Dielectric Isolation Structure for Scaled Semiconductor Patterning
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Solution Overview
Problem
The semiconductor industry faces challenges in forming reliable semiconductor devices at smaller sizes due to increased complexity and difficulty in fabrication processes as feature sizes continue to decrease, leading to issues with processing and manufacturing complexity.
Innovation Solution
The process involves forming semiconductor protruding structures with dielectric and insulating layers, using double-patterning or multi-patterning techniques, and selectively depositing protective layers to maintain the profiles and dimensions of dielectric structures during etching, ensuring the reliability and performance of the semiconductor device structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feature sizes continue to decrease to increase functional density, then production efficiency and cost are improved, but fabrication process complexity and difficulty increase
Solution Approach 1:
The fabrication process is divided into multiple discrete stages including forming first and second trenches at different depths, selective epitaxial growth in specific regions, and staged deposition of dielectric layers. This segmentation allows complex processes to be managed in manageable steps while maintaining scalability for smaller feature sizes
Solution Approach 2:
Dielectric structures are formed preliminarily between semiconductor protruding structures before final device assembly. Protective layers are deposited in advance to preserve critical dimensions during subsequent etching processes. These preliminary actions prevent defects that would otherwise arise during later fabrication steps, enabling reliable manufacturing at smaller scales
2Productivity
If feature sizes continue to decrease to increase functional density, then production efficiency and cost are improved, but manufacturing reliability deteriorates
Solution Approach 1:
Dielectric structures are formed in advance between semiconductor protruding structures to act as protective barriers. These pre-formed dielectric structures cushion and prevent unwanted merging or interaction between adjacent epitaxial structures during subsequent processing, ensuring manufacturing reliability even as feature sizes decrease
Solution Approach 2:
Dielectric layers serve as intermediary structures between semiconductor protruding structures and epitaxial regions. These intermediary dielectric structures mediate the spatial relationships and prevent direct unwanted interactions, maintaining device reliability at scaled dimensions
3Manufacturing precision
If double-patterning or multi-patterning techniques are used to form semiconductor protruding structures, then structural precision is improved, but process complexity increases
Solution Approach 1:
The patterning process is segmented into multiple stages forming first and second trenches at different depths, with selective epitaxial growth performed between these stages. This segmented approach achieves high structural precision through controlled sequential processing rather than attempting single-step patterning
Solution Approach 2:
The fabrication employs periodic cycles of deposition, etching, and selective growth operations. Dielectric layers are deposited, trenches are etched, epitaxial growth occurs, then additional dielectric layers are deposited. This periodic action sequence enables precise structural formation while maintaining process control
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 allows for the reliable formation of semiconductor devices with improved structural integrity and performance by maintaining the profiles and dimensions of dielectric structures, preventing undesired merging of epitaxial structures and ensuring the reliability of the semiconductor device structure.
Implementation Method 1
forming a protective layer to cover a topmost surface of the dielectric structure
Implementation Method 2
recessing the insulating layer after the protective layer is formed such that the semiconductor protruding structure and the dielectric structure protrude from a top surface of a remaining portion of the insulating layer
Data Source
AI summary
A method for forming a semiconductor device is provided. The method includes forming a semiconductor protruding structure over a substrate and surrounding the semiconductor protruding structure with an insulating layer. The method also includes forming a dielectric layer over the insulating layer. The method further includes partially removing the dielectric layer and insulating layer using a planarization process. As a result, topmost surfaces of the semiconductor protruding structure, the insulating layer, and the dielectric layer are substantially level with each other. In addition, the method includes forming a protective layer to cover the topmost surfaces of the dielectric layer. The method includes recessing the insulating layer after the protective layer is formed such that the semiconductor protruding structure and a portion of the dielectric layer protrude from a top surface of a remaining portion of the insulating layer.