Opto-electronic coupling in semiconductors: Towards ultrasensitive pressure sensing

Nguyen, Thanh and Dinh, Toan ORCID: https://orcid.org/0000-0002-7489-9640 and Phan, Hoang-Phuong and Nguyen, Tuan-Khoa and Foisal, Abu Riduan Md and Nguyen, Nam-Trung and Dao, Dzung Viet (2020) Opto-electronic coupling in semiconductors: Towards ultrasensitive pressure sensing. Journal of Materials Chemistry C, 8 (14). pp. 4713-4721. ISSN 2050-7526


Abstract

The discovery of a giant piezoresistive effect in a semiconductor heterojunction by optoelectronic coupling can open a new era for mechanical sensors. This paper develops a novel concept of opto-electronic coupling in semiconductor heterojunctions for pressure sensing. We employ non-uniform illumination of visible light on a SiC/Si heterojunction to generate a gradient of charge carriers in the SiC nanofilm. These charge carriers are then manipulated by a tuning current, producing giant relative resistance changes in the material under applied pressure. We successfully demonstrated the enhancement by opto-electronic coupling in a SiC/Si heterojunction pressure sensor of sensitivity up to 185[thin space (1/6-em)]000 times compared to the unilluminated condition. In addition, the opto-electronic coupling enables significantly improved repeatability, stability, signal-to-noise ratio and detectable range of the pressure sensor. The ultrahigh sensitive pressure sensing mechanism by opto-electronic coupling will pave a way for development of extremely sensitive mechanical sensors


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 -)
Date Deposited: 13 Aug 2020 01:37
Last Modified: 31 Aug 2020 01:20
Uncontrolled Keywords: Sensor; skin; piezoresistance; transparent; platform; energy
Fields of Research (2008): 09 Engineering > 0913 Mechanical Engineering > 091306 Microelectromechanical Systems (MEMS)
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: https://doi.org/10.1039/d0tc00229a
URI: http://eprints.usq.edu.au/id/eprint/39091

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