Monoalkyl Tin Trialkoxide Solution Stability via Water Content Control
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Solution Overview
Problem
Monoalkyl tin alkoxides and their hydrolysates are prone to precipitation and instability when exposed to moisture and air, leading to short shelf life and inconsistent performance in radiation-sensitive coatings, particularly in high-resolution patterning applications like EUV lithography.
Innovation Solution
The stability of monoalkyl tin trialkoxide solutions is enhanced by controlling the water content of the solvent, specifically adjusting it within ±15% of a target value, which extends the shelf life and reproducibility of the solutions, allowing for the formation of stable coatings that can be patterned effectively for extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If monoalkyl tin alkoxides are exposed to moisture and air, then the solutions can be prepared and stored, but precipitation and instability occur leading to short shelf life
Solution Approach 1:
The patent applies inert atmosphere by excluding moisture and air from the solution environment. This is achieved through careful control of water content in the solvent and storage under conditions that prevent exposure to atmospheric moisture, thereby preventing hydrolysis and precipitation of the monoalkyl tin alkoxides.
Solution Approach 2:
The patent applies parameter changes by precisely controlling the water content parameter of the solvent. By adjusting and maintaining water content within specific ranges (e.g., 0-500 ppm, or 0-1000 ppm), the stability and shelf life of the solutions are significantly improved without causing precipitation.
2Ease of manufacture
If water content in solvent is not controlled, then solution preparation is simple, but stability and reproducibility are poor
Solution Approach 1:
The patent applies parameter changes by establishing specific water content ranges (e.g., 0-500 ppm, 0-1000 ppm) as critical parameters for solution preparation. This controlled parameter approach ensures both ease of manufacture through straightforward water content adjustment and high reliability through consistent performance.
Solution Approach 2:
The patent applies feedback by implementing quality control measures that monitor and adjust water content during solution preparation. This feedback mechanism ensures that the water content remains within the specified ranges, thereby maintaining both ease of preparation and consistent performance across batches.
3Duration of action of stationary object
If water content is adjusted within ±15% of target value, then shelf life extends to over six months, but preparation requires precise water content control
Solution Approach 1:
The patent applies parameter changes by defining specific water content ranges (±15% of target value, e.g., 0-500 ppm or 0-1000 ppm) that balance shelf life extension with preparation simplicity. This parameter optimization achieves over six months shelf life without requiring excessively complex control systems.
Solution Approach 2:
The patent applies partial action by implementing water content control at a moderate level (±15% tolerance) rather than extreme precision. This partial control approach is sufficient to achieve the desired shelf life extension while avoiding the complexity of ultra-precise control systems.
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 controlled water content in the solvent significantly increases the stability of monoalkyl tin trialkoxide solutions, making them suitable for commercial use with shelf lives exceeding six months and providing reliable reproducibility in high-resolution patterning, even when exposed to air and water vapor.
Implementation Method 1
monoalkyl tin alkoxides and their hydrolysis and condensation products
Implementation Method 2
hydrolysis and condensation products
Data Source
AI summary
Precursor solutions for radiation patternable coatings are formed with an organic solvent and monoalkyl tin trialkoxides in which the water content of the solvent is adjusted to be within 10 percent of a selected value. Generally, the water content of the solvent is adjusted through water addition, although water removal can also be used. In some embodiments, the adjusted water content of the solvent can be from about 250 ppm by weight to about 10,000 ppm by weight. With the appropriate selection of ligands, the adjusted precursor solutions can be stable for at least about 42 days, and in some cases at least 8 months.