Amorphous Hot Electron Transistor Co-Planar Electrodes
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Solution Overview
Problem
Existing vertical hot electron transistors with amorphous metal layers exhibit asymmetric current-voltage responses due to one-way tunneling, limiting their performance and flexibility in electronic devices.
Innovation Solution
A three-terminal amorphous hot electron transistor with co-planar emitter and base electrodes, separated by a gap, enables two-way Fowler-Nordheim tunneling, allowing for symmetric current-voltage characteristics and adjustable performance without modifying the tunneling dielectric, by patterning the amorphous metal transport layer and electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vertical hot electron transistors with amorphous metal layers are used, then device performance is improved, but asymmetric current-voltage responses occur due to one-way tunneling
Solution Approach 1:
The patent inverts the conventional vertical transistor architecture by placing the amorphous metal layer horizontally between co-planar emitter and base electrodes. This structural inversion transforms the one-way tunneling characteristic into two-way tunneling, enabling symmetric current-voltage responses while maintaining hot electron transistor functionality.
Solution Approach 2:
The patent transitions from a vertical stacking architecture to a co-planar horizontal arrangement. By changing the spatial dimension from vertical to horizontal, the device achieves symmetric electron injection from both emitter and base electrodes into the amorphous metal layer, resolving the asymmetry issue while preserving performance.
2Ease of operation
If the tunneling dielectric is modified to achieve symmetric I-V characteristics, then current-voltage symmetry is improved, but device complexity increases
Solution Approach 1:
The patent achieves symmetric I-V characteristics by changing the geometric parameters of the device structure (co-planar electrode arrangement with specific gap dimensions) rather than modifying the electrical parameters of the tunneling dielectric. This approach maintains the simplicity of dielectric fabrication while achieving the desired symmetry through structural configuration.
3Ease of manufacture
If conventional vertical transistor architecture is used, then fabrication is simplified, but asymmetric tunneling behavior limits performance flexibility
Solution Approach 1:
The patent introduces dynamic control capability by enabling independent voltage application to the emitter and base electrodes in the co-planar configuration. This dynamic control allows flexible adjustment of tunneling currents and hot electron generation, providing performance versatility while maintaining fabrication simplicity through standard thin-film deposition techniques.
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 design enhances the performance of hot electron transistors with symmetric I-V characteristics, similar to amorphous metal non-linear resistors, and simplifies fabrication, suitable for integration into LCD and OLED displays, offering improved signal control and flexibility in electronic devices.
Implementation Method 1
enables two-way Fowler-Nordheim tunneling, allowing for symmetric current-voltage characteristics
Data Source
AI summary
Amorphous multi-component metallic films can be used to improve the performance of electronic devices such as resistors, diodes, and thin film transistors. An amorphous hot electron transistor (HET) having co-planar emitter and base electrodes provides electrical properties and performance advantages over existing vertical HET structures. Emitter and the base terminals of the transistor are both formed in an upper crystalline metal layer of an amorphous nonlinear resistor. The emitter and the base are adjacent to one another and spaced apart by a gap. The presence of the gap results in two-way Fowler-Nordheim tunneling between the crystalline metal layer and the amorphous metal layer, and symmetric I-V performance. Meanwhile, forming the emitter and base terminals in the same layer simplifies the HET fabrication process by reducing the number of patterning steps.