Formation of antifuse structure in a three dimensional memory
First Claim
1. A method of forming a memory comprising:
- forming a first plurality of spaced apart rail-stacks having a top semiconductor film;
forming a dielectric film having a top surface between said plurality of first rail-stacks;
etching said semiconductor film of said first plurality of spaced apart rail-stacks so that said semiconductor film is recessed below said top surface of said dielectric film;
forming an antifuse material on said etched semiconductor film of said first plurality of spaced apart rail-stacks; and
forming a second plurality of spaced apart rail-stacks on said antifuse material, said second plurality of spaced apart rail-stacks having a lower semiconductor film on said antifuse material.
13 Assignments
0 Petitions
Accused Products
Abstract
The present invention is directed to novel antifuse arrays and their methods of fabrication. According to an embodiment of the present invention an array comprises a plurality of first spaced apart rail-stacks having a top semiconductor material. A fill dielectric is located between the first plurality of spaced apart rail-stacks wherein the fill dielectric extends above the top surface of the semiconductor material. An antifuse material is formed on the top of the semiconductor material of the first plurality of spaced apart rail-stacks. A second plurality of spaced apart rail-stacks having a lower semiconductor material is formed on the antifuse material.
In the second embodiment of the present invention the array comprises a first plurality of spaced apart rail-stacks having a top semiconductor material. A fill dielectric is located between the first plurality of spaced apart rail-stacks wherein the fill dielectric is recessed below the top surface of the semiconductor material. An antifuse material is formed on the top semiconductor material of the first plurality of spaced apart rail-stacks. A second plurality of spaced apart rail-stacks having a lower semiconductor film is formed on the antifuse material.
-
Citations
58 Claims
-
1. A method of forming a memory comprising:
-
forming a first plurality of spaced apart rail-stacks having a top semiconductor film;
forming a dielectric film having a top surface between said plurality of first rail-stacks;
etching said semiconductor film of said first plurality of spaced apart rail-stacks so that said semiconductor film is recessed below said top surface of said dielectric film;
forming an antifuse material on said etched semiconductor film of said first plurality of spaced apart rail-stacks; and
forming a second plurality of spaced apart rail-stacks on said antifuse material, said second plurality of spaced apart rail-stacks having a lower semiconductor film on said antifuse material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method of forming a memory comprising:
-
forming a first plurality of spaced apart rail-stacks having a top semiconductor film;
forming a dielectric film between said first plurality of spaced apart rail-stacks;
etching said dielectric film below the top surface of said semiconductor material of said first plurality of spaced apart rail-stacks to form a convex corner at the top edge of said semiconductor material;
forming an antifuse material on and over said corner of said semiconductor material of said first plurality of spaced apart rail-stacks; and
forming a second plurality of spaced apart rail-stacks on said antifuse material, said second plurality of spaced apart rail-stacks having a lower semiconductor film on said antifuse material. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A method for fabricating a three-dimensional array comprising:
-
forming a silicon layer having an upper surface;
forming a masking layer over the silicon layer;
patterning the masking layer;
etching at least the silicon layer in alignment with the patterned masking layer to define memory array features, the features having an upper surface;
filling between the features with a dielectric material which is softer than the masking layer to a level below the upper surface of the features;
planarizing the dielectric material with the masking layer acting as a stop;
removing the patterned masking layer; and
forming an antifuse layer on the upper surface of the features such that the features protrude into the antifuse layer. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
-
33. A method for fabricating a three-dimensional array comprising:
-
forming a silicon layer having an upper surface;
forming a masking layer over the silicon layer, the masking layer having a lower surface in contact with the upper surface of the silicon layer;
patterning the masking layer;
etching at least the silicon layer in alignment with the patterned masking layer to define memory array features, each of the features having an upper surface;
filling between the features with a dielectric material which is softer than the masking layer to a level above the upper surface of the features;
planarizing the dielectric material with the masking layer acting as a stop;
removing the patterned masking layer;
forming an antifuse layer on the upper surface of the features such that the antifuse layer has recessions. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
-
-
43. A method for forming a three-dimensional memory array comprising:
-
forming a masking layer on an upper surface of a silicon layer;
forming memory features from the silicon layer using the masking layer;
filling spaces between the memory features with a filling material which etches more quickly than the masking layer, to a level below the upper surface of the silicon layer;
planarizing the filling material using the masking layer as an etchant stop;
removing the masking layer;
forming an antifuse layer on the memory features, such that the antifuse layer is thinner at the edges of the features than midway between the edges of the features. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51)
-
-
52. A method for fabricating a three-dimensional memory array comprising:
-
forming a polysilicon layer;
forming a masking layer having an upper silicon nitride layer and a lower silicon dioxide layer over the polysilicon layer on an upper surface of the polysilicon layer;
patterning the masking layer;
etching at least the polysilicon layer in alignment with the patterned masking layer to define parallel, spaced-apart memory lines;
filling spaces between the memory lines with a dielectric material which polishes more readily than silicon nitride to a level below the upper surface of the polysilicon memory lines;
polishing the dielectric material with the silicon nitride layer acting as a polish stop;
removing the silicon nitride layer;
forming a silicon dioxide layer over the polysilicon lines such that the silicon dioxide layer is thinner at the edges of the lines than at the center of the lines. - View Dependent Claims (53, 54, 55, 56, 57, 58)
-
Specification