Silicon Gapfill Expansion for Void-Free High-Aspect Features
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Solution Overview
Problem
Conventional semiconductor processing methods struggle to fill high aspect ratio features without forming voids or seams, leading to structural flaws and defects in integrated circuits.
Innovation Solution
A method involving the deposition of a silicon-containing material followed by annealing with an oxygen-containing precursor to expand the film, reducing or eliminating voids and seams, and iteratively filling the features to achieve complete coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional deposition methods are used to fill high aspect ratio features, then the features can be filled with material, but voids or seams form in the deposited material
Solution Approach 1:
The patent applies preliminary action by performing an annealing treatment on the deposited silicon-containing material before completing the fill process. This pre-treatment causes controlled expansion of the material to prevent void or seam formation during subsequent deposition steps, thereby ensuring structural integrity while maintaining fill quality
Solution Approach 2:
The patent changes physical parameters by heating the substrate to temperatures between 300-700°C during annealing, which induces volumetric expansion of the silicon-containing material. This parameter change transforms the material's physical state to eliminate voids and seams, resolving the contradiction between fill quality and structural integrity
2Productivity
If device sizes are reduced to continue scaling, then more advanced integrated circuits can be produced, but voids or seams become more difficult to control
Solution Approach 1:
The patent implements preliminary action by introducing an annealing step that expands the deposited material to prevent void formation before subsequent deposition completes the feature fill. This proactive measure enables continued device scaling while maintaining precise void control through material expansion prior to final filling
Solution Approach 2:
The patent applies continuity of useful action by iteratively repeating the cycle of depositing silicon-containing material followed by annealing-induced expansion. This continuous iterative process ensures that void control is maintained throughout the entire fill sequence, enabling sustained device scaling with consistent manufacturing precision
3Manufacturing precision
If iterative deposition cycles are used to fill features, then complete coverage can be achieved, but the process time increases
Solution Approach 1:
The patent changes the thermal parameter by implementing annealing at elevated temperatures (300-700°C) that cause volumetric expansion of the deposited material. This parameter change accelerates the void elimination process during iterative cycles, maintaining complete feature fill coverage while reducing the time penalty associated with multiple deposition steps
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 method effectively reduces or eliminates voids and seams, ensuring high-quality semiconductor structures by minimizing defects and enabling seamless integration processes.
Implementation Method 1
The annealing may cause the silicon-containing material to expand within the one or more features
Implementation Method 2
annealing the silicon-containing material with the oxygen-containing precursor
Data Source
AI summary
Exemplary methods of semiconductor processing may include providing a silicon-containing precursor to a processing region of a semiconductor processing chamber. A substrate may be disposed within the processing region of the semiconductor processing chamber. The substrate may define one or more features along the substrate. The methods may include depositing a silicon-containing material on the substrate. The silicon-containing material may extend within the one or more features along the substrate. The methods may include providing an oxygen-containing precursor. The methods may include annealing the silicon-containing material with the oxygen-containing precursor. The annealing may cause the silicon-containing material to expand within the one or more features. The methods may include repeating one or more of the operations to iteratively fill the one or more features on the substrate.