Variable Resistance Memory Capping Pattern Prevents Leaning
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Solution Overview
Problem
Existing semiconductor memory devices face issues with leaning and bridging during the patterning process, which affect the reliability and performance of variable resistance memory devices.
Innovation Solution
The implementation of a variable resistance memory device design that includes a specific structure of conductive lines, buried structures, and cell structures, with a capping pattern that covers the liner and filling patterns, preventing leaning and bridging by ensuring the capping pattern's etching resistance is greater than the filling pattern's, thus stabilizing the cell structures during fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a variable resistance memory device is fabricated using conventional patterning processes, then manufacturing complexity is reduced, but leaning and bridging occur during patterning, degrading manufacturing precision and reliability
Solution Approach 1:
The patent applies preliminary action by forming a capping pattern over the filling pattern and liner pattern before the main patterning process. This capping pattern serves as a protective structure that prevents leaning and bridging during subsequent etching and patterning operations. The capping pattern is formed in advance to establish structural integrity before critical patterning steps occur.
Solution Approach 2:
The capping pattern acts as an intermediary structure between the filling pattern and the external environment during patterning. It mediates the etching process by providing a protective layer that prevents direct exposure of the filling pattern to etchants, thereby preventing leaning and bridging while allowing controlled access to underlying structures where needed.
2Reliability
If the capping pattern's etching resistance is made greater than the filling pattern's, then leaning and bridging are prevented, but device complexity increases
Solution Approach 1:
The patent applies local quality by creating a capping pattern with locally enhanced etching resistance properties. The capping pattern is formed with different material composition or structure than the filling pattern, giving it superior etching resistance specifically where needed to prevent leaning and bridging. This localized property enhancement targets the specific problem area without requiring overall device complexity increase.
Data Source
AI summary
A variable resistance memory device includes first conductive lines, second conductive lines arranged on the first conductive lines, first cell structures at intersections between the first conductive lines and the second conductive lines, each first cell structure including a switching pattern and a variable resistance pattern, first buried structures filling first trenches between the first conductive lines, and second buried structures filling second trenches between the first cell structures. Each first buried structure includes a first liner pattern covering sidewalls of a corresponding first trench, a first filling pattern being disposed on the first liner pattern and in the corresponding first trench, and a first capping pattern sealing the corresponding first trench. The second buried structures extend in the plurality of second trenches and are connected with first capping patterns of the first buried structures.