MOSFET Field Plate Insulation With Air Gaps for Lower Capacitance
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Solution Overview
Problem
Semiconductor devices, such as MOSFETs, face challenges in reducing parasitic capacitance while maintaining device performance and manufacturing efficiency, as increasing the thickness of insulating portions to reduce capacitance can lead to wafer warpage and manufacturing issues.
Innovation Solution
Incorporating an air-gap region within the field plate insulating portion to decrease the dielectric constant of the insulating material, thereby reducing parasitic capacitance without significantly increasing the thickness, and improving handling by absorbing wafer warpage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the thickness of the insulating portion is increased to reduce parasitic capacitance, then parasitic capacitance is reduced, but wafer warpage occurs and manufacturing becomes difficult
Solution Approach 1:
The insulating portion is designed with an air-gap region creating a porous structure. This reduces the effective dielectric constant of the insulating material, thereby reducing parasitic capacitance without increasing the physical thickness of the insulating portion. The porous structure maintains mechanical support while achieving electrical isolation.
Solution Approach 2:
The insulating portion is formed as a composite structure combining first and second insulating materials with different properties. The first insulating material has higher dielectric constant and the second has lower dielectric constant. This composite arrangement optimizes both electrical performance (parasitic capacitance reduction) and mechanical stability (wafer warpage prevention).
2Loss of energy
If the thickness of the insulating portion is increased to reduce parasitic capacitance, then parasitic capacitance is reduced, but manufacturing time and cost increase
Solution Approach 1:
By creating air-gaps within the insulating portion, the effective dielectric constant is reduced without requiring increased thickness. This achieves parasitic capacitance reduction while maintaining reasonable manufacturing timelines, as the structure can be formed through standard semiconductor fabrication processes.
Solution Approach 2:
The invention changes the dielectric parameter of the insulating portion by introducing air-gaps and using materials with different dielectric constants. This parameter optimization allows parasitic capacitance reduction without the need for excessive thickness increases that would extend manufacturing cycles.
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
The air-gap region effectively reduces parasitic capacitance and enhances insulating properties, minimizing manufacturing costs and time while preventing wafer handling problems.
Implementation Method 1
Incorporating an air-gap region within the field plate insulating portion to decrease the dielectric constant of the insulating material, thereby reducing parasitic capacitance
Implementation Method 2
improving handling by absorbing wafer warpage
Data Source
AI summary
A semiconductor device includes a first electrode; a first semiconductor region provided on the first electrode; a second semiconductor region provided on the first semiconductor region; a third semiconductor region provided on the second semiconductor region; a second electrode provided on the third semiconductor region and electrically connected to the third semiconductor region; a third electrode aligned with the first semiconductor region and the second semiconductor region; a gate electrode provided between the third electrode and the second semiconductor region; a first insulating portion including a first insulating region provided between the third electrode and the first semiconductor region and facing the third electrode, a second insulating region facing the first semiconductor region, and at least one air-gap region located between the first insulating region and the second insulating region; and a second insulating portion provided between the gate electrode and the second semiconductor region.