Pattern layout to prevent split gate flash memory cell failure
First Claim
1. A semiconductor structure of a split gate flash memory cell, said semiconductor structure comprising:
- a semiconductor substrate including a first source/drain region and a second source/drain region, wherein a channel region is arranged between the first and second source/drain regions;
a select gate and a memory gate spaced between the first and second source/drain regions over the channel region, wherein the select gate extends over the channel region and terminates at a line end having a top surface being asymmetric about an axis that extends along a length of the select gate and that bisects a width of the select gate; and
a charge trapping dielectric structure arranged between neighboring sidewalls of the memory gate and the select gate, and arranged under the memory gate.
1 Assignment
0 Petitions
Accused Products
Abstract
A semiconductor structure of a split gate flash memory cell is provided. The semiconductor structure includes a semiconductor substrate including a first source/drain region and a second source/drain region. The first and second source/drain regions form a channel region therebetween. The semiconductor structure further includes a select gate and a memory gate spaced between the first and second source/drain regions over the channel region. The select gate extends over the channel region and terminates at a line end having a top surface asymmetric about an axis that extends along a length of the select gate and that bisects a width of the select gate. Even more, the semiconductor structure includes a charge trapping dielectric arranged between neighboring sidewalls of the memory gate and the select gate, and arranged under the memory gate. A method of manufacturing the semiconductor structure is also provided.
4 Citations
20 Claims
-
1. A semiconductor structure of a split gate flash memory cell, said semiconductor structure comprising:
-
a semiconductor substrate including a first source/drain region and a second source/drain region, wherein a channel region is arranged between the first and second source/drain regions; a select gate and a memory gate spaced between the first and second source/drain regions over the channel region, wherein the select gate extends over the channel region and terminates at a line end having a top surface being asymmetric about an axis that extends along a length of the select gate and that bisects a width of the select gate; and a charge trapping dielectric structure arranged between neighboring sidewalls of the memory gate and the select gate, and arranged under the memory gate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A semiconductor structure of a pair of split gate flash memory cell, said semiconductor structure comprising:
-
a semiconductor substrate including channel regions arranged in rows and columns between source and drain regions; select gates individual to the rows and extending across and perpendicular to the channel regions of corresponding rows, wherein the select gates terminate at corresponding line ends having top surfaces asymmetric about corresponding axes that extend along lengths of the corresponding select gates and that bisect widths of the corresponding select gates; memory gates corresponding to the select gates and spaced from the corresponding select gates between corresponding source and drain regions; and charge trapping dielectric structures corresponding to the memory gates that are arranged between the corresponding memory gates and the select gates, and that are arranged under the corresponding memory gates. - View Dependent Claims (11, 12, 13, 14, 15)
-
-
16. A semiconductor structure comprising:
-
a semiconductor substrate including a first source/drain region and a second source/drain region, wherein a channel region is arranged between the first and second source/drain regions; and a select gate and a memory gate spaced between the first and second source/drain regions, wherein the select gate extends over the channel region and terminates at a line end having a top surface being asymmetric about an axis that extends along a length of the select gate and that bisects a width of the select gate, and wherein the select gate extends to the line end perpendicular to a length of the channel region. - View Dependent Claims (17, 18, 19, 20)
-
Specification