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Double-gate thin film transistor with suspended-gate applicable to tactile force sensor
An Hoang-Thuy Nguyen1, Manh-Cuong Nguyen1, Seongyong Cho1
1Department of Materials Science and Engineering, Inha University, Incheon, 22212, South Korea.
Nano Convergence
|September 15, 2020
Summary
This study introduces a simple method to create highly sensitive tactile force sensors using membrane gate thin-film transistors (TFTs) with an air gap. These sensors detect force by measuring changes in the TFT
Area of Science:
- Materials Science
- Electrical Engineering
- Sensor Technology
Background:
- Thin-film transistors (TFTs) are widely used in electronics.
- Developing highly sensitive and low-cost sensors is crucial for various applications.
- Integrating novel structures into TFT fabrication can enhance sensor performance.
Purpose of the Study:
- To present a straightforward, low-cost fabrication process for membrane gate TFTs with an air gap.
- To demonstrate the application of these devices as highly sensitive tactile force sensors.
- To investigate methods for optimizing sensor sensitivity.
Main Methods:
- Fabrication of membrane gate TFTs with an air gap using photolithography and sacrificial photoresist layers.
- Modification of air gap thickness by controlling photoresist viscosity and spin coating speed.
- Tactile force sensing by monitoring TFT drain current changes due to air gap deformation.
- Optimization of device sensitivity through gate size and gate material's Young's modulus.
Main Results:
- Successful fabrication of membrane gate TFTs with an integrated air gap insulator.
- Demonstrated correlation between applied tactile force and changes in TFT drain current.
- Enhanced sensor sensitivity achieved with optimal gate dimensions and low Young's modulus materials.
- The developed process is simple, low-cost, and effective.
Conclusions:
- The proposed fabrication process enables the creation of highly sensitive tactile force sensors.
- Membrane gate TFTs with air gaps offer a promising platform for versatile and miniature sensor development.
- This technology has potential for scalable production of advanced tactile sensors.
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