Gap Filler Agent Shrinkage Control via Controlled Ammonia Addition
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Solution Overview
Problem
Existing gap filler agents for semiconductor capacitors face challenges in achieving uniform film thickness and minimizing shrinkage during high-temperature oxidation reactions, leading to potential cracks and voids in the filler pattern.
Innovation Solution
A method involving the preparation of a gap filler agent using a halosilane and ammonia in a basic solvent, with controlled addition rates and reaction conditions to form hydrogenated polysilazane or polysiloxazane, which includes specific molecular weight and oxygen content ranges, and the use of a thermal acid generator and surfactant to enhance coating properties and reduce shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional gap filler agents are used, then the filling process can be completed, but the film thickness becomes non-uniform and shrinkage occurs during high-temperature oxidation
Solution Approach 1:
The patent modifies the chemical composition parameters of the gap filler agent by incorporating hydrogenated polysilazane with specific molecular weight (1,000-10,000) and controlled oxygen content (0.2-3 wt%). This parameter optimization prevents excessive shrinkage during high-temperature oxidation while maintaining uniform film thickness, resolving the contradiction between film uniformity and compositional stability.
Solution Approach 2:
The patent creates a composite gap filler agent system combining hydrogenated polysilazane, oxidized polysilazane, and polysiloxazane in specific ratios. This composite material approach synergistically combines the benefits of each component: hydrogenated polysilazane provides shrinkage resistance, while oxidized polysiloxazane ensures complete gap filling, achieving both uniform film thickness and compositional stability.
2Reliability
If the gap filler agent shrinks during high-temperature processing, then volume reduction occurs, but this leads to cracks and voids in the filler pattern
Solution Approach 1:
The patent optimizes the hydrogen content and molecular weight of the polysilazane component to specific ranges. This parameter control ensures that the material undergoes controlled oxidation at high temperatures without excessive volume shrinkage, preventing crack and void formation while maintaining filler pattern integrity.
Solution Approach 2:
The patent incorporates hydrogenated polysilazane as a cushioning component that compensates for volume reduction during oxidation. The hydrogenated structure acts as a buffer that maintains volume stability during high-temperature processing, preventing the formation of cracks and voids before they can occur.
3Productivity
If ammonia is added rapidly to halosilane, then the reaction proceeds quickly, but the resulting polymer has poor film uniformity and high shrinkage
Solution Approach 1:
The patent employs periodic, controlled addition of ammonia to halosilane rather than rapid continuous addition. This periodic action allows the reaction to proceed at controlled intervals, ensuring uniform polymer chain formation and preventing localized overheating or excessive crosslinking that would cause film non-uniformity and shrinkage.
Solution Approach 2:
The patent dynamically adjusts the ammonia addition rate during the polymerization process. By controlling the addition rate to match the reaction progress and heat generation, the system maintains optimal reaction conditions throughout, producing polymers with uniform structure and properties that prevent film thickness variations and shrinkage.
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 results in a gap filler agent that maintains uniform film thickness and significantly reduces shrinkage, improving the filling properties and surface flatness of semiconductor capacitors, preventing cracks and voids during high-temperature processing.
Implementation Method 1
adding a halosilane to a basic solvent, and, to the basic solvent and the halosilane, adding ammonia to thereby react the halosilane and the ammonia and prepare a gap filler agent
Implementation Method 2
the gap filler agent may be used to provide an electrode during manufacturing a semiconductor capacitor... performing the oxidation reaction at a high temperature
Data Source
AI summary
A method of preparing a gap filler agent includes adding a halosilane to a basic solvent, and, to the basic solvent and the halosilane, adding ammonia in an amount of about 50 to about 70 parts by weight based on 100 parts by weight of the halosilane at a rate of about 1 g/hr to about 15 g/hr.