Polysiloxane Isolation Layer for Semiconductor Defect Reduction
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Solution Overview
Problem
Existing semiconductor device manufacturing processes for oxide-based isolation layers often result in chemical, mechanical, and electrical defects due to various processes involved in forming insulation layers.
Innovation Solution
A method involving the formation of a trench on a semiconductor substrate, followed by coating a siloxane composition to create a preliminary filling insulation layer, which is then cured at low temperatures to form a polysiloxane-based filling insulation layer, and subsequently planarized to form an isolation layer, with an optional dry oxidation process to transform the upper portion into a modified silicate structure, all while omitting the need for a nitride liner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional insulation layer formation processes are used, then the isolation layer can be formed, but chemical, mechanical and electrical defects occur in the semiconductor substrate
Solution Approach 1:
The patent changes the chemical composition parameters of the insulation layer by using siloxane-based materials with specific Si-O bond configurations instead of traditional materials. This parameter change in material composition eliminates the generation of chemical, mechanical and electrical defects while maintaining the isolation function, thereby improving reliability without compromising the formation process
Solution Approach 2:
The patent converts the potential harm of complex multi-step processes into benefit by simplifying the process flow. By using siloxane-based materials that can be deposited and cured in fewer steps, the patent eliminates defect-generating processes while maintaining or improving the quality of the isolation layer, thus converting process complexity from a harmful factor into a benefit through simplification
2Reliability
If multiple process steps are used to form the insulation layer, then the isolation layer can be formed, but the manufacturing process becomes complex
Solution Approach 1:
The patent merges multiple process steps into a simplified sequence by combining deposition and curing operations for siloxane-based materials. This merging reduces the total number of process steps while maintaining the formation of high-reliability isolation layers, thereby resolving the contradiction between reliability improvement and process complexity
Solution Approach 2:
The patent extracts and eliminates unnecessary process steps from the traditional insulation layer formation process. By removing redundant operations and keeping only the essential deposition and curing steps for siloxane-based materials, the patent simplifies the manufacturing process while maintaining or improving the reliability of the isolation layer
3Reliability
If a nitride liner is used in the trench, then the trench can be protected, but adhesion and affinity with the oxide liner are reduced
Solution Approach 1:
The patent changes the material parameter from nitride-based liner to siloxane-based insulation layer, which inherently provides better adhesion and affinity with the oxide liner. This parameter change in material composition eliminates operational failures related to poor adhesion while maintaining trench protection functionality
Solution Approach 2:
The patent uses composite material structure where siloxane-based insulation layer works synergistically with the oxide liner. The Si-O bonds in siloxane materials create strong chemical affinity with the oxide liner, forming a composite structure with enhanced adhesion properties that eliminates operational failures associated with traditional nitride liner configurations
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
This approach enhances the mechanical and electrical reliability of semiconductor devices by reducing defects and simplifying the manufacturing process, as the polysiloxane-based isolation layer provides improved adhesion and affinity with the oxide liner, eliminating the need for a nitride liner and associated operational failures.
Implementation Method 1
A low temperature curing process may be performed at a temperature in a range from about 50° C. to about 150° C. such that the preliminary filling insulation layer may be transformed into a filling insulation layer including polysiloxane
Implementation Method 2
An isolation layer may be formed by planarizing the filling insulation layer
Implementation Method 3
at least an upper portion of the isolation layer may be transformed into a modified isolation layer by a dry oxidation process
Data Source
AI summary
A method of manufacturing a semiconductor device comprising the steps of: forming a trench at an upper portion of a semiconductor substrate forming a preliminary filling insulation layer by coating a siloxane composition on the semiconductor substrate to fill the trench performing a low temperature curing process at a temperature in a range from about 50° C. to about 150° C. such that the preliminary filling insulation layer is transformed into a filling insulation layer including polysiloxane and forming an isolation layer by planarizing the filling insulation layer.