Stacked Gate Separation Structure for Leakage-Resistant Semiconductor Devices
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Solution Overview
Problem
The increasing demand for high-performance, high-speed, and multifunctional semiconductor devices requires advanced integration techniques that effectively isolate gate electrodes while maintaining electrical insulation and preventing leakage currents.
Innovation Solution
A semiconductor device design featuring a gate separation portion with multiple vertically stacked layers, including a first and second gate separation layer, which separates gate electrodes and extends into the device isolation layer, enhancing electrical insulation and reducing leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single gate separation layer is used between gate electrodes, then the structure is simple and manufacturing is easier, but electrical insulation is insufficient and leakage currents occur
Solution Approach 1:
The gate separation structure is divided into multiple distinct layers (first gate separation layer and second gate separation layer) with different materials and functions. The first layer provides primary insulation using silicon oxide, while the second layer provides secondary insulation and leakage prevention using silicon nitride, creating a segmented multi-functional barrier that resolves the contradiction between simplicity and insulation reliability.
Solution Approach 2:
The gate separation structure employs composite materials by combining silicon oxide and silicon nitride layers. Each material contributes its unique properties: silicon oxide provides good insulation and interface quality, while silicon nitride provides high breakdown voltage and leakage prevention. This composite approach achieves superior electrical insulation without requiring a single complex material system.
2Reliability
If gate separation layers extend deeper into the substrate, then leakage current prevention improves, but manufacturing precision requirements increase
Solution Approach 1:
The gate separation structure is segmented into two layers with different extension depths: the first gate separation layer (silicon oxide) extends to a first depth, while the second gate separation layer (silicon nitride) extends to a greater second depth. This segmentation allows each layer to be optimized independently for its specific function, with the deeper second layer providing enhanced leakage prevention without requiring the entire structure to be uniformly deep, thereby reducing overall manufacturing precision requirements.
3Reliability
If multiple gate separation layers are stacked vertically, then electrical insulation and leakage prevention improve, but device complexity increases
Solution Approach 1:
The gate separation structure is segmented into functionally distinct layers: the first gate separation layer (silicon oxide) provides primary insulation with good interface characteristics, while the second gate separation layer (silicon nitride) provides secondary insulation and leakage prevention. This functional segmentation achieves superior electrical insulation through clear division of labor among layers, making the complex structure more manageable and manufacturable compared to a monolithic design.
Solution Approach 2:
Different regions of the gate separation structure are assigned different materials and depths according to local requirements: the first layer uses silicon oxide optimized for interface quality and primary insulation, while the second layer uses silicon nitride optimized for high breakdown voltage and leakage prevention. This local quality approach allows each region to be optimized for its specific function, achieving superior overall insulation without uniform complexity throughout the entire structure.
Data Source
AI summary
A semiconductor device including a plurality of active regions extending in a first direction on a substrate; a device isolation layer between the plurality of active regions such that upper portions of the plurality of active regions protrude from the device isolation layer; a first gate electrode and a second gate electrode extending in a second direction crossing the first direction and intersecting the plurality of active regions, respectively, on the substrate, the first gate electrode being spaced apart from the second gate electrode in the second direction; a first gate separation layer between the first gate electrode and the second gate electrode; and a second gate separation layer under the first gate separation layer and between the first gate electrode and the second gate electrode, the second gate separation layer extending into the device isolation layer in a third direction crossing the first direction and the second direction.