Pseudo-piezoelectric Vibration Device Using Semiconductor Nano-gaps
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Solution Overview
Problem
Conventional piezoelectric d33 vibration devices face integration challenges with semiconductor manufacturing processes due to contamination, high temperature requirements, and high voltage needs, making it difficult to integrate piezoelectric elements with integrated circuits.
Innovation Solution
A pseudo-piezoelectric d33 vibration device is developed using a semiconductor-metal compound with nano-gaps between electrodes, allowing for easy integration with semiconductor manufacturing processes and operating at standard voltages, eliminating the need for piezoelectric materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional piezoelectric materials (PVDF, PZT) are used for d33 vibration devices, then vibration sensing capability is achieved, but integration with semiconductor manufacturing process becomes difficult due to contamination and high temperature requirements
Solution Approach 1:
The patent extracts the essential function of piezoelectric materials (vibration sensing in d33 mode) and implements it using a purely semiconductor-based structure. The piezoelectric material is completely removed and replaced with a semiconductor layer and metal compound layer structure that can be manufactured using standard semiconductor processes without contamination or high temperature sintering.
Solution Approach 2:
The patent replaces the mechanical piezoelectric effect in traditional materials with an electrostatic-based mechanical system. Instead of relying on piezoelectric material deformation, the invention uses electrostatic force between charged layers to generate and detect vibrations, enabling integration with semiconductor manufacturing.
2Reliability
If PZT is used for d33 operation mode, then vibration function is achieved, but high temperature sintering (700-1000°C) is required which complicates integration with integrated circuits
Solution Approach 1:
The patent fundamentally changes the operating principle from piezoelectric effect to electrostatic effect, and changes the material composition from ceramic PZT to semiconductor and metal compound layers. This parameter change enables operation at standard semiconductor processing temperatures rather than requiring 700-1000°C sintering.
3Reliability
If conventional piezoelectric materials are used, then vibration sensing is achieved, but high voltage (tens to hundreds of volts) is required which complicates system integration
Solution Approach 1:
The patent changes the operating voltage parameter from high voltage (tens to hundreds of volts) to low voltage by using an electrostatic-based system with charged layers. The electrostatic force generated between the charged semiconductor and metal compound layers is sufficient to drive vibrations at much lower voltages, simplifying system integration.
4Reliability
If PZT is used for d33 mode operation, then vibration function is achieved, but manufacturing cost increases due to platinum electrodes and sintering process
Solution Approach 1:
The patent replaces expensive PZT ceramic material and platinum electrodes with standard semiconductor materials and common metal compounds that can be deposited using conventional semiconductor manufacturing techniques. This substitution dramatically reduces material costs while maintaining the vibration sensing function.
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 enables seamless integration with semiconductor processes, reduces manufacturing costs, and operates at lower voltages, enhancing system integration simplicity while maintaining vibration sensing capabilities.
Implementation Method 1
a nano-gap, which is created between the first and second electrodes after a semiconductor-metal compound is formed
Data Source
AI summary
A pseudo-piezoelectric d33 vibration device includes transistors and receivers electrically connected to the transistors. Each transistor controls a corresponding one of the receivers to receive a second vibration wave, generated after an object reflects a first vibration wave, and to generate a sensing signal. Each receiver has a first electrode, a second electrode and a nano-gap, which is created between the first and second electrodes after a semiconductor-metal compound is formed. A display integrating the pseudo-piezoelectric d33 vibration device is also provided.