Model-Based Fill for IC Material Thickness Control
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Solution Overview
Problem
Conventional planarization methods in integrated circuit manufacturing result in uneven surfaces due to differing material densities, leading to unpredictable material thickness and potential manufacturing defects, as they do not account for the perimeter-to-area ratio of geometric elements in the circuit layout design.
Innovation Solution
The method involves dividing the circuit layer into tiles, analyzing each for pattern density, and using a thickness estimation model or lookup table to determine necessary fill geometric elements to achieve a target thickness range, considering both density and perimeter-to-area ratio, to ensure accurate material thickness and surface planarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional planarization methods are used to polish material layers, then the manufacturing process is simple and fast, but the surface becomes uneven and material thickness becomes unpredictable
Solution Approach 1:
The patent applies preliminary action by adding fill geometric elements to the circuit layout design before the manufacturing process begins. This pre-adjustment of pattern density ensures that the material layer achieves the desired thickness and surface planarity during manufacturing, eliminating the need for complex post-manufacturing corrections and resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent employs parameter changes by modifying the pattern density parameter of the circuit layout design. By adjusting the density of geometric elements and adding fill elements strategically, the design changes the effective material distribution parameters to achieve uniform thickness and surface planarity, thereby improving manufacturing precision without significantly increasing overall design complexity
2Manufacturing precision
If fill geometric elements are added to increase pattern density, then material thickness control improves, but manufacturing process complexity increases
Solution Approach 1:
The patent applies local quality by adding fill geometric elements selectively to specific regions of the circuit layout where pattern density is insufficient. Rather than uniformly increasing density across the entire design, the fill elements are placed locally in target areas to achieve the desired surface planarity and thickness control, thereby improving manufacturing precision while minimizing the increase in manufacturing process complexity
3Manufacturing precision
If pattern density is increased to control material thickness, then thickness predictability improves, but capacitance of material layers increases
Solution Approach 1:
The patent employs parameter changes by optimizing the pattern density parameter through controlled addition of fill geometric elements. By carefully adjusting the density to achieve the minimum required level for thickness predictability, rather than maximizing density, the patent achieves the desired thickness control while minimizing the increase in material capacitance, thus resolving the contradiction between thickness predictability and quantity of substance
Data Source
AI summary
Various aspects of this disclosure relate to increasing pattern density in a circuit layout design of a circuit layer so as to control the thickness of material in a manufactured integrated circuit. For example, a layer in circuit design may be divided into separate areas, and a target thickness range may be established for all of the tiles in the integrated circuit design. Each area may be analyzed to determine if it has a sufficient pattern density for a thickness estimation model to accurately estimate its expected material thickness upon manufacture. Each tile may be analyzed to determine if the expected thickness for that tile is within the target thickness range.