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Title: Highly transparent ITO/HfO2/ITO device for visible-light sensing
Authors: Kalaga, Pranav Sairam
Kumar, Dayanand
Ang, Diing Shenp
Tsakadze, Zviad
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2020
Source: Kalaga, P. S., Kumar, D., Ang, D. S. & Tsakadze, Z. (2020). Highly transparent ITO/HfO2/ITO device for visible-light sensing. IEEE Access, 8, 91648-91652.
Project: MOE2016-T2-2-102
Journal: IEEE Access
Abstract: Transparent visible-light sensors are of critical importance in invisible optoelectronic circuits as the interface between the optical and electrical domains. However, devices designed based on photocarrier generation for light sensing limit the transparency of the device in the visible region, as the optically active layer also passively absorbs light continuously. In this work, we present an all-transparent ITO/HfO 2 /ITO device with the wide bandgap HfO 2 functioning as the resistive switching and the light sensing element. Electrically switching the resistive state of the device to a low-resistance soft-breakdown state is demonstrated to cause the wide-bandgap visible-light blind HfO 2 to become photoresponsive. This allows us to optically functionalize the device for an optical response by electrical breakdown in the oxide and can be triggered on-demand. Apart from the on-demand optical response in the device, the inherent resistive switching properties of the HfO 2 device allow for integration of memory and optical sensing capabilities, presenting a novel phenomenon for optical sensing in invisible optoelectronics.
ISSN: 2169-3536
DOI: 10.1109/ACCESS.2020.2994383
Schools: School of Electrical and Electronic Engineering 
Rights: © 2020 IEEE. This journal is 100% open access, which means that all content is freely available without charge to users or their institutions. All articles accepted after 12 June 2019 are published under a CC BY 4.0 license, and the author retains copyright. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles, or use them for any other lawful purpose, as long as proper attribution is given.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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