Self-powered flexible touch sensors based on PZT thin films using laser lift-off

Myoung Sub Noh, Sangtae Kim, Do Kyung Hwang, Chong Yun Kang

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Touch screens have become an inherent part of the user interface in many electronics applications such as smartphones. The two types of developed touch sensors, the resistive and capacitive sensing devices, may face several difficulties when applied to flexible device applications such as touch signals arising from bending motions. In this study, we assess the feasibility of flexible touch sensors based on piezoelectric PbZr0.52Ti0.48O3 (PZT) thin films. Piezoelectric ceramic based flexible touch sensors possess unique advantages including scalable fabrication, fast response time, durability, and being self-powered. A demonstration device has been fabricated with a sandwich structure consisting of Pt electrode/functional PZT/Pt electrode/flexible substrate structure using laser lift-off (LLO) method. In order to anneal the functional PZT layer at high temperature (600 °C), the device was first fabricated on the sapphire substrate and transferred via melting sacrificial PZT layer with an excimer laser. We demonstrate the detection of x- and y-axis touch location via piezoelectric materials and confirm that the flexible piezoelectric touch sensors can distinguish between touch-induced and bending-induced signals via signal location, signal shape, and duration time. A notable feature of this fabrication technique involves its possibility to be fabricated in high resolution. This device may potentially achieve high resolution with suitable fabrication techniques, thus, providing the possibility for the next generation touch sensors.

Original languageEnglish
Pages (from-to)288-294
Number of pages7
JournalSensors and Actuators, A: Physical
Volume261
DOIs
Publication statusPublished - 2017 Jul 1

Bibliographical note

Funding Information:
This research was supported by the Industry Technology R&D Program of the Ministry of Trade, Industry and Energy/Korea Evaluation Institute of Industrial Technology (MOTIE/KEIT) (Development of mechanical UI device core technology for small and medium-sized flexible display, Project no. 10051080), the Energy Technology Development Project (KETEP) grant funded by the Ministry of Trade, Industry and Energy, Republic of Korea (Piezoelectric Energy Harvester Development and Demonstration for Scavenging Energy from the Road Traffic system, Project no. 20142020103970), the Institutional Research Program of the Korea Institute of Science and Technology (2E27120), and KU-KIST Research Program of Korea University (R1309521).

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

  • Flexible piezoelectric touch sensors
  • Laser lift-off (LLO)
  • PZT

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering

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