Planarization Layer Formation for Trench Gap-Filling
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Solution Overview
Problem
Current semiconductor fabrication methods face limitations in minimizing critical dimensions due to uneven gap-filling of materials and thickness differences between patterns, which affect the planarization and patterning processes.
Innovation Solution
A method involving the application of pre-thinner and post-thinner coatings before and after forming the gap-filling material, followed by a spinning process to improve planarization characteristics and achieve uniform thickness, allowing for enhanced patterning and etching precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a gap-filling material is applied to fill gaps between patterns, then the gaps are filled, but the material is formed unevenly according to position or pattern on the wafer
Solution Approach 1:
A planarization layer is formed in advance before applying the gap-filling material. This preliminary layer provides a flat surface that ensures uniform application and thickness of the subsequent gap-filling material, preventing the uneven formation issue described in the contradiction.
Solution Approach 2:
The planarization layer acts as an intermediary between the substrate and the gap-filling material. It mediates the unevenness of the underlying surface, allowing the gap-filling material to be applied uniformly without being affected by position or pattern variations on the wafer.
2Manufacturing precision
If photolithography process is used to form patterns, then patterns are formed, but the critical dimension cannot be minimized below the critical resolution
Solution Approach 1:
The pattern formation process is segmented into multiple steps: first forming a planarization layer, then forming patterns using photolithography, and finally applying gap-filling material. This segmentation allows each step to be optimized independently, enabling critical dimensions below the traditional photolithography resolution limit.
Solution Approach 2:
The solution moves from a single-layer approach to a multi-layer vertical structure. By adding the planarization layer as a separate dimension, the system achieves finer critical dimensions through the combination of layers rather than relying solely on photolithography resolution.
3Ease of manufacture
If gap-filling material is used as hard mask, then patterning is enabled, but etching precision is reduced due to thickness differences between patterns
Solution Approach 1:
The planarization layer is formed in advance to create a uniform baseline surface. This preliminary action ensures that subsequent gap-filling material applied as hard mask has consistent thickness, thereby maintaining etching precision while enabling patterning capability.
Solution Approach 2:
The thickness uniformity parameter of the gap-filling material is improved by introducing the planarization layer. This parameter change transforms the variable thickness condition into a uniform thickness condition, enabling precise etching while maintaining patterning functionality.
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 achieves improved planarization and increased etching margin, ensuring uniform thickness regardless of pattern shape or position, facilitating easier patterning and uniform etching conditions.
Implementation Method 1
coating a pre-thinner over a surface of the trench; forming a gap-filling material in the trench; coating a post-thinner over the gap-filling material; and performing a spinning process to rotate the substrate
Data Source
AI summary
A method for forming a planarization layer includes: providing a substrate including a trench; coating a pre-thinner over a surface of the trench; forming a gap-filling material in the trench; coating a post-thinner over the gap-filling material; and performing a spinning process to rotate the substrate.