Flexible Piezoelectric Generator Seed Layer Short Circuit Prevention
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Solution Overview
Problem
Existing piezoelectric generators face challenges in manufacturing large-area flexible devices due to issues with short circuits and non-uniform particle adsorption, which affect power generation performance, especially when using inexpensive metal substrates like aluminum foil and hydrothermal processes.
Innovation Solution
A piezoelectric generator design featuring thin polymer insulation layers on flexible electrodes and substrates, with a seed layer facilitating uniform growth of piezoelectric nanowires or thin films, preventing short circuits and enhancing power generation while allowing for cost-effective, large-area production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thin polymer insulation layers are used on flexible electrodes, then flexibility and cost are improved, but risk of short circuits increases
Solution Approach 1:
A seed layer is introduced as an intermediary between the insulation layer and piezoelectric nanowires. This seed layer serves as a mediator that facilitates uniform nanowire growth while maintaining the thin insulation layer structure, thereby preventing short circuits without requiring thicker insulation layers that would increase cost and reduce flexibility.
Solution Approach 2:
The insulation layer thickness is optimized to a specific thin range (specified as thin polymer insulation layers) rather than using conventional thicker layers. This parameter change reduces material cost and maintains flexibility while the seed layer compensates for the reduced insulation distance by ensuring uniform nanowire growth that prevents direct contact between electrodes.
2Ease of manufacture
If hydrothermal process is used with inexpensive metal substrates, then cost is reduced, but uniformity of particle adsorption deteriorates
Solution Approach 1:
The seed layer is applied beforehand to the insulation layer before the hydrothermal process. This preliminary action prepares the surface with uniform nucleation sites that guide the subsequent growth of piezoelectric nanowires, ensuring uniform particle adsorption even when using inexpensive metal substrates like aluminum foil.
Solution Approach 2:
The seed layer acts as an intermediary between the inexpensive metal substrate and the piezoelectric nanowires. It mediates the interaction by providing a uniform surface that promotes consistent nanowire growth, overcoming the non-uniform particle adsorption that would otherwise occur on inexpensive metal substrates during the hydrothermal process.
3Productivity
If large-area flexible piezoelectric generators are manufactured, then productivity is improved, but maintaining uniform quality and preventing short circuits becomes more difficult
Solution Approach 1:
The seed layer is deposited across the entire large-area substrate before the hydrothermal process. This preliminary action ensures that uniform nucleation sites are established over the whole area, enabling consistent and uniform nanowire growth across large surfaces while maintaining quality control and preventing short circuits throughout the entire device area.
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 the effective generation of electric energy from mechanical vibrations and movements, with improved power generation performance and cost efficiency, as demonstrated by attachment to flags and facial skin experiments.
Implementation Method 1
Piezoelectric generators among devices for harvesting energy may be considered as environmentally friendly energy generating devices which may transform mechanical energy generated by vibration existing in a surrounding environment or the motion of the human body into electric energy
Implementation Method 2
growing piezoelectric nanowires on the first insulation layer by using a hydrothermal process
Data Source
AI summary
Provided are flexible piezoelectric generators and methods of manufacturing the same. The piezoelectric generator includes a first insulation layer disposed on a first electrode, a piezoelectric structure disposed on the first insulation layer, a second insulation layer disposed on the piezoelectric structure, and a second electrode disposed on the second insulation layer.