3D Memory Staircase Channels That Prevent Pillar Isolation
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Solution Overview
Problem
The existing memory devices face challenges in reducing the physical area occupied by staircase structures in 3D memory arrays, which limits the inclusion of additional memory levels and increases the physical area, leading to reduced storage capacity and wasted space due to electrical isolation of conductive pillars during the bisecting process.
Innovation Solution
The use of a deposited barrier material, such as nitride, in the bisected channels of the staircase region, with one side implanted with carbon, prevents trench formation and allows for proper bisection while maintaining access to word lines at each level, thereby increasing storage capacity without expanding the physical area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If channels in the staircase region are bisected to reduce the staircase region area, then the storage capacity increases, but conductive pillars become electrically isolated from word lines due to trench formation
Solution Approach 1:
A barrier material is deposited in the channel before bisection to prevent trench formation that would isolate conductive pillars. This preliminary protective action ensures that when the channel is bisected to increase storage capacity, the conductive pillars remain electrically connected to word lines without being isolated by trenches.
Solution Approach 2:
The barrier material acts as an intermediary substance between the etching process and the conductive pillar. It prevents the harmful interaction (trench formation) while allowing the beneficial action (channel bisection for increased capacity) to proceed.
2Productivity
If the staircase region area is reduced by bisecting channels, then more memory levels can be included, but the physical area increases due to trench formation
Solution Approach 1:
The barrier material is deposited beforehand to counteract the harmful effect of trench formation during channel bisection. This prevents the physical area from increasing while allowing the channel bisection to proceed for including more memory levels.
3Quantity of substance
If channels are bisected to increase storage capacity, then more memory cells can be accessed, but conductive pillars become uncoupled from word lines
Solution Approach 1:
The barrier material is deposited in the channel before the bisection process to ensure that when the channel is divided, the conductive pillars remain properly coupled to word lines. This preliminary protective measure simplifies the manufacturing process by preventing electrical isolation issues.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables increased storage capacity in memory devices by preventing trench formation during the bisection of channels, ensuring that conductive pillars remain coupled with word lines, thus enhancing memory storage density without increasing the physical area occupied by the staircase region.
Implementation Method 1
a deposited barrier material, such as nitride, in the bisected channels of the staircase region, with one side implanted with carbon
Data Source
AI summary
Methods, systems, and devices for staircase structures for accessing three-dimensional (3D) memory arrays are described. A memory system may include an access region (e.g., a staircase region) that includes circuitry for accessing memory cells at respective levels of memory cells. The access region may include a channel through which a conductive pillar may couple a word line at a level of memory cells with decoder circuitry. During manufacture of the memory system, a channel material may be formed in the channel and etched to form a corner portion in the channel. During a partitioning of the channel, a nitride material over the corner portion may be etched and some of the corner portion may remain in the channel, which may prevent formation of a trench that may cause the conductive pillar to be uncoupled from the word line.