Dielectric-Isolated BJT Layout for Tighter Gate Spacing
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Solution Overview
Problem
As semiconductor devices continue to shrink in size to achieve higher integration density, challenges arise in maintaining the performance and efficiency of bipolar junction transistors (BJTs), particularly in reducing spacing between transistors and minimizing current leaks.
Innovation Solution
The formation of dielectric isolation structures between the gates of GAA or FinFET transistors in BJTs, using a cut metal gate process, allows for reduced spacing and compatibility with existing logic device processes, thereby enhancing transistor performance and reducing current leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the minimum feature size is reduced to improve integration density, then more components can be integrated into a given area, but current leaks increase and device performance deteriorates
Solution Approach 1:
A dielectric isolation structure is introduced as an intermediary element between adjacent transistor gates. This dielectric layer acts as a mediator that blocks current leakage paths while allowing the transistors to be positioned closer together, thereby enabling reduced spacing without compromising device performance or increasing current leaks
2Productivity
If the spacing between transistors is reduced to improve integration density, then more components can be integrated into a given area, but current leaks between adjacent transistors increase
Solution Approach 1:
The dielectric isolation structure serves as a current-blocking intermediary positioned between adjacent transistor gates. This intermediate dielectric layer prevents direct current leakage paths between neighboring transistors, enabling tighter spacing while eliminating the harmful current leakage effect
3Productivity
If new fabrication processes are developed to reduce spacing between BJTs, then integration density can be improved, but manufacturing complexity and cost increase
Solution Approach 1:
The dielectric isolation structure is formed using existing fabrication processes and materials that are already part of the semiconductor manufacturing toolkit. By utilizing standard dielectric deposition and patterning techniques, the solution achieves reduced BJT spacing without requiring entirely new fabrication processes, thereby maintaining ease of manufacture while improving integration density
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the BJTs to operate efficiently with reduced gate spacing, minimizing current leaks and maintaining performance, while being compatible with existing fabrication processes.
Implementation Method 1
dielectric isolation structures formed between gates of the GAA or FinFET transistors
Data Source
AI summary
Embodiments provide bipolar junction transistors (BJTs) which are formed from GAA or FinFET transistors and methods of forming the BJTs. The BJTs include dielectric isolation structures formed between gates of the GAA or FinFET transistors. The dielectric isolation structures reduce spacing between transistors of neighboring terminals of the BJTs. The dielectric isolation structures allow the BJTs to use the nominal gate spacing (Lg) as logic device, thereby, compatible with the GAA or FinFET processes.