Semiconductor Logo Interconnect Layout for Wider Process Windows
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Solution Overview
Problem
The increasing demand for smaller, faster, and more complex electronic devices has led to challenges in IC manufacturing, including complexity and reduced process windows due to scaling down of IC dimensions.
Innovation Solution
The method involves fabricating a semiconductor structure with an integrated circuit layout that includes a modified pattern for improved process windows, specifically by forming a mark pattern with dummy features in the logo region, which allows for better recognition and minimizes fabrication issues like uneven loading effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IC dimensions are scaled down to improve production efficiency and lower costs, then productivity increases, but manufacturing precision and process window deteriorate
Solution Approach 1:
The patent applies preliminary action by modifying the circuit layout pattern before fabrication to account for lithography process variations. Dummy patterns are strategically added to ensure uniform pattern density across the wafer, which pre-compensates for loading effects and ensures consistent manufacturing precision across different regions of the substrate.
Solution Approach 2:
The patent implements local quality by applying different pattern densities to different regions of the substrate. Specifically, dummy patterns are added to regions with sparse circuit layouts to achieve uniform pattern density, while regions with dense layouts maintain their original pattern density. This localized modification ensures consistent manufacturing precision across the entire wafer.
2Productivity
If IC dimensions are scaled down to improve production efficiency, then productivity increases, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the layout pattern parameters (adding dummy patterns) to optimize the manufacturing process. This changes the spatial distribution parameters of the circuit patterns to achieve uniform pattern density, which simplifies the lithography process control and reduces the complexity of process window management.
3Measurement precision
If dummy patterns are added to improve mark pattern recognition, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent implements universality by designing dummy patterns that serve multiple functions simultaneously: they improve mark pattern recognition for measurement purposes, maintain uniform pattern density to reduce loading effects, and ensure consistent lithography performance across the wafer. This multi-functionality reduces the need for separate process optimizations.
Data Source
AI summary
A substrate is provided, wherein the substrate includes a device layer, and a logo region is defined in a peripheral region of the substrate. An interconnect structure is formed over the device layer. A first conductive feature and at least one second conductive feature are formed in the interconnect structure, wherein the first conductive feature is recognizable as a first identification mark, and the at least one second conductive feature is disposed between different portions of the first conductive feature. A third conductive feature is formed at a first elevation over a second elevation of the first conductive feature, wherein the third conductive feature overlaps the first conductive feature vertically and is recognizable as a second identification mark, and a space other than the third conductive feature in the logo region at the first elevation is filled with a dielectric material.