Semiconductor Interconnect Reticle Selection for Misalignment Compensation
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Solution Overview
Problem
As semiconductor devices are scaled down, the deterioration of operating characteristics due to misalignment between conductive structures in MOSFETs poses a challenge in maintaining improved electrical properties.
Innovation Solution
A method is introduced that involves forming first and second conductive structures, measuring misalignment values, and selecting a reticle from a set to form a connection conductive structure that electrically connects these structures, with the connection structure's design varying based on the measured misalignment to ensure effective alignment and electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conductive structures are formed in scaled-down semiconductor devices, then device integration is improved, but misalignment between conductive structures deteriorates manufacturing precision
Solution Approach 1:
The patent applies preliminary action by forming a preliminary conductive structure before the main conductive structure. This preliminary structure serves as a buffer that can absorb misalignment, ensuring that the final electrical connection is maintained even when alignment varies within a certain range. The preliminary conductive structure is formed in advance to compensate for potential positioning errors in subsequent fabrication steps.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the position and dimensions of the connection conductive structure based on the measured misalignment value. When misalignment is detected, the connection conductive structure is repositioned or resized to bridge the gap between misaligned conductive structures, thereby maintaining electrical connectivity despite variations in alignment parameters.
2Device complexity
If misalignment between conductive structures occurs, then manufacturing complexity increases, but electrical connectivity reliability deteriorates
Solution Approach 1:
The patent introduces an intermediary element - the connection conductive structure - that mediates between misaligned conductive structures. This connection structure acts as a bridge that can adapt to misalignment, ensuring reliable electrical connectivity. The intermediary structure absorbs the mismatch and maintains the electrical pathway, preventing complete connection failure.
Solution Approach 2:
The preliminary conductive structure is formed in advance as a compensatory measure. This preliminary structure is positioned to overlap with the main conductive structure, creating a buffer zone that can accommodate misalignment. By preparing this preliminary structure beforehand, the patent ensures that even if alignment varies, the electrical connection can be maintained through the preliminary structure.
3Reliability
If connection conductive structure is formed to compensate for misalignment, then electrical properties are improved, but manufacturing process steps increase
Solution Approach 1:
The preliminary conductive structure is formed as part of the standard fabrication process flow, integrating the compensation mechanism into existing manufacturing steps rather than adding entirely separate processes. This allows the patent to maintain improved electrical properties while minimizing the increase in manufacturing complexity by embedding the solution within the conventional fabrication sequence.
Data Source
AI summary
Disclosed is a semiconductor fabrication method comprising forming a first conductive structure and a second conductive structure, measuring a misalignment value between the first conductive structure and the second conductive structure, based on the measured misalignment value selecting a reticle from a set of reticles, and using the selected reticle to form a connection conductive structure that electrically connects the first conductive structure to the second conductive structure.