate;
a memory region provided on said semiconductor substrate in the order of a first insulating film, an electron trapping film, and a second insulating film, an entirety of said electron trapping film being coplanar and parallel to a substrate plane direction; and
a first control gate and a second control gate arranged next to each other on said memory region,
wherein said electron trapping film is comprised of a first electron trapping film formed below said first control gate, and a second electron trapping film formed below said second control gate and provided distanced from said first electron trapping film, and
wherein an end part of at least one of said first electron trapping film and said second electron trapping film is positioned at the inside of an end part of said first control gate and said second control gate, respectively, in a cross-section in a gate length direction.
2. A nonvolatile storage element, comprising:
a semiconductor substrate;
a memory region provided on said semiconductor substrate in the order of a first insulating film, an electron trapping film, and a second insulating film, an entirety of said electron trapping film being coplanar and parallel to a substrate plane direction; and
a first control gate and a second control gate arranged next to each other on said memory region,
wherein said electron trapping film is formed so as to be continuous so as to span from below said first control gate to below said second control gate, and
wherein said electron trapping film is provided in such a manner that at least one end part is positioned at the inside of an end part of a region spanning from a region right under said first control gate to a region right under said second control gate in a cross-section in a gate length direction.