Piezoelectric Thin Film Manufacturing via Nanosheet Seed Layer
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Solution Overview
Problem
Existing piezoelectric thin films face challenges in being applied to flexible and transparent devices due to high heat treatment temperatures, leading to amorphous structures with low piezoelectric characteristics, and existing transfer processes damage the films, limiting their application in display panels and other devices.
Innovation Solution
A method involving the formation of a two-dimensional perovskite nanosheet seed layer on a substrate followed by a ceramic piezoelectric thin film using a Langmuir-Blodgett process and physical vapor deposition at low temperatures, allowing for the creation of piezoelectric thin films with specific crystal structures on polymer substrates without heat damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature deposition and heat treatment processes are used to form piezoelectric thin films with perovskite structure, then piezoelectric characteristics are improved, but application to flexible and transparent devices is limited due to substrate damage and process complexity
Solution Approach 1:
The patent changes the temperature parameter from conventional high-temperature (500°C or more) deposition to low-temperature (room temperature to 450°C) deposition. This parameter change enables the formation of piezoelectric thin films with perovskite structure on flexible and transparent substrates that cannot withstand high temperatures, while still achieving sufficient piezoelectric characteristics through the use of a nanosheet seed layer
Solution Approach 2:
The patent introduces a nanosheet seed layer as an intermediary between the substrate and the piezoelectric thin film. This seed layer serves as a template that guides the formation of the perovskite structure during low-temperature deposition, enabling crystallization without high-temperature heat treatment and thus making the process compatible with flexible and transparent substrates
2Adaptability or versatility
If low-temperature deposition is used to avoid substrate damage, then adaptability to flexible devices is improved, but piezoelectric characteristics deteriorate due to amorphous structure formation
Solution Approach 1:
The nanosheet seed layer acts as a mediator that enables low-temperature deposition while preventing amorphous structure formation. The seed layer provides a pre-formed crystalline template that guides the deposition process, allowing the piezoelectric thin film to crystallize at low temperatures and maintain high piezoelectric characteristics without requiring high-temperature heat treatment
Solution Approach 2:
The patent performs preliminary action by forming a nanosheet seed layer with the desired perovskite crystal structure before depositing the piezoelectric thin film. This preliminary crystalline structure serves as a template that directs the subsequent low-temperature deposition process, ensuring that the final film achieves the necessary crystal orientation and piezoelectric properties without high-temperature processing
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
This approach enables the production of piezoelectric thin films with high piezoelectric characteristics and specific crystal orientations at low temperatures, suitable for flexible and transparent devices, maintaining excellent properties even when bent, and preventing volatilization of perovskite elements during deposition.
Implementation Method 1
forming a ceramic piezoelectric thin film on the two-dimensional perovskite nanosheet seed layer
Implementation Method 2
A piezoelectric material, which has a characteristics of being capable of interconverting electrical energy and mechanical energy applied thereto
Data Source
AI summary
Disclosed are a method of manufacturing a piezoelectric thin film and a piezoelectric sensor manufactured using the piezoelectric thin film. A piezoelectric sensor according to an embodiment of the present disclosure includes a substrate; a lower electrode formed on the substrate; a two-dimensional perovskite nanosheet seed layer formed on the lower electrode; a ceramic piezoelectric thin film formed on the two-dimensional perovskite nanosheet seed layer; and an upper electrode formed on the ceramic piezoelectric thin film, wherein each of the two-dimensional perovskite nanosheet seed layer and the ceramic piezoelectric thin film has a crystal structure.