Bipolar Junction Transistor Fin Structure Metal Gate Spacing
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Solution Overview
Problem
The miniaturization of semiconductor components poses challenges in integrating non-planar FinFETs with other semiconductor structures like bipolar junction transistors, leading to non-uniform collector current due to reduced contact areas and miniaturized gaps between metal gates, affecting electrical performance.
Innovation Solution
A bipolar junction transistor design featuring fin structures with strategically placed metal gates and epitaxial layers, along with inter-layer dielectric layers and local contact plugs, to enhance the effective collector area and uniformity of collector current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gap between metal gates is reduced for miniaturization, then the integration density is improved, but the collector current uniformity deteriorates
Solution Approach 1:
The patent introduces a local contact plug structure that makes different regions of the device have different properties. The local contact plug is positioned specifically between metal gates to provide enhanced local contact area, while other regions maintain the miniaturized gap structure. This local differentiation allows the device to achieve both high integration density and good collector current uniformity in critical areas.
2Volume of moving object
If the contact area is reduced for miniaturization, then the device size is reduced, but the electrical performance deteriorates
Solution Approach 1:
The local contact plug is nested within the inter-layer dielectric layer structure, positioned between metal gates. This nested configuration allows the contact plug to provide enhanced contact area without increasing the overall device footprint. The contact plug is integrated into the existing multi-layer structure, achieving improved electrical performance while maintaining miniaturized device dimensions.
3Area of stationary object
If multiple metal gates are added to increase effective collector area, then the collector current uniformity is improved, but the device complexity increases
Solution Approach 1:
The local contact plug serves multiple functions simultaneously: it increases the effective collector area, improves collector current uniformity, and provides a standardized structural element that can be integrated into existing manufacturing processes. This multi-functional design achieves performance improvement without proportionally increasing device complexity.
Data Source
AI summary
A bipolar junction transistor (BJT) includes an emitter region, a base region surrounding the emitter region, and a collector region surrounding the base region. The emitter region includes a fin structures extending along a first direction, a first metal gate extending across the fin structure along a second direction, and a second metal gate disposed in parallel with the first metal gate. A spacing between the first metal gate and the second metal gate ranges between 0.2 micrometers and 0.4 micrometers.