Gate Separation Region Structure for Scaled Transistor Isolation
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Solution Overview
Problem
As semiconductor devices strive for higher degrees of integration, reducing transistor size becomes essential, but this poses challenges in forming smaller gate components and maintaining effective isolation regions.
Innovation Solution
The semiconductor device incorporates a gate separation region with a gap fill layer and a buffer structure, including a buffer liner between the gap fill layer and the isolation region, to enhance isolation and support the formation of smaller gate line structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If transistor size is reduced to achieve higher integration, then area occupied by transistor is reduced, but manufacturing precision and process difficulty increase
Solution Approach 1:
The gate separation region is divided into multiple functional layers: a buffer structure layer and a gap fill layer. This segmentation allows each layer to perform its specific function independently - the buffer structure provides stress control and isolation, while the gap fill layer maintains physical separation. This multi-layer approach enables better control over the gate structures as they shrink in size.
Solution Approach 2:
The gate separation region employs different materials with specific properties at different locations. The buffer structure uses materials with controlled stress characteristics, while the gap fill layer uses materials optimized for gap filling. This local differentiation of material properties allows the structure to simultaneously address multiple requirements - stress control, isolation, and dimensional stability - in different regions of the same component.
2Productivity
If isolation region size is reduced to support smaller transistors, then device density increases, but isolation effectiveness and defect reduction become more challenging
Solution Approach 1:
The gate separation region uses a composite structure combining the buffer structure and gap fill layer. This composite approach allows the system to achieve both compact dimensions and effective isolation - the buffer structure provides the necessary stress control and electrical isolation, while the gap fill layer ensures physical separation and structural integrity. Together, these materials work synergistically to maintain reliability in reduced-size devices.
Data Source
AI summary
A semiconductor device including a gate separation region is provided. The semiconductor device includes an isolation region between active regions; interlayer insulating layers on the isolation region; gate line structures overlapping the active regions, disposed on the isolation region, and having end portions facing each other; and a gate separation region disposed on the isolation region, and disposed between the end portions of the gate line structures facing each other and between the interlayer insulating layers. The gate separation region comprises a gap fill layer and a buffer structure, the buffer structure includes a buffer liner disposed between the gap fill layer and the isolation region, between the end portions of the gate line structures facing each other and side surfaces of the gap fill layer, and between the interlayer insulating layers and the side surfaces of the gap fill layer.