CuO–TiO2 based self-powered broad band photodetector

Ghosh, Chiranjib; Dey, Arka; Biswas, Iman; Gupta, Rajeev Kumar; Yadav, Vikram Singh; Yadav, Ashish; Yadav, Neha; Zheng, Hongyu; Henini, Mohamed; Mondal, Aniruddha

Abstract

An efficient room-temperature self-powered, broadband (300 ​nm–1100 nm) photodetector based on a CuO–TiO2/TiO2/p-Si(100) heterostructure is demonstrated. The CuO–TiO2 nanocomposites were grown in a two-zone horizontal tube furnace on a 40 ​nm TiO2 thin film deposited on a p-type Si(100) substrate. The CuO–TiO2/TiO2/p-Si(100) devices exhibited excellent rectification characteristics under dark and individual photo-illumination conditions. The devices showed remarkable photo-response under broadband (300–1100 ​nm) light illumination at zero bias voltage, indicating the achievement of highly sensitive self-powered photodetectors at visible and near-infrared light illuminations. The maximum response of the devices is observed at 300 ​nm for an illumination power of 10 ​W. The response and recovery times were calculated as 86 ​ms and 78 ​ms, respectively. Moreover, under a small bias, the devices showed a prompt binary response by altering the current from positive to negative under illumination conditions. The main reason behind this binary response is the low turn-on voltage and photovoltaic characteristics of the devices. Under illumination conditions, the generation of photocurrent is due to the separation of photogenerated electron-hole pairs within the built-in electric field at the CuO–TiO2/TiO2 interface. These characteristics make the CuO–TiO2/TiO2 broadband photodetectors suitable for applications that require high response speeds and self-sufficient functionality.

Citation

Ghosh, C., Dey, A., Biswas, I., Gupta, R. K., Yadav, V. S., Yadav, A., …Mondal, A. (2024). CuO–TiO2 based self-powered broad band photodetector. Nano Materials Science, 6(3), 345-354. https://doi.org/10.1016/j.nanoms.2023.11.003

• Journal Article Type: Article
• Acceptance Date: Nov 7, 2023
• Online Publication Date: Nov 24, 2023
• Publication Date: 2024-06
• Deposit Date: Dec 9, 2023
• Publicly Available Date: Dec 10, 2023
• Journal: Nano Materials Science
• Electronic ISSN: 2589-9651
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 6
• Issue: 3
• Pages: 345-354
• DOI: https://doi.org/10.1016/j.nanoms.2023.11.003
• Keywords: Self-powered; CuO–TiO2 nanocomposite; Broadband photodetector; Two-zone horizontal tube furnace; Responsivity
• Public URL: https://nottingham-repository.worktribe.com/output/28133196
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S2589965123000715?via%3Dihub