Self-Aligned Super Via Dielectric Fill for Short Isolation
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Solution Overview
Problem
Super vias in semiconductor designs are prone to structural issues like bowing and deformation, leading to potential shorts with adjacent metallic lines due to high aspect ratios and shrinking metal pitch, which decreases device performance.
Innovation Solution
Incorporating a self-aligned dielectric fill material between the sidewalls of super vias and metallic lines, using high-k dielectric materials like aluminum oxides or hafnium oxides to insulate the super via and prevent bowing, thereby maintaining the structural integrity of the super via.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If super vias are formed with high aspect ratios to achieve superior performance, then device performance is improved, but structural stability deteriorates leading to bowing and deformation
Solution Approach 1:
A dielectric fill material is introduced as an intermediary substance between the super via structure and adjacent metallic lines. This dielectric material acts as a mediator that provides mechanical support to prevent via bowing while simultaneously providing electrical insulation to prevent shorts, thus resolving the contradiction between achieving high aspect ratio performance and maintaining structural stability.
Solution Approach 2:
The dielectric fill material is deposited into the via structure before the final metallization step. This preliminary action ensures that the structural support and insulation are in place before the via is completely formed, preventing bowing and deformation during subsequent processing steps while enabling the via to achieve its final high aspect ratio configuration.
2Productivity
If metal pitch is shrunk to increase signal wiring density, then productivity is improved, but the risk of shorts with adjacent metallic lines increases
Solution Approach 1:
The dielectric fill material serves as an intermediary insulation layer between the super via and adjacent metallic lines. This allows the metal pitch to be reduced for higher wiring density while the dielectric material maintains sufficient electrical isolation to prevent shorts, thus resolving the contradiction between increasing productivity and reducing short risk.
3Reliability
If self-aligned dielectric fill is incorporated to prevent shorts, then reliability is improved, but device complexity increases
Solution Approach 1:
The dielectric fill material is applied using a self-aligned process where the fill automatically conforms to the via structure and adjacent metallic lines. This self-service approach eliminates the need for additional alignment steps and complex patterning processes, thus achieving improved reliability through short prevention while minimizing the increase in fabrication complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The self-aligned dielectric fill effectively prevents shorts and maintains the shape of super vias, enhancing semiconductor device performance by reducing the risk of electrical shorts and ensuring consistent signal wiring.
Implementation Method 1
a dielectric fill material located between the sidewalls of the super via structure and the metallic line, wherein the dielectric fill material insulates the super via from the metallic line
Data Source
AI summary
One or more systems, devices, and/or methods of fabrication provided herein relate to isolated self-aligned super vias. According to one embodiment, a super via device can comprise a super via structure, a metallic line and a dielectric fill material located between the sidewalls of the super via structure and the metallic line.