Deep Trench Protection Layer for Sidewall Chemical Resistance
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Solution Overview
Problem
Conventional semiconductor device fabrication techniques are inadequate in protecting the side walls of trenches and interfaces between dielectric layers from damaging mediums, leading to increased failure rates and decreased yield due to the smaller and less robust material and non-material separations in deep trenches.
Innovation Solution
A protection layer, such as an acid-resistant or metal atom-resistant layer, is applied along the walls of deep trenches to shield them from damaging chemicals, light, and reactive gases, thereby preventing damage to conductive features and structures within the semiconductor device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional semiconductor fabrication techniques are used, then manufacturing simplicity is maintained, but the side walls of trenches and interfaces between dielectric layers are damaged by processing mediums
Solution Approach 1:
A protection layer is deposited over the deep trench structure before subsequent processing steps. This preliminary protective measure shields the trench side walls and dielectric layer interfaces from damage by processing mediums during fabrication, preventing failures that would otherwise occur due to the small separations in deep trench structures
Solution Approach 2:
The protection layer acts as an intermediary barrier between the vulnerable trench structure and the damaging processing mediums. This intermediate layer prevents direct contact between the processing chemicals and the trench side walls, eliminating the harmful interaction while allowing the fabrication process to continue
2Productivity
If deep trenches with smaller separations are used to increase device density, then functional density increases, but the probability of failures during processing increases
Solution Approach 1:
The protection layer is applied in advance to the deep trench structure, creating a protective barrier before the high-risk processing steps occur. This allows the use of deep trenches with small separations for high device density while preventing the processing failures that would normally result from such tight tolerances
Solution Approach 2:
The protection layer serves as a cushioning barrier that absorbs or prevents the impact of processing mediums on the vulnerable trench structures. This beforehand protection enables the use of smaller separations in deep trenches without increasing the failure rate, thus allowing higher device density
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 protection layer enhances the robustness of deep trenches, reducing damage from processing mediums and increasing the yield of semiconductor devices by minimizing exposure to corrosive environments.
Implementation Method 1
A protection layer, such as an acid-resistant or metal atom-resistant layer, is applied along the walls of deep trenches to shield them from damaging chemicals, light, and reactive gases
Data Source
AI summary
A semiconductor device includes: at least one conductive feature disposed on a substrate; at least one dielectric layer overlying the substrate, a trench structure extending through the at least one dielectric layer; and a protection layer overlaying the trench structure.