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Sensitivity Enhancement of Soft Capacitive Pressure Sensors Using a Solvent Evaporation-Based Porosity Control Technique

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Published on: March 24, 2023

Solution process manufacture of a simple, multifunctional flexible sensor based on capacitance measurement.

Kwang Wook Choi¹, Cheol Shin^1,2, Sungwoo Jun¹

¹Display and Nanosystem Laboratory, Department of Electrical Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.

|April 7, 2021

Summary

This study introduces a novel, cost-effective two-layer multi-sensor fabricated via a non-vacuum solution process. This flexible sensor functions as both a touch and light sensor, overcoming limitations of conventional rigid devices.

Keywords:

flexible transparent electrodes multifunctional sensors photo sensors photocapacitive touch sensors

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Area of Science:

Materials Science
Nanotechnology
Sensor Technology

Background:

Conventional sensors are rigid, single-stimulus devices with high manufacturing costs due to complex vacuum-based fabrication.
Multi-layer sensor designs are prone to mechanical failure, limiting their practical applications.
Existing sensors often require intricate processes and specialized equipment, increasing production expenses.

Purpose of the Study:

To develop a simple, low-cost, and versatile multi-sensor using a non-vacuum solution process.
To overcome the limitations of conventional rigid and single-function sensors.
To demonstrate a novel sensor capable of detecting multiple stimuli, specifically light and touch.

Main Methods:

Fabrication of a two-layer sensor using a non-vacuum solution process.
Incorporation of a light absorption layer with polyvinyl butyral and semiconductor particles.
Integration of spiral-shaped silver nanowire electrodes for multi-functional sensing.

Main Results:

The developed multi-sensor exhibits a light-sensitive optical response at 420 nm and 1.2 mW cm^-2.
The sensor demonstrates functionality as both a touch and a light sensor.
Capacitance, light sensitivity, and noise characteristics were analyzed with respect to frequency.

Conclusions:

The proposed non-vacuum solution-processed multi-sensor offers a cost-effective and robust alternative to conventional sensors.
Its dual functionality as a touch and light sensor opens possibilities for diverse applications.
This flexible sensor design minimizes damage from external adhesives and mechanical stress.