Flexible Piezoelectric Array Structure for Bend-Resistant Ceramics
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Solution Overview
Problem
Conventional piezoelectric devices using ceramic materials lack flexibility and are prone to fracture when bent, limiting their application in flexible and miniaturized devices due to the rigidity of the materials and their inability to accommodate bending without stress.
Innovation Solution
A piezoelectric device comprising a flexible substrate with piezoelectric units arranged in an array, where each unit consists of a first electrode, a piezoelectric component made from a rigid material like lead-zirconate-titanate ceramic, and a second electrode, with specific electrode structures and fabrication methods that allow for stress distribution and bending properties, including the use of adhesion and passivation layers and thin-film transistors for control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If piezoelectric ceramics are used as the piezoelectric material, then high piezoelectric efficiency is achieved, but the device becomes rigid and prone to fracture when bent
Solution Approach 1:
The piezoelectric device is segmented into multiple independent piezoelectric units arranged in an array on a flexible substrate. Each unit consists of rigid piezoelectric ceramic components but is electrically and structurally independent, allowing the overall device to flex while individual units remain intact and functional.
Solution Approach 2:
A flexible substrate is used to support the array of piezoelectric units. The substrate acts as a flexible carrier that distributes mechanical stress across the entire device, enabling the rigid piezoelectric ceramic components to maintain their high efficiency while the overall device achieves flexibility and fracture resistance through the compliant substrate.
2Power
If rigid piezoelectric ceramic materials are used, then high piezoelectric performance is achieved, but the device cannot accommodate bending without stress concentration
Solution Approach 1:
The device is divided into multiple discrete piezoelectric units that are spatially separated and independently mounted on the flexible substrate. This segmentation allows each rigid ceramic unit to maintain its high performance while the flexible substrate absorbs bending stresses, preventing stress concentration in individual units.
Solution Approach 2:
The device structure transitions from a rigid monolithic form to a dynamic array configuration where the flexible substrate can adapt its shape during bending. The piezoelectric units remain rigid for optimal performance but are positioned on a dynamic flexible substrate that accommodates various bending states without compromising the rigid components.
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 a piezoelectric device with enhanced flexibility and reduced risk of fracture, achieving high-efficiency piezoelectricity and flexible sensor capabilities, allowing for miniaturization and extensive application in sensing and transducer applications.
Implementation Method 1
Piezoelectric devices refer to devices that are fabricated by using the piezoelectric effect of materials
Data Source
AI summary
A piezoelectric device and a fabricating method thereof, and an electronic device and a controlling method thereof, which relates to the technical field of piezoelectric devices. The piezoelectric device includes: a flexible substrate and a plurality of piezoelectric units that are provided on the flexible substrate and are arranged in an array; each of the plurality of piezoelectric units includes: a first electrode, a piezoelectric component and a second electrode that are sequentially stacked on the flexible substrate; and the piezoelectric component is made from a rigid material. The present disclosure is suitable for the fabrication of piezoelectric devices.