Multi-layer Device Isolation Region for Semiconductor Short Circuit Prevention
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Solution Overview
Problem
Semiconductor devices face challenges in preventing short circuits between adjacent transistors, which affect their reliability and operating characteristics.
Innovation Solution
The semiconductor device design includes a fin-type pattern with specific gate structures and spacers, along with a trench and isolating films, to create a multi-layer device isolation region that reduces the risk of short circuits between source/drain regions of adjacent transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device isolation regions are formed between adjacent transistors, then short circuit prevention is improved, but device complexity increases
Solution Approach 1:
The device isolation region is segmented into multiple discrete isolation structures positioned between adjacent transistors. Each isolation structure includes separate isolation regions for different fin portions, dividing the isolation function into distinct segments rather than using a continuous isolation layer. This segmentation provides effective short circuit prevention while maintaining manageable structural complexity.
Solution Approach 2:
The isolation structures are designed with non-uniform characteristics where the first fin portion has a different height than the second fin portion. The device isolation regions are specifically positioned and sized to match these local variations, providing optimized isolation at each location rather than applying a uniform isolation structure throughout. This local quality approach enhances short circuit prevention effectiveness.
2Reliability
If multi-layer device isolation regions are implemented, then isolation effectiveness is improved, but manufacturing complexity increases
Solution Approach 1:
The device isolation structures extend in the vertical dimension with different heights corresponding to the fin portion heights. The first device isolation region aligns with the first fin portion height while the second device isolation region aligns with the second fin portion height, creating a multi-layer isolation architecture. This dimensional approach provides enhanced isolation effectiveness by addressing short circuit prevention at multiple vertical levels.
3Reliability
If device isolation regions are formed, then transistor isolation is improved, but fabrication process complexity increases
Solution Approach 1:
The device isolation regions are formed as preliminary structures before final transistor fabrication steps. By pre-positioning the isolation regions at their designated locations between adjacent transistors, the subsequent fabrication processes can proceed without additional isolation formation steps. This preliminary action simplifies the overall fabrication process while ensuring proper transistor isolation is achieved.
Data Source
AI summary
Semiconductor devices are provided. A semiconductor device includes a semiconductor substrate. The semiconductor device includes first and second source/drain regions in the semiconductor substrate. Moreover, the semiconductor device includes a multi-layer device isolation region in the semiconductor substrate between the first and second source/drain regions. The multi-layer device isolation region includes a protruding portion that protrudes away from the semiconductor substrate beyond respective uppermost surfaces of the first and second source/drain regions.