Superconductor Transistor Switching Without Gate Oxide Leakage
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Solution Overview
Problem
Conventional semiconductor-based transistors face performance limitations due to issues like gate oxide leakage current, and there is a need for more efficient methods to switch and amplify electrical signals effectively.
Innovation Solution
The development of superconductor-based transistors that utilize the freeze-out property of semiconductors and resistive heat generation of superconductors to achieve transistor functionality, where a semiconducting wire and a superconducting wire are electrically isolated, with the superconducting wire transitioning from a superconducting to a non-superconducting state to switch the transistor between on and off states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional semiconductor-based transistors are used, then they can switch and amplify electrical signals, but gate oxide leakage current limits performance
Solution Approach 1:
The patent changes the operating parameters by utilizing temperature-dependent resistance changes in semiconductors and superconductors. The transistor switches between on and off states by transitioning the superconducting gate between superconducting (zero resistance) and non-superconducting (high resistance) states, eliminating gate leakage current while maintaining signal switching capability
Solution Approach 2:
The patent employs a composite structure combining semiconducting wires and superconducting wires. The semiconducting component provides temperature-dependent resistance properties, while the superconducting component provides zero-resistance state for gating, creating a hybrid device that overcomes the limitations of conventional semiconductor-only transistors
2Productivity
If device sizes decrease to improve integration, then more devices can be packed, but gate oxide leakage current increases and limits performance
Solution Approach 1:
The patent changes the gating mechanism from voltage-based (prone to leakage in scaled devices) to resistance-based using superconducting transitions. This allows for smaller device dimensions without increasing gate leakage, as the superconducting gate maintains zero resistance when on and high resistance when off, regardless of device scaling
Solution Approach 2:
The patent replaces the conventional electric field-based gating mechanism with a thermal/phase transition-based mechanism. Instead of using voltage to control gate leakage, the system uses temperature-controlled phase transitions in superconducting material to achieve clean on/off states without leakage
3Ease of operation
If superconducting wire transitions from superconducting to non-superconducting state, then transistor switches from off to on state, but heat is generated during transition
Solution Approach 1:
The patent deliberately utilizes the phase transition of superconducting material from superconducting state to non-superconducting state as the switching mechanism. The phase transition occurs at a critical temperature, providing a sharp and reliable switching point that enables clear on/off states with minimal energy dissipation compared to gradual transitions
4Reliability
If semiconducting wire is maintained below critical temperature, then current flow is blocked (off state), but switching speed may be limited
Solution Approach 1:
The patent employs periodic or pulsed thermal action to control the phase transitions. By applying periodic heating or cooling pulses to the superconducting gate, the system achieves rapid switching between states, overcoming the speed limitation while maintaining reliable off-state blocking when cold
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 allows for efficient switching and amplification of electrical signals by leveraging the temperature-dependent resistance changes in semiconductors and superconductors, enhancing the performance and efficiency of transistor devices.
Implementation Method 1
the superconducting wire transitions to a non-superconducting state. During the transition, the superconducting wire generates heat sufficient to heat the semiconducting wire above the critical temperature for current flow
Implementation Method 2
the semiconducting wire is initially maintained at a temperature below a critical temperature for current flow through the semiconducting wire (representing an 'off' state for the transistor and sometimes referred to as a 'freeze-out state')
Implementation Method 3
Superconductors are materials capable of operating in a superconducting state with zero electrical resistance under particular conditions. Additionally, in some circumstances, superconductors generate heat when transitioning from a superconducting state to a non-superconducting state
Data Source
AI summary
The various embodiments described herein include methods, devices, and systems for fabricating and operating transistors. In one aspect, a transistor includes: (1) a semiconducting component configured to operate in an on state at temperatures above a semiconducting threshold temperature; and (2) a superconducting component configured to operate in a superconducting state while: (a) a temperature of the superconducting component is below a superconducting threshold temperature; and (b) a first current supplied to the superconducting component is below a current threshold; where: (i) the semiconducting component is located adjacent to the superconducting component; and (ii) in response to a first input voltage, the semiconducting component is configured to generate an electromagnetic field sufficient to lower the current threshold such that the first current exceeds the lowered current threshold, thereby transitioning the superconducting component to a non-superconducting state.