Gate Spacer and Insulation Pattern for Semiconductor Device Isolation
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Solution Overview
Problem
Current semiconductor devices face challenges in achieving high integration, reliability, and multifunctionality due to limitations in device isolation and gate electrode separation, which affect electrical characteristics and lead to potential electrical shorts during manufacturing.
Innovation Solution
The semiconductor device incorporates a first and second active pattern on a substrate with gate electrodes and insulation patterns arranged in a specific direction, including a gate spacer and insulation layers to separate PMOSFET and NMOSFET regions, ensuring a large distance between gate electrodes and preventing electrical shorts through strong etch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gate electrodes are placed closer together to increase integration density, then device integration is improved, but electrical shorts between gate electrodes may occur
Solution Approach 1:
An insulation pattern is introduced as an intermediary element between adjacent gate electrodes to prevent electrical shorts. The insulation pattern includes a first insulation layer filling a groove between gate electrodes and a second insulation layer formed on the first insulation layer, creating a reliable dielectric barrier that enables closer gate spacing without causing electrical interference.
Solution Approach 2:
The insulation structure is segmented into multiple layers (first insulation layer and second insulation layer) with different functions. The first insulation layer provides base isolation in the groove, while the second insulation layer provides additional protection and planarization, allowing the system to achieve both high integration and reliability through divided functional layers.
2Reliability
If insulation layers are made thicker to prevent electrical shorts, then reliability is improved, but device area increases
Solution Approach 1:
The insulation structure transitions from a single-layer planar approach to a multi-layer vertical architecture. By stacking the first insulation layer in the groove and the second insulation layer on top, the solution provides enhanced electrical isolation through the vertical dimension while maintaining a compact lateral footprint, thus preventing electrical shorts without significantly increasing device area.
Solution Approach 2:
The first insulation layer is nested within the groove structure between gate electrodes, and the second insulation layer is formed on top of it, creating a nested multi-layer configuration. This nested arrangement maximizes insulation effectiveness within a minimized space envelope.
Data Source
AI summary
A semiconductor device includes a first active pattern and a second active pattern on a substrate, a first gate electrode and a second gate electrode respectively across the first active pattern and the second active pattern, a first insulation pattern between and separating the first and second gate electrodes, a gate spacer on a sidewall of the first gate electrode, on a sidewall of the second gate electrode, and on a sidewall of the first insulation pattern, and a second insulation pattern between the gate spacer and the sidewall of the first insulation pattern, wherein the first gate electrode, the first insulation pattern, and the second gate electrode are arranged along a first direction, and wherein the gate spacer extends in the first direction.