Dummy Gate Thermal Isolation in FinFET Self-Heating Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The shrinking critical dimension of metal oxide semiconductor field effect transistor (MOSFET) devices leads to significant self-heating issues in FinFET devices, affecting device reliability by increasing temperature and reducing carrier mobility, making it challenging to detect and manage heat generation effectively.
Innovation Solution
A semiconductor device structure comprising a substrate with a semiconductor fin, multiple MOS devices, and dummy gate structures that electrically isolate adjacent MOS devices, allowing for heat detection by comparing performance parameter curves before and during active device operation, and using isolation structures to minimize heat loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FinFET devices are used to suppress short channel effect, then device control capability is improved, but self-heating problems worsen
Solution Approach 1:
The device is segmented into multiple fins within the FinFET structure, allowing heat to be distributed across multiple discrete thermal pathways rather than concentrated in a single narrow fin, thereby reducing self-heating while maintaining control capability
Solution Approach 2:
A dummy gate structure is introduced as an intermediary element between adjacent MOS devices. This dummy gate acts as a thermal barrier that reduces heat transfer from active devices to neighboring structures, mitigating self-heating effects while preserving electrical isolation
2Productivity
If critical dimension is shrunk to increase device density, then device miniaturization is improved, but self-heating effects worsen
Solution Approach 1:
The patent transitions from two-dimensional planar heat dissipation to three-dimensional FinFET structures with vertical fins, providing additional thermal pathways in the vertical dimension that enhance heat dissipation capacity while maintaining small footprint and high device density
Solution Approach 2:
The dummy gate structure serves as a thermal intermediary that blocks excessive heat transfer between densely packed devices, allowing high device density to be maintained without proportional increase in self-heating effects
3Productivity
If multiple MOS devices are placed adjacent to each other on the same fin, then device integration is improved, but heat isolation becomes difficult
Solution Approach 1:
A dummy gate structure is positioned between adjacent MOS devices on the same fin, acting as a thermal mediator that blocks heat flow from one device to another while allowing both devices to remain electrically active and integrated on the shared fin structure
Solution Approach 2:
The continuous fin structure is effectively segmented by the dummy gate into distinct thermal zones, allowing multiple devices to share the fin's electrical connectivity while maintaining thermal isolation between adjacent devices
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 accurate detection and monitoring of heat generation in semiconductor devices, improving device reliability by isolating heat sources and reducing temperature-related performance degradation.
Implementation Method 1
The first dummy gate structure is operative to electrically isolate the first MOS device from the second MOS device when a first potential is applied to the dummy gate structure and a second potential is applied to the substrate
Implementation Method 2
the detection of a device self-heating effect presents a big challenge
Data Source
AI summary
A method for detecting heat generated by a semiconductor device including a first MOS device and an active device on a substrate is provided. The method includes obtaining a first curve of a performance parameter of the first MOS device as a function of temperature when the active device is not operating, obtaining a second curve of the performance parameter of the first MOS device as a function of temperature when the active device is operating, and obtaining a heat generating condition of the active device according to a degree of deviation between the first curve and the second curve.