Lateral Fin Static Induction Transistor With Buffer-Layer Isolation
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Solution Overview
Problem
Diamond-based electronics face limitations due to material availability and the lack of suitable dopants, particularly for N-type doping, which hinders their development as a mainstream technology despite their attractive properties such as high breakdown field and thermal conductivity.
Innovation Solution
A lateral, fin-based, static induction transistor with a multi-gate structure is developed, incorporating a fin channel and a drift region to enhance breakdown voltage and current conduction, utilizing a buffer layer to isolate the device from the substrate and reduce parasitic capacitance, thereby enabling high-frequency and high-power operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a lateral SIT structure is used to simplify parasitic components for high-frequency operations, then device operation frequency is improved, but channel isolation from substrate becomes challenging
Solution Approach 1:
An intrinsic or semi-insulating buffer layer is introduced between the doped channel and the substrate. This buffer layer acts as an intermediary that provides electrical isolation and prevents substrate punch-through effects, enabling reliable channel isolation in lateral SIT structures for high-frequency operations
Solution Approach 2:
The patent transitions from vertical device structures to lateral device structures. This dimensional change simplifies the parasitic capacitance between gate and drain, enabling high-frequency operations while the buffer layer compensates for the channel isolation challenge in the lateral configuration
2Strength
If diamond is used as the semiconductor material, then breakdown field and thermal conductivity are improved, but material availability and doping suitability deteriorate
Solution Approach 1:
The patent employs heavy doping of the channel region with boron to achieve high carrier concentrations. This parameter change in doping concentration compensates for the limited material availability by enhancing the electrical properties of diamond, making it suitable for high-power applications
Solution Approach 2:
The device structure combines diamond material with buffer layers and metal contacts to create a composite system. This composite approach addresses material availability issues by integrating diamond's superior breakdown field and thermal conductivity with other materials that facilitate manufacturing and device operation
3Quantity of substance
If boron doping is used in diamond, then P-type conductivity is achieved, but activation energy is high reducing suitability for certain applications
Solution Approach 1:
The patent uses extremely heavy boron doping concentrations to achieve high carrier concentrations that overcome the high activation energy barrier. By changing the doping parameter to very high levels, the material achieves sufficient conductivity for practical applications despite the energy barrier
Data Source
AI summary
Presented is a lateral fin static induction transistor including a semi conductive substrate, source and drain regions extending from an optional buffer layer of same or varied thickness supported by the semi conductive substrate, a semi conductive channel electrically coupling the source region to the drain region of the transistor, a portion of the semi conductive channel being a fin and having a face covered by a gated structure, thereby defining a gated channel within the semi conductive channel, the semi conductive channel further including a drift region electrically coupling the gated channel to the drain region of the transistor.