Semiconductor Conductive Land for Alignment Deviation Compensation
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Solution Overview
Problem
Current semiconductor devices face challenges in reducing the LSI area due to increased margins required for alignment deviations and rounding, which hinder the improvement of patterning accuracy and integration density as process rules become finer.
Innovation Solution
The semiconductor device employs a conductive land to establish electrical connection between the conductive pattern and section, eliminating the need for margins to compensate for alignment deviations and rounding, thereby simplifying the pattern shape and enhancing integration density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If margins are increased to compensate for alignment deviations and rounding, then reliability of electrical connection is improved, but LSI area increases
Solution Approach 1:
A conductive land is introduced as an intermediary element between the conductive pattern and conductive section. This land acts as a mediator that absorbs alignment deviations and rounding effects, ensuring reliable electrical connection without requiring large margins in the critical pattern dimensions. The conductive land provides a larger, more tolerant connection area that compensates for patterning inaccuracies.
Solution Approach 2:
The connection structure is divided into separate functional elements: a conductive pattern, a conductive land, and a conductive section. By segmenting the connection path, the design allows each element to be optimized independently - the pattern for its primary function, the land for alignment tolerance, and the section for electrical connection, thereby reducing total area while maintaining reliability.
2Ease of manufacture
If margins are increased to compensate for alignment deviations, then manufacturing robustness is improved, but patterning accuracy improvement is hindered
Solution Approach 1:
The conductive land serves as a buffer zone that decouples the critical patterning dimensions from the alignment tolerance requirements. This intermediary structure allows the pattern to be formed with higher precision while the land absorbs the alignment variations, enabling both improved patterning accuracy and manufacturing robustness.
Solution Approach 2:
The solution moves the tolerance compensation from the two-dimensional pattern plane to a three-dimensional structure by adding the conductive land as a separate layer element. This dimensional transition allows alignment deviations to be compensated in the vertical stacking direction rather than requiring larger margins in the lateral pattern dimensions.
3Reliability
If margins are increased to compensate for rounding, then connection reliability is improved, but integration density decreases
Solution Approach 1:
The conductive land acts as a specialized intermediary that handles rounding compensation locally at connection points without affecting the dimensions of the critical conductive patterns. This localized tolerance absorption maintains high integration density while ensuring reliable connections despite rounding effects.
Solution Approach 2:
The conductive land provides enhanced connection area and tolerance only at the specific locations where electrical connections are made, rather than increasing margins throughout the entire device. This localized approach to reliability ensures connection robustness while maintaining high integration density in the overall device structure.
Data Source
AI summary
A semiconductor device includes a conductive pattern formed on a substrate, a conductive land formed to come into contact with at least part of the top surface of the conductive pattern, and a conductive section formed on the conductive land. The conductive section is electrically connected through the conductive land to the conductive pattern.