Semiconductor Isolation Structure Layout for Multi-Height Dielectric Regions
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Solution Overview
Problem
Existing methods for forming isolation structures on hybrid substrates in MOS fabrication face challenges such as yield losses and inefficiencies in achieving different heights for isolation structures in various regions, leading to higher manufacturing costs and suboptimal dielectric isolation.
Innovation Solution
A method involving separate operations to form isolation structures of different heights in different regions by defining distinct portions of the dielectric structure, allowing for greater packing density and improved dielectric isolation, which includes forming a semiconductor substrate with multiple regions, depositing a dielectric layer, etching to create isolation structures of varying heights, and forming a semiconductor layer to cover these regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If isolation structures of different heights are formed in separate operations, then manufacturing cost is reduced and dielectric isolation is improved, but device complexity and process steps increase
Solution Approach 1:
The isolation structure formation process is segmented into separate operations for different regions. First isolation structures are formed in a first region, then second isolation structures of different heights are formed in a second region. This segmentation allows optimization of each region's isolation structures independently, reducing manufacturing cost and improving dielectric isolation while managing complexity through systematic process separation.
Solution Approach 2:
Different isolation structure heights are implemented in different regions of the semiconductor substrate. The first region receives first isolation structures with specific heights, while the second region receives second isolation structures with different heights tailored to local requirements. This local quality approach optimizes dielectric isolation for each region's specific needs without requiring uniform high-cost processing across the entire substrate.
2Reliability
If isolation structures of different heights are formed in separate operations, then dielectric isolation is improved, but manufacturing time and process complexity increase
Solution Approach 1:
The formation of isolation structures is divided into segmented operations where first isolation structures are formed in a first operation and second isolation structures are formed in a second operation. This segmentation enables each region to achieve optimal dielectric isolation tailored to its specific requirements, improving overall reliability while managing manufacturing time through efficient process sequencing.
Solution Approach 2:
Different heights of isolation structures are provided in different regions based on local dielectric isolation requirements. The first region receives isolation structures optimized for its specific needs, while the second region receives differently configured isolation structures. This local optimization improves dielectric isolation reliability without requiring uniform over-processing across the entire substrate, thereby reducing unnecessary manufacturing time.
3Area of moving object
If separate operations are used to form isolation structures in different regions, then packing density is improved, but process complexity increases
Solution Approach 1:
The semiconductor substrate is divided into first and second regions with different isolation structure configurations. First isolation structures are formed in the first region and second isolation structures are formed in the second region through separate operations. This segmentation enables optimized packing density in each region by tailoring isolation structure heights to local device requirements, maximizing area utilization while managing process complexity through systematic regional differentiation.
Solution Approach 2:
Different isolation structure heights are implemented in different regions to optimize packing density locally. The first region's isolation structures are configured for its specific device layout, while the second region's isolation structures are configured for its different device layout. This local quality approach improves overall packing density by eliminating the need for uniform isolation structures that would constrain optimization in specific regions.
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 lower manufacturing costs, better dielectric isolation, and reduced leakage by allowing for the formation of isolation structures of specific heights in separate operations, improving the overall efficiency of semiconductor structure fabrication.
Implementation Method 1
depositing a dielectric layer
Implementation Method 2
etching to create isolation structures of varying heights
Data Source
AI summary
A semiconductor structure and a method for forming a semiconductor structure are provided. The method includes receiving a semiconductor substrate having a first region and a second region; forming a dielectric layer over the semiconductor substrate; removing portions of the dielectric layer to form a dielectric structure in the first region, wherein the dielectric structure includes a base structure and a plurality of first isolation structures over the base structure; forming a semiconductor layer covering the first region and the second region; removing a portion of the semiconductor layer to expose a top surface of the plurality of first isolation structures; and forming a plurality of second isolation structures in the second region.