Nanoelectromechanical Logic Devices With Flexible Bridges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Semiconductor transistors face challenges in scaling below 10 nm due to increased standby power, low off-to-on resistance ratio, and vulnerability to temperature and radiation, while alternative devices suffer from high switching voltages, low speed, large size, and limited temperature ranges.
Innovation Solution
The development of nanoelectromechanical logic devices featuring flexible bridges with control and logic electrodes, where voltages applied between control electrodes cause the bridges to flex, making electrical contact between logic electrodes, enabling compact and efficient logic operations with high resistance ratios and radiation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semiconductor transistors are scaled down below 10 nm gate length, then device density and integration are improved, but standby power increases and off-to-on resistance ratio deteriorates
Solution Approach 1:
The patent replaces semiconductor transistor mechanisms with nanoelectromechanical switch mechanisms. The NEMS device uses mechanically actuated switches with moving bridges that open and close physical gaps, substituting the electronic field-effect control of transistors with direct mechanical contact control. This mechanical switching approach achieves near-zero standby power when switches are open, while maintaining high device density through nanoscale dimensions.
Solution Approach 2:
The patent introduces control electrodes as intermediaries that generate electrostatic forces to actuate the mechanical switches. These control electrodes mediate between the applied voltage and the mechanical motion of the bridges, enabling electrical control of mechanical switches without direct electrical contact between control and signal paths, thus reducing leakage current.
2Productivity
If semiconductor transistors are scaled down below 10 nm gate length, then device density is improved, but off-to-on resistance ratio deteriorates
Solution Approach 1:
The patent replaces semiconductor transistor mechanisms with nanoelectromechanical switch mechanisms. The NEMS device uses mechanically actuated switches with moving bridges that open and close physical gaps, substituting the electronic field-effect control of transistors with direct mechanical contact control. This mechanical switching approach achieves near-zero standby power when switches are open, while maintaining high device density through nanoscale dimensions.
Solution Approach 2:
The patent employs flexible bridges as thin film structures that can bend and make contact. These flexible bridges are deposited as thin films and designed to deflect under electrostatic actuation, providing reliable mechanical contact when closed and complete electrical isolation when open, thus achieving high off-to-on resistance ratios.
3Productivity
If semiconductor transistors are scaled down to 10-30 nm gate lengths, then device density is improved, but temperature and radiation resistance deteriorates
Solution Approach 1:
The patent replaces semiconductor transistor mechanisms with nanoelectromechanical switch mechanisms. The NEMS device uses mechanically actuated switches with moving bridges that open and close physical gaps, substituting the electronic field-effect control of transistors with direct mechanical contact control. This mechanical switching approach achieves near-zero standby power when switches are open, while maintaining high device density through nanoscale dimensions.
Solution Approach 2:
The patent employs composite material structures for the NEMS devices, combining different materials with complementary properties. The devices use piezoelectric materials for actuation, flexible bridge materials for mechanical motion, and contact materials for reliable switching. This composite approach enables operation at elevated temperatures and provides resistance to radiation effects that would degrade pure semiconductor materials.
4Reliability
If mechanical switches are used, then radiation resistance and off-to-on resistance ratio are improved, but device size and switching voltage increase
Solution Approach 1:
The patent changes the size parameters of the mechanical switches to nanoscale dimensions. By reducing the bridge length, width, and gap dimensions to the nanometer scale, the device maintains the radiation resistance and high resistance ratio benefits of mechanical switches while minimizing the device area. The electrostatic actuation force scales favorably with reduced dimensions, keeping switching voltages practical.
5Reliability
If mechanical switches are used, then radiation resistance and off-to-on resistance ratio are improved, but switching speed deteriorates
Solution Approach 1:
The patent changes the size parameters of the mechanical switches to nanoscale dimensions. By reducing the bridge length, width, and gap dimensions to the nanometer scale, the device maintains the radiation resistance and high resistance ratio benefits of mechanical switches while minimizing the device area. The electrostatic actuation force scales favorably with reduced dimensions, keeping switching voltages practical.
Solution Approach 2:
The patent exploits the natural resonant frequency of the flexible bridges to achieve fast switching. By designing the bridges with appropriate dimensions and material properties, the switching operation is synchronized with the mechanical resonance, enabling rapid actuation and relaxation cycles that maximize switching speed while maintaining reliability.
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
These devices provide compact and efficient logic operations with improved yield and radiation resistance, reducing the need for multiple transistors and enabling operation at elevated temperatures, thus overcoming the limitations of semiconductor transistors.
Implementation Method 1
Voltages applied between the first and second control electrodes can cause the bridges to flex
Implementation Method 2
The bridges can flex toward each other to cause the first logic electrode to make electrical contact with the second logic electrode
Data Source
AI summary
Nanoelectromechanical logic devices can include a plurality of flexible bridges having control and logic electrodes. Voltages applied to control electrodes can be used to control flexing of the bridges. The logic electrodes can provide logical functions of the applied voltages.