Segmented Conductive Straps for Semiconductor Memory Reliability
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Solution Overview
Problem
The existing semiconductor structures are susceptible to breakdown or burnout during write mode due to the narrow spacing between conductive straps, which increases the resistive load and can lead to reliability issues in memory arrays.
Innovation Solution
Increasing the spacing between sections of conductive straps and optimizing the connection via structures to reduce the resistive load, allowing for a greater space S2 that avoids breakdown during write operations, and connecting conductive straps to multiple transistors in parallel to distribute the current load effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the spacing between conductive straps is reduced to increase transistor density, then the quantity of transistors per unit area increases, but the resistive load increases leading to breakdown or burnout during write operations
Solution Approach 1:
The conductive strap is divided into multiple separate sections rather than being continuous. This segmentation allows the strap to be reset between write operations, preventing cumulative resistive heating and breakdown while still maintaining high transistor density in the memory array.
Solution Approach 2:
The conductive strap sections are designed to be periodically reset to a known state after each write operation. This periodic resetting prevents the accumulation of electrical stress and heat, enabling reliable repeated write operations without breakdown or burnout.
2Reliability
If the spacing between conductive straps is increased to reduce resistive load, then write mode reliability improves, but the transistor density decreases
Solution Approach 1:
The conductive strap structure transitions from a two-dimensional planar layout to a three-dimensional structure with via holes connecting different layers. This allows the strap to serve multiple transistors in parallel across vertical layers, effectively increasing the functional density without requiring increased horizontal spacing.
Solution Approach 2:
Multiple conductive strap sections are merged through via holes to form a unified three-dimensional structure that connects to multiple transistor gates in parallel. This merging allows current distribution across multiple paths, reducing resistive load while maintaining high effective transistor density.
3Ease of manufacture
If continuous conductive straps are used to connect transistor gates, then the manufacturing process is simpler, but the resistive load causes breakdown during repeated write operations
Solution Approach 1:
The continuous conductive strap is segmented into discrete sections separated by gaps. This segmentation is achieved through standard photolithography and etching processes, making the manufacturing complexity manageable while dramatically improving reliability by allowing reset between operations.
Solution Approach 2:
Via holes serve as intermediary structures connecting the segmented conductive strap sections across different dielectric layers. These via holes enable the strap to be reset periodically while maintaining electrical connection to multiple transistor gates, solving both the reliability and manufacturing challenges.
Data Source
AI summary
The present disclosure relates to a semiconductor structure which includes a first row of diffusion strap having two sections separated by a first distance, a second row of diffusion strap having two sections separated by the first distance, a third row of diffusion strap having two sections separated by the first distance, a fourth row of diffusion strap having two sections separated by the first distance, a first row of conductive strap over the first row of diffusion strap and the second row of diffusion strap, and a second row of conductive strap over the third row of diffusion strap and the fourth row of diffusion strap. The first row of conductive strap has two sections separated by a second distance. The second row of conductive strap has having two sections separated by the second distance, wherein the second distance is greater than the first distance.