Transistor Field Electrode Dielectric Thickness Optimization
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Solution Overview
Problem
In transistors with a field electrode below a gate electrode, the capacitance between the electrodes decreases with increasing thickness of the dielectric layer, which affects the component's performance, particularly in blocking voltage and oscillation damping.
Innovation Solution
The method involves forming a dielectric layer between the gate and field electrodes with a thickness that is at least half of the vertical length of the field plate, allowing independent adjustment of this inter-electrode dielectric layer thickness, thereby optimizing the gate-field-plate capacitance and resistance to reduce parasitic oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dielectric layer thickness between gate and field electrodes is increased, then the gate-field-plate capacitance decreases, but the blocking voltage capability and oscillation damping performance improve
Solution Approach 1:
The patent applies parameter changes by systematically varying the dielectric layer thickness between the gate electrode and field electrode to optimize the gate-field-plate capacitance. By adjusting this geometric parameter, the invention achieves improved blocking voltage capability and oscillation damping while controlling the capacitance value to appropriate levels.
2Stability of the object's composition
If the dielectric layer thickness is increased, then parasitic oscillations are dampened, but the capacitance between gate and field electrodes decreases
Solution Approach 1:
The invention uses parameter changes by adjusting the dielectric layer thickness to simultaneously achieve oscillation damping and control capacitance. The optimized thickness range balances the stabilizing effect on parasitic oscillations with the need to maintain appropriate gate-field-plate capacitance for device operation.
3Reliability
If the dielectric layer thickness is optimized, then the transistor performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes through a systematic approach to dielectric layer thickness optimization that balances performance improvement with manufacturing feasibility. The invention provides specific thickness ranges and formation methods that achieve enhanced transistor performance while maintaining practical manufacturability through established semiconductor fabrication processes.
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 enhances the transistor's blocking voltage capability and effectively dampens parasitic oscillations by adjusting the dielectric layer thickness, improving the component's performance and reliability.
Implementation Method 1
The field electrode and the gate electrode are insulated from one another by a dielectric layer, with the gate electrode, the field electrode and this dielectric layer forming a capacitor. For a given dielectric constant of the dielectric layer between the gate and the field electrode a capacitance of this capacitor decreases with increasing thickness of the dielectric layer.
Implementation Method 2
The field electrode and the gate electrode are insulated from one another by a dielectric layer
Implementation Method 3
it compensates charge carriers in the drift zone, if the component is in its blocking state, thereby increasing a maximum blocking voltage of the component
Implementation Method 4
it shields the gate electrode against high electric field strengths, if the component is in its blocking state
Data Source
AI summary
A transistor component and method of forming a transistor component. One embodiment provides a semiconductor arrangement including a semiconductor body having a at least one first trench, a first field electrode arranged in the lower trench section of the at least one first trench and being insulated from the semiconductor body by a field electrode dielectric. A dielectric layer is formed on the first field electrode in the at least one first trench, including depositing a dielectric material on a first side of the semiconductor body and on the field plate at a higher deposition rate than on sidewalls of the at least one first trench.