Integrated Electro-Mechanical Actuator With Inclined Electrodes
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Solution Overview
Problem
Nano-Electro-Mechanical switches face challenges in achieving high switching speed and low actuation voltage while maintaining a narrow gap between electrodes, which is difficult to control and define even with state-of-the-art lithography technology.
Innovation Solution
An integrated electro-mechanical actuator with an electrostatic actuator gap and an electrical contact gap, where an inclination angle is provided between the actuator and contact electrodes, allowing the gap dimensions to be defined by the thickness of a sacrificial layer and the inclination angle, enabling precise control of the switching mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the gap between electrodes is reduced to achieve high switching speed and low actuation voltage, then switching performance is improved, but manufacturing precision and gap control become more difficult
Solution Approach 1:
The patent transitions from controlling gap size through lithographic patterning (2D plane) to controlling gap size through sacrificial layer thickness (3D vertical dimension). This dimensional shift allows precise gap definition via thin film deposition processes, achieving sub-10nm control that is difficult to obtain through lithography alone.
Solution Approach 2:
The patent introduces a sacrificial layer as an intermediary material that temporarily occupies the gap space during fabrication. This mediator enables indirect gap definition: the sacrificial layer is deposited to a precise thickness, then removed to create the final gap. This approach decouples gap dimension control from direct lithographic patterning, achieving superior precision.
2Use of energy by moving object
If the gap between electrodes is reduced to achieve low actuation voltage, then power efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary action by depositing the sacrificial layer to the exact desired gap thickness before any gap formation occurs. This pre-definition of gap dimension through controlled thin film deposition simplifies subsequent fabrication steps and ensures precise gap control, reducing overall manufacturing complexity despite the additional deposition process.
Solution Approach 2:
The patent changes the controlling parameter for gap dimension from lithographic features (lateral dimensions) to sacrificial layer thickness (vertical dimension). This parameter transformation enables precise gap control through well-established thin film deposition techniques, achieving low actuation voltage while maintaining manageable manufacturing complexity.
3Reliability
If the gap between electrodes is reduced to achieve high on-current, then device performance is improved, but gap definition difficulty increases
Solution Approach 1:
The sacrificial layer serves as an intermediary that enables precise gap definition for achieving high on-current. By depositing the sacrificial layer to a controlled thickness and then removing it, the patent creates well-defined gaps with precise dimensions, ensuring reliable electrical contact when switches are actuated while maintaining the narrow gap needed for high on-current.
Solution Approach 2:
The patent moves gap definition from the lateral dimension (lithography) to the vertical dimension (thin film deposition). This dimensional transition enables superior gap precision through controlled deposition thickness, ensuring the narrow, well-defined gaps necessary for high on-current while avoiding the resolution limits of lithographic techniques.
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 solution allows for high on-current, low off-current, high switching speed, and a small footprint, with actuation voltage less than 1 V, and is easily interfaced with CMOS devices, achieving almost zero leakage current and steep sub-threshold slope with nanosecond mechanical delay.
Implementation Method 1
A Nano-Electro-Mechanical switch having a narrow gap between electrodes is controlled by electrostatic actuation. In response to an electrostatic force a contact electrode can be bent to contact another electrode thus closing a switch.
Data Source
AI summary
The present invention provides an integrated electro-mechanical actuator and a manufacturing method for manufacturing such an integrated electro-mechanical actuator. The integrated electro-mechanical actuator comprises an electrostatic actuator gap between actuator electrodes and an electrical contact gap between contact electrodes. An inclination with an inclination angle is provided between the actuator electrodes and the contact electrodes. The thickness of this electrical contact gap is equal to the thickness of a sacrificial layer which is etched away in a manufacturing process.