Investigation of optical and electrical properties of erbium-doped TiO2 thin films for photodetector applications

Mondal, Sanjib; Ghosh, Anupam; Rizzo Piton, M.; Gomes, Joaquim P.; Felix, Jorlandio F.; Galv�o Gobato, Y.; Avan�o Galeti, H.V.; Choudhuri, B.; Dhar Dwivedi, S.M.M.; Henini, M.; Mondal, Aniruddha

Abstract

We have investigated the electrical and optical properties of erbium (Er3+) doped TiO2 thin films (Er:TiO2 TFs) grown by sol–gel technique on glass and silicon substrates. The samples were characterized by field emission gun–scanning electron microscopes (FEG–SEM), energy dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), X-ray diffraction (XRD), photoluminescence (PL) and current–voltage measurement techniques. FEG–SEM and AFM images showed the morphological change in the structure of Er:TiO2 TFs and EDX analysis confirmed the Er3+ doped into TiO2 lattice. Broad PL emissions in visible and infrared regions were observed in undoped TiO2 samples and associated to different mechanisms due to the anatase and rutile phases. PL spectra revealed sharp peaks at 525 nm, 565 nm, 667 nm and 1.54 µm which are related to Er3+ emissions in Er:TiO2 samples. The undoped TiO2 and Er:TiO2 TFs based UV-photodetectors were fabricated, and various device parameters were investigated. The doped devices exhibit high photoresponse upon illuminating 350 nm UV light at 2 V bias with faster response time compared to undoped device.

Citation

Mondal, S., Ghosh, A., Rizzo Piton, M., Gomes, J. P., Felix, J. F., Galvão Gobato, Y., Avanço Galeti, H., Choudhuri, B., Dhar Dwivedi, S., Henini, M., & Mondal, A. (2018). Investigation of optical and electrical properties of erbium-doped TiO2 thin films for photodetector applications. Journal of Materials Science: Materials in Electronics, 29(22), 19588–19600. https://doi.org/10.1007/s10854-018-0090-1

• Journal Article Type: Article
• Acceptance Date: Sep 19, 2018
• Online Publication Date: Sep 22, 2018
• Publication Date: Nov 30, 2018
• Deposit Date: Oct 15, 2018
• Publicly Available Date: Sep 23, 2019
• Journal: Journal of Materials Science: Materials in Electronics
• Print ISSN: 0957-4522
• Electronic ISSN: 1573-482X
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 29
• Issue: 22
• Pages: 19588–19600
• DOI: https://doi.org/10.1007/s10854-018-0090-1
• Keywords: Sol-gel; TiO2 thin film; Er2O3; Photoluminescence; Photodetectors
• Public URL: https://nottingham-repository.worktribe.com/output/1146449
• Publisher URL: https://link.springer.com/article/10.1007/s10854-018-0090-1
• Additional Information: This is a post-peer-review, pre-copyedit version of an article published in Journal of Materials Science: Materials in Electronics. The final authenticated version is available online at: http://dx.doi.org/10.1007/s10854-018-0090-1
• Contract Date: Oct 16, 2018