Dummy Patterns for Vertical Semiconductor Word Line Pad Monitoring
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Solution Overview
Problem
The process of forming staircase word-line pad structures in vertical-type semiconductor devices is prone to failures due to large variations in size, necessitating a new method for real-time monitoring and control of word line pad dimensions during fabrication.
Innovation Solution
Incorporating dummy patterns on the semiconductor device substrate to serve as reference lines for monitoring the critical dimensions of word line pads in real-time, both before and after etching processes, ensuring precise alignment and size consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a staircase word-line pad structure is formed in vertical-type semiconductor devices, then metal contacts can be connected on the word-line pads, but large variation in size of the word line pads occurs causing process failure
Solution Approach 1:
Dummy patterns are formed in advance before the actual word-line pad structure fabrication. These dummy patterns serve as reference standards that are measured and monitored throughout the manufacturing process to detect and correct dimensional variations in real-time, preventing process failures before they occur.
Solution Approach 2:
The dummy patterns establish a feedback mechanism where critical dimensions are monitored against predetermined reference values. Any deviations detected through measurement and inspection allow for real-time adjustments to be made during the manufacturing process, ensuring consistent word-line pad dimensions and improving overall process reliability.
2Manufacturing precision
If real-time monitoring of word line pad dimensions is implemented, then fabrication errors are reduced, but additional dummy patterns and measurement processes are required
Solution Approach 1:
Dummy patterns are created as simplified copies or replicas of the actual word-line pad structures. These dummy patterns replicate the critical geometric features and dimensions, allowing for measurement and monitoring without requiring complex measurement setups. The dummy patterns serve as stand-in references that can be easily fabricated and measured using standard processes.
Data Source
AI summary
Provided are semiconductor devices and methods of fabricating the same. The semiconductor devices may include a substrate with a cell region and a peripheral region, a gate stack including gates stacked on the cell region of the substrate. At least one edge portion of the gate stack may have a staircase structure. The semiconductor devices may also include a channel that extend through the gate stack and is enclosed by a memory layer and at least two dummy patterns on the substrate. The at least two dummy patterns may be spaced apart from the gate stack and may be spaced apart from each other.