Electromechanical Switching Device Using 2D Layered Materials

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Solution Overview

Problem

Current miniaturized CMOS-based transistors and recent switching devices fail to achieve ideal switching properties due to low on/off ratios and large device dimensions, limiting their application in logic and memory operations.

Innovation Solution

An electromechanical switching device utilizing 2D layered materials with anisotropic electrical conductivity, featuring distinct structural, electrical, and magnetic properties, and an actuation mechanism that modifies transverse electrical conductance between electrodes to enable current modulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If current miniaturized CMOS-based transistors are used, then device dimensions are reduced, but switching properties deteriorate (low on/off ratios and gradual transitions)

Engineering Contradiction:

Improvedevice dimensionsVSAvoidswitching properties

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent replaces the electrical field control mechanism of CMOS transistors with a mechanical actuation system that physically moves electrodes relative to 2D layered material layers. This mechanical substitution enables abrupt switching through direct contact or near-contact between electrodes and 2D materials, achieving high on/off ratios (>10^10) while maintaining miniaturized dimensions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent exploits changes in electrical conductance parameters of 2D layered materials through mechanical displacement. By controlling the distance and relative position between electrodes and 2D material layers, the device achieves dramatic changes in electrical properties (from conductive to insulating states), enabling ideal switching behavior in a miniaturized form factor.

Inventive Principle:

Principle #35Parameter changes

2Speed

If recent switching device concepts are used, then abrupt switching is achieved, but on currents become low

Engineering Contradiction:

Improveswitching abruptnessVSAvoidon currents

Core Design Contradiction:

SpeedVSPower

Solution Approach 1:

The patent employs composite structures combining 2D layered materials (such as graphene, transition metal dichalcogenides) with electrode materials and dielectric layers. This composite architecture enables both abrupt switching through the 2D material's unique properties and high on currents through the conductive pathways provided by the electrode-2D material interfaces and lateral conduction channels.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes the two-dimensional nature of layered materials to create switching mechanisms that operate in the lateral dimension rather than purely vertical transport. This dimensional approach allows current to flow laterally through wide contact areas between electrodes and 2D materials, maintaining high on currents while achieving abrupt switching through vertical displacement control.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

The device achieves abrupt switching with high on/off ratios, suitable for scaled-down applications in logic and memory circuits, offering improved switching properties and reliability.

Implementation Method 1

each of the first and second 2D layered materials has an anisotropic electrical conductivity, which is lower transversely to its layers than in-plane with the layers

Methodology Applied

Scientific EffectAnisotropic electrical conductivity: Anisotropy

Implementation Method 2

actuation of at least one of the first electrode and the second electrode modifies an electrical conductance transverse to each of the first surface and the second surface to enable current modulation between the first electrode and the second electrode

Methodology Applied

Scientific EffectElectrical conductance modulation through mechanical actuation: Conduction (electrical)

Data Source

PatentUS10546708B2Electromechanical switching device with electrodes having 2D layered materials with distinct functional areas

Publication Date: 2020.01.28 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

An electromechanical switching device includes a first electrode, comprising layers of a first 2D layered material, which layers exhibit a first surface; a second electrode, comprising layers of a second 2D layered material, which layers exhibit a second surface opposite the first surface; and an actuation mechanism; wherein each of the first and second 2D layered materials has an anisotropic electrical conductivity, which is lower transversely to its layers than in-plane with the layers; the first electrode includes two distinct areas alongside the first surface, which areas differ in at least one structural, electrical and/or magnetic property; and at least one of the first and second electrodes is actuatable by the actuation mechanism, such that actuation thereof for modification of an electrical conductance transverse to each of the first surface and the second surface to enable current modulation between the first electrode and the second electrode.