Giant Resistivity Change of Transparent ZnO/Muscovite Heteroepitaxy

Min Yen, Yu Hong Lai, Chun Li Zhang, Hou Yung Cheng, Yi Ting Hsieh, Jhih Wei Chen, Yi Chun Chen, Li Chang, Nien Ti Tsou, Jiang Yu Li, Ying Hao Chu

Research output: Contribution to journalArticlepeer-review

Abstract

The piezoresistive effect has shown a remarkable potential for mechanical sensor applications and been sought for its excellent performance. A great attention was paid to the giant piezoresistive effect and sensitivity delivered by silicon-based nanostructures. However, low thermal stability and complicated fabrication process hinder their practical applications. To overcome these issues and enhance the functionalities, we envision the substantial piezopotential in a zinc oxide (ZnO)/muscovite (mica) heteroepitaxy system based on theoretical consideration and realize it in practice. High piezoresistive effect with giant change of resistivity (-80 to 240%) and large gauge factor (>1000) are demonstrated through mechanical bending. The detailed features of heteroepitaxy, electrical transport, and strain are probed to understand the mechanism of such a giant resistivity change. In addition, a bending model is established to reveal the distribution of strain. Finally, we demonstrate a flex sensor featuring high sensitivity, optical transparency, and two-segment sensing with a great potential toward practical applications. Such an oxide heteroepitaxy exhibits excellent piezoresistive properties and mechanical flexibility. In the near future, the importance of flex sensors will emerge because of the precise control in the automation industries, and our results lead to a new design in the field of flex sensors.

Original languageEnglish
Pages (from-to)21818-21826
Number of pages9
JournalACS Applied Materials and Interfaces
Volume12
Issue number19
DOIs
Publication statusPublished - 2020 May 13

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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