High-k Electric Field Management Layer for Breakdown-Resistant Semiconductors
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Solution Overview
Problem
Semiconductor devices face premature breakdown due to electric field crowding and peak electric field strengths exceeding critical values, leading to potential damage and reduced voltage handling capabilities.
Innovation Solution
The implementation of a dielectric electric field management layer with a higher dielectric constant than the underlying passivation layer to redistribute and mitigate electric fields, forming a junction with the passivation layer and gate terminal to reduce peak electric field strengths and prevent breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional dielectric passivation layer is used, then the device structure is simple, but electric field crowding occurs at edges causing premature breakdown
Solution Approach 1:
The patent applies local quality by introducing a high-k dielectric layer specifically at regions where electric field crowding occurs (such as edge regions or areas with peak electric fields), while maintaining the conventional low-k dielectric passivation layer in other areas. This localized modification targets the specific problem of electric field crowding without unnecessarily complicating the entire device structure. The high-k dielectric layer is positioned to overlap with or be adjacent to the peak electric field region, providing enhanced electric field management precisely where needed.
Solution Approach 2:
The patent employs composite materials by combining a high-k dielectric material with a low-k dielectric material in a multi-layer structure. The high-k dielectric layer (with dielectric constant κ506) is disposed over the low-k dielectric passivation layer (with dielectric constant κ504), where κ506 > κ504. This composite structure leverages the high dielectric constant of the first material to reduce peak electric fields while maintaining the beneficial properties of the low-k passivation layer, such as reduced parasitic capacitance in non-critical regions.
2Reliability
If a high dielectric constant material is used for field management, then peak electric field is reduced, but the device structure becomes more complex
Solution Approach 1:
The patent applies parameter changes by modifying the dielectric constant parameter of the passivation structure. Specifically, it introduces a high-k dielectric material with a higher dielectric constant (κ506) than the conventional low-k dielectric material (κ504). This parameter change in the dielectric constant directly affects the electric field distribution, reducing the peak electric field strength at critical regions. The ratio of dielectric constants (κ504/κ506) determines the reduction of electric field, allowing for optimized voltage handling capability.
3Reliability
If multiple field management structures are added, then electric field distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the dielectric passivation structure into multiple functional layers: a low-k dielectric passivation layer and a high-k dielectric layer. This segmentation allows each layer to perform its specific function - the low-k layer provides general passivation and the high-k layer provides targeted electric field management. The segmented structure can be fabricated using sequential deposition processes, where each layer is formed in a separate manufacturing step, making the complexity manageable while achieving improved electric field distribution.
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
Effectively reduces peak electric field strengths by dissipating displacement fields, thereby preventing premature breakdown and enhancing the voltage handling capability of semiconductor devices.
Implementation Method 1
The dielectric electric field management layer 506 is provided from a material having a dielectric constant (κ) higher than the other layer (e.g. the dielectric passivation layer). The ratio of dielectric constants determines the reduction of electric field.
Data Source
AI summary
A semiconductor device having an electric field management layer. The electric field management layer comprises a material with a relatively high dielectric constant that minimizes the risk of an electric field within the semiconductor device breaking down and damaging the semiconductor device.