Semiconductor memory device and method for forming the same
First Claim
1. A semiconductor memory device comprising:
- a substrate defined with a first cell region, a slimming region extending from the first cell region in a first direction and a second cell region extending from the slimming region in the first direction;
first and second electrode structures each including a plurality of electrodes which are stacked on the substrate, and disposed to be separated from each other in a second direction crossing with the first direction, with a slit interposed therebetween; and
a plurality of step-shaped holes disposed in the slimming region along the first direction, and respectively formed in the first and second electrode structures,wherein each of the step-shaped holes includes first step structures which face each other in the first direction, are symmetrical to each other and are separated by the slit and second step structures which face each other in the second direction and are symmetrical to each other.
1 Assignment
0 Petitions
Accused Products
Abstract
A semiconductor memory device includes a substrate defined with a first cell region, a slimming region extending from the first cell region in a first direction and a second cell region extending from the slimming region in the first direction; first and second electrode structures each including electrodes which are stacked on the substrate, and disposed to be separated from each other in a second direction crossing with the first direction, with a slit interposed therebetween; and a plurality of step-shaped holes disposed in the slimming region along the first direction, and respectively formed in the first and second electrode structures. Each of the step-shaped holes includes first step structures which face each other in the first direction, are symmetrical to each other and are separated by the slit and second step structures which face each other in the second direction and are symmetrical to each other.
-
Citations
20 Claims
-
1. A semiconductor memory device comprising:
-
a substrate defined with a first cell region, a slimming region extending from the first cell region in a first direction and a second cell region extending from the slimming region in the first direction; first and second electrode structures each including a plurality of electrodes which are stacked on the substrate, and disposed to be separated from each other in a second direction crossing with the first direction, with a slit interposed therebetween; and a plurality of step-shaped holes disposed in the slimming region along the first direction, and respectively formed in the first and second electrode structures, wherein each of the step-shaped holes includes first step structures which face each other in the first direction, are symmetrical to each other and are separated by the slit and second step structures which face each other in the second direction and are symmetrical to each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method for forming a semiconductor memory device, comprising:
-
forming a stack by alternately stacking first and second material layers on a substrate including a first cell region, a slimming region extending from the first cell region in a first direction and a second cell region extending from the slimming region in the first direction; forming a hole type mask pattern having first opening holes which are disposed in a line along the first direction, on the stack; forming first step-shaped holes each including a pair of first step structures which face each other in the first direction and are symmetrical to each other and a pair of second step structures which face each other in a second direction crossing with the first direction and are symmetrical to each other, by etching the stack through a pad etching process using the hole type mask pattern as an etch barrier; forming a second step-shaped hole by etching the stack such that at least one of the first step-shaped holes is recessed; and dividing the stack by forming a slit which traverses the first and second step-shaped holes in the first direction, in the stack. - View Dependent Claims (14, 15, 16, 17, 18, 19)
-
-
20. A semiconductor memory device, comprising a substrate;
-
a stack of alternating first and second material layers on the substrate including a first cell region, a slimming region extending from the first cell region in a first direction and a second cell region extending from the slimming region in the first direction; first and second step-shaped holes penetrating the stack at least partially in a third direction, each of the first and second step-shaped holes including a pair of first step structures which face each other in the first direction and are symmetrical to each other and a pair of second step structures which face each other in a second direction crossing with the first direction and are symmetrical to each other; a slit which divides the stack and traverses the first and second step-shaped holes in the first direction, and first and second step-shaped trenches each traversing the entire stack in the second direction and intersecting with the first and second step-shaped holes, respectively.
-
Specification