Single Electron Transistor Room Temperature Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional single-electron transistors operate only at low temperatures due to the influence of gate voltage on tunneling barriers, limiting their ability to control electric potential and reducing peak-to-valley current ratio (PVCR) characteristics.
Innovation Solution
A single-electron transistor is designed using a trenched nano-wire structure with a gate that wraps most of the way around the quantum dot, minimizing the gate's influence on tunneling barriers and allowing effective control of the quantum dot's electric potential, enabling operation at room temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional gate structure covering source, drain and quantum dot is used, then the gate can control the electric potential of the quantum dot, but the gate voltage influences the tunneling barriers and deteriorates the peak-to-valley current ratio
Solution Approach 1:
The gate structure is segmented into separate regions: a first gate for controlling the quantum dot electric potential and a second gate for controlling the tunneling barriers. This segmentation allows independent control of each function, resolving the contradiction between potential control and current ratio maintenance.
Solution Approach 2:
The function of controlling tunneling barriers is extracted from the conventional single gate structure and assigned to a dedicated second gate. This extraction eliminates the harmful influence of gate voltage on tunneling barriers while preserving the quantum dot potential control function.
2Ease of operation
If the gate is formed to cover source and drain regions as well as quantum dot, then the gate can control electric potential, but the tunneling barrier height is lowered and PVCR characteristic is deteriorated
Solution Approach 1:
The gate is divided into two distinct gates: the first gate positioned over the quantum dot for potential control, and the second gate positioned over the tunneling barriers for barrier height control. This segmentation prevents the harmful lowering of tunneling barrier height while maintaining electric potential control capability.
Solution Approach 2:
The second gate acts as an intermediary element that specifically modulates the tunneling barrier height without directly affecting the quantum dot potential. This intermediary structure resolves the harmful effect of gate voltage on barrier height.
3Temperature
If a single-electron transistor is designed for room temperature operation, then the operating temperature is increased, but the device requires precise control of total capacitance and tunneling barriers
Solution Approach 1:
The dual-gate structure segments the control functions, allowing precise independent adjustment of quantum dot capacitance and tunneling barrier characteristics. This segmentation enables room temperature operation by providing the necessary control precision without requiring complex manufacturing processes.
Solution Approach 2:
The separate gates enable independent adjustment of electrical parameters (potential and barrier height) to optimize device performance for room temperature operation. This parameter control capability compensates for thermal effects and maintains precise operation at elevated temperatures.
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 allows for improved peak-to-valley current ratio (PVCR) characteristics and increased operating temperature, while also simplifying the manufacturing process and reducing total capacitance, enabling efficient room-temperature operation.
Implementation Method 1
The single-electron transistor is advantageous in that it can greatly reduce power consumption to the microwatt level because it can control the ON/OFF switching current using one electron
Implementation Method 2
The single-electron transistor must include a tunneling barrier between the quantum dot and the source (and also the drain) because it uses a tunneling phenomenon
Data Source
AI summary
The present invention relates to a single-electron transistor (SET) operating at room temperature and a method of manufacturing the same, and to be specific, to a single-electron transistor operating at room temperature and a method of manufacturing the same, which are capable of minimizing influence of the gate voltage on tunneling barriers and effectively controlling the electric potential of a quantum dot (QD), by forming the quantum dot using a trenched nano-wire structure and forming the gate to wrap most of the way around the quantum dot.