Semiconductor Contact Layout for Compact Schottky Diode Integration
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Solution Overview
Problem
As semiconductor devices continue to integrate more components into a given area with reduced minimum feature sizes, challenges arise in efficiently forming and optimizing the layout of semiconductor elements such as transistors and diodes.
Innovation Solution
A method involving the formation of shallow trench isolation (STI), gate structures, doped regions, and contact plugs is employed, allowing for the fabrication of semiconductor devices like Schottky diodes with minimized area requirements by using spacers and ion implantation to define doped regions and forming metal gates through a replacement metal gate process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If minimum feature sizes are reduced to increase integration density, then more components can be integrated into a given area, but additional fabrication problems and layout optimization challenges arise
Solution Approach 1:
The patent divides the doped region formation into multiple discrete steps with distinct functions: first doped region formation, second doped region formation, first contact plug formation, and second contact plug formation. Each step is clearly separated and optimized independently, allowing complex device structures to be built through systematic segmentation of the fabrication process.
Solution Approach 2:
The patent performs preliminary actions by forming the first doped region and first contact plug before forming the second doped region and second contact plug. This sequential preliminary action approach ensures proper spatial relationships and electrical connections are established early in the fabrication process, simplifying subsequent steps.
2Reliability
If multiple doped regions and contact plugs are formed to optimize device layout, then component functionality is improved, but fabrication process steps increase
Solution Approach 1:
The patent merges the formation of multiple doped regions and contact plugs into a coordinated sequence where spatial relationships are established efficiently. The first doped region and second doped region are formed in adjacent relationships, and their respective contact plugs are formed in a unified process flow, reducing overall fabrication complexity while maintaining device functionality.
Solution Approach 2:
The patent applies local quality by forming doped regions with specific characteristics at different locations: the first doped region is formed between the first gate structure and STI with specific doping properties, while the second doped region is formed between the first doped region and first gate structure with potentially different doping characteristics. Each region is optimized for its specific functional requirement.
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 enables efficient integration of semiconductor components with reduced area requirements, enhancing the integration density and performance of devices like Schottky diodes.
Implementation Method 1
forming a first doped region between the first gate structure and the STI, forming a second doped region between the first doped region and the first gate structure
Data Source
AI summary
A method for fabricating a semiconductor device includes the steps of first forming a shallow trench isolation (STI) in a substrate, forming a first gate structure on the substrate and adjacent to the STI, forming a first doped region between the first gate structure and the STI, forming a second doped region between the first doped region and the first gate structure, forming a first contact plug on the first doped region, and then forming a second contact plug on the second doped region.