Electronic-Structure Modulation Transistor Bandwidth Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional field-effect transistors rely on band edge shifts induced by external gate voltages, which are limited by thermal effects and require higher voltages, whereas electronic-structure modulation transistors address this by modifying band dispersion using gate voltages to achieve bandwidth modulation in channels made of materials like graphene nanoribbons, enabling efficient operation with low supply voltage.
Innovation Solution
The electronic-structure modulation transistor employs two gates separated by dielectric layers to create an electric field across a channel, modifying its bandwidth through gate voltage modulation, allowing for both enhancement and depletion modes of operation with high ON/OFF ratios and low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional field-effect transistors use band edge shift with external gate voltage, then the transistor can create a channel between source and drain, but the operation requires higher voltages and is limited by thermal effects
Solution Approach 1:
The patent changes the fundamental parameter being modulated from band edge position (conventional FET) to bandwidth (this invention). By applying gate voltage to modify the bandwidth of the channel material's electronic states rather than shifting band edges, the transistor achieves control with much lower voltages (few kT) and avoids thermal limitations that constrain conventional band edge modulation
Solution Approach 2:
The patent replaces the conventional electrical field effect (moving band edges) with an electronic structure modulation effect (modifying bandwidth through electric field). This substitution of the underlying physical mechanism enables operation below thermal limits by exploiting quantum mechanical band structure modulation rather than classical field-induced band shifting
2Speed
If velocity/mobility modulation transistors use real-space transfer of carriers between materials with different mobilities, then the transistor can modulate carrier velocity, but the device complexity increases
Solution Approach 1:
The patent applies local quality by creating a specific channel region with unique electronic structure properties (bandwidth-modulable material) between source and drain. Instead of requiring multiple materials with different mobilities throughout the device, only the channel region needs special properties, while source and drain can use conventional materials, thereby reducing overall device complexity
Solution Approach 2:
The patent segments the transistor into distinct functional regions: source electrode, drain electrode, and a specially-designed channel with bandwidth-modulable material. This segmentation allows the complex bandwidth modulation mechanism to be confined to a small channel region while keeping source and drain structures simple and conventional
3Extent of automation
If quantum modulation transistors use constructive and destructive interference of wavefunctions by changing T-shaped box dimensions, then the transistor can modulate carrier flow, but the manufacturing precision requirements increase
Solution Approach 1:
The patent changes the control parameter from geometric dimensions (T-shaped box size) to electrical parameter (gate voltage). By modulating bandwidth through electric field rather than physically changing channel dimensions, the invention achieves quantum effect control while avoiding stringent manufacturing precision requirements for channel geometry
Solution Approach 2:
The patent creates a dynamically controllable channel bandwidth through gate voltage application. Instead of requiring precise static geometric configurations to achieve quantum modulation, the system uses dynamic electrical control to adjust bandwidth, allowing tolerance in manufacturing while maintaining quantum effect functionality
4Reliability
If Anderson localization is used to localize states near band edges, then the mobility edge can be achieved, but the effect is limited by thermal limit
Solution Approach 1:
The patent changes the localization mechanism from Anderson localization near band edges to bandwidth modulation of midgap or near-midgap states. By focusing on localized states within the bandgap rather than at band edges, and modulating their bandwidth through electric field, the system achieves reliable state control below thermal limits
Solution Approach 2:
The patent replaces thermal-based Anderson localization with electric field-based bandwidth modulation of localized states. This substitution eliminates thermal limit constraints by using quantum mechanical bandwidth control rather than thermally-activated localization mechanisms
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 enables transistors to operate with a few kT of supply voltage, achieving high ON/OFF current ratios, negative differential resistance, and potential for GHz processor speeds with low power consumption and scalability beyond 10 nm, facilitating efficient electronic switching.
Implementation Method 1
two gates separated from a channel by corresponding dielectric layers... create an electric field across the channel... modifying its bandwidth through gate voltage modulation
Data Source
AI summary
An electronic structure modulation transistor having two gates separated from a channel by corresponding dielectric layers, wherein the channel is formed of a material having an electronic structure that is modified by an electric field across the channel.