Memory Cell Layout With Etch Stop to Prevent Source Line Bridging
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Solution Overview
Problem
In the manufacturing of memory devices, the distance between the source line and the discharge contact needs to be precisely controlled to avoid bridging or excessive device size.
Innovation Solution
The memory device includes a discharge contact, a source line spaced apart from the discharge contact, an etch stop pattern between them, and sub-support patterns on the source line and etch stop pattern, which helps maintain a sufficient margin between the source line and the discharge contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between the source line and the discharge contact is shortened, then the size of the memory device is reduced, but a bridge may occur between the source line and the discharge contact
Solution Approach 1:
An etch stop pattern is introduced as an intermediary structure positioned between the source line and the discharge contact. This etch stop pattern serves as a physical barrier and reference structure that prevents direct contact (bridging) between the source line and discharge contact while allowing the overall distance between them to be minimized for compact device size.
2Reliability
If the distance between the source line and the discharge contact is lengthened, then bridge occurrence is prevented, but the size of the memory device increases
Solution Approach 1:
The etch stop pattern acts as a mediator structure that provides the necessary separation distance for reliable operation while occupying minimal space. By positioning the etch stop pattern strategically between the source line and discharge contact, the design achieves adequate spacing for bridge prevention without proportionally increasing the overall device footprint.
Solution Approach 2:
The etch stop pattern is positioned locally at the critical interface region between the source line and discharge contact, providing enhanced reliability specifically where needed. This localized structure allows the rest of the device to maintain compact dimensions while the critical separation zone ensures bridge prevention.
3Reliability
If the distance between the source line and the discharge contact is precisely controlled, then manufacturing complexity increases, but bridge occurrence and size increase can be avoided
Solution Approach 1:
The etch stop pattern is formed in advance during the manufacturing process as a pre-established reference structure. This preliminary action provides a fixed positional reference that guides subsequent processing steps, thereby simplifying the control of distances between the source line and discharge contact without requiring complex real-time measurements or adjustments.
Solution Approach 2:
The patent replaces complex mechanical measurement and control systems with a lithographically-defined etch stop pattern structure. Instead of relying on precise mechanical positioning and measurement during manufacturing, the desired spacing is encoded in the physical dimensions of the etch stop pattern, which can be controlled through standard lithographic processes.
Data Source
AI summary
A memory device and a manufacturing method of the memory device are provided. The memory device includes a discharge contact; a source line adjacent to and spaced apart from the discharge contact; an etch stop pattern located between the discharge contact and the source line, the etch stop pattern being closer to the source line than the discharge contact; and a sub-support pattern located on the source line and the etch stop pattern.