Nano-Piezoelectric Generator with Insulating Interlayer
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Solution Overview
Problem
Conventional piezoelectric generators, such as those using lead zirconate titanate (PZT) and barium titanium oxide (BTO), are not suitable for nano-wiring and pose health risks, while existing nano-piezoelectric materials like ZnO and GaN require improved efficiency and suitable electrode materials to enhance piezoelectric performance.
Innovation Solution
A nano-piezoelectric generator design featuring a semiconductor piezoelectric material with a nano-structure, an insulating interlayer, and a density adjusting unit, where the interlayer is made of materials like WO3, HfO2, and the nano-piezoelectric units are formed with ZnO or GaN, and a density adjusting unit is used to control carrier density, improving piezoelectric efficiency and reducing interface leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional piezoelectric materials (PZT, BTO) are used, then piezoelectric efficiency is maintained, but health risks increase and suitability for nano-wiring decreases
Solution Approach 1:
The patent changes the material parameters by transitioning from conventional bulk piezoelectric materials (PZT, BTO) to semiconductor piezoelectric materials (ZnO, GaN) with nano-structures. This parameter change enables both improved health safety and suitability for nano-wiring applications while maintaining piezoelectric efficiency.
Solution Approach 2:
The patent employs composite material structures by combining semiconductor piezoelectric materials with insulating interlayers and electrode materials. This composite approach creates a nano-piezoelectric generator that is both safe for human health and suitable for nano-wiring while achieving high piezoelectric efficiency.
2Power
If strain is dispersed in bulk structure, then stress distribution is improved, but piezoelectric efficiency decreases
Solution Approach 1:
The patent transitions from three-dimensional bulk structures to one-dimensional nano-wire structures. This dimensional change confines strain to the length direction of the nano-wires, preventing strain dispersion in other directions and significantly improving piezoelectric efficiency.
Solution Approach 2:
The patent applies local quality by creating nano-structures where strain confinement is localized to specific regions (the nano-wires). This local structural organization ensures that strain is concentrated in the length direction where it generates piezoelectric effect, rather than being dispersed throughout the bulk material.
3Adaptability or versatility
If electrode material selection is limited, then interface leakage current is reduced, but material selection range decreases
Solution Approach 1:
The patent introduces an insulating interlayer as an intermediary between the electrode and the piezoelectric nano-structure. This interlayer acts as a mediator that prevents direct contact between the electrode and piezoelectric material, thereby reducing interface leakage current while allowing broader electrode material selection.
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 design significantly enhances piezoelectric efficiency by restricting strain to the length direction of nano-wires, allowing for higher piezoelectric coefficients and improved energy conversion, while also expanding the selection range of electrode materials and reducing leakage currents.
Implementation Method 1
Piezoelectric generators are devices for converting mechanical vibrations into electrical energy
Implementation Method 2
in a nano-structure, and in particular, in a nano-wire structure, that is, a one-dimensional nano-structure, strain is restricted to only a length direction of the nano-wire structure in which stress is applied, and thus a high piezoelectric coefficient may be obtained
Data Source
AI summary
A nano-piezoelectric generator includes a first electrode and a second electrode, at least one nano-piezoelectric unit, formed of a semiconductor piezoelectric material having a nano-structure, disposed between the first and the second electrodes, and an interlayer, formed of an insulating material, disposed between the first electrode and the at least one nano-piezoelectric unit.