MOSFET Gate Isolation Layout for Precise Gate Cutting
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Solution Overview
Problem
As semiconductor devices are scaled down, the integration of MOSFETs faces challenges in maintaining electrical properties due to the complexity of forming gate cutting and separation structures simultaneously, leading to potential pattern defects and increased manufacturing costs.
Innovation Solution
The solution involves forming first and second isolation patterns simultaneously as a single unitary body, ensuring they are substantially the same in width, top surface level, and height, which simplifies the etching of the dielectric layer and minimizes defects in forming contacts, thereby improving the electrical properties of the semiconductor device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gate cutting and separation structures are formed separately, then manufacturing precision can be maintained, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the formation of gate cutting patterns and separation patterns into a single simultaneous etching process. The etch mask pattern includes both gate cutting portions and separation portions that are etched together to form both isolation structures in one step, reducing fabrication complexity while maintaining precision through unified process control
Solution Approach 2:
The etch mask pattern serves multiple functions simultaneously: it defines gate cutting locations, defines separation locations, and controls the etching depth for both structures. This multi-functional approach eliminates the need for separate masking and etching processes for each structure type
2Reliability
If multiple isolation structures are formed separately, then each structure can be optimized, but manufacturing time and cost increase
Solution Approach 1:
The patent merges the formation of first isolation patterns (gate cutting) and second isolation patterns (separation) into a single etching process. Both patterns are formed simultaneously from a unified etch mask, reducing manufacturing steps and time while ensuring consistent electrical isolation properties through controlled simultaneous formation
3Adaptability or versatility
If isolation patterns are formed at different levels, then structural flexibility is improved, but manufacturing precision decreases
Solution Approach 1:
The patent forms both first and second isolation patterns at substantially the same level during the same etching process. This equipotential approach ensures precise alignment and consistent electrical properties by eliminating level differences that would require additional alignment steps, while still providing the necessary structural isolation
Data Source
AI summary
A semiconductor device including a substrate; gate structures spaced apart from each other on the substrate, each gate structure including a gate electrode and a gate capping pattern; source/drain patterns on opposite sides of the gate structures; first isolation patterns that respectively penetrate adjacent gate structures; and a second isolation pattern that extends between adjacent source/drain patterns, and penetrates at least one gate structure, wherein each first isolation pattern separates the gate structures such that the gate structures are spaced apart from each other, the first isolation patterns are aligned with each other, and top surfaces of the first and second isolation patterns are each located at a level the same as or higher than a level of a top surface of the gate capping pattern.