Optical properties of mesoporous 4H-SiC prepared by anodic electrochemical etching

Rashid, M.; Horrocks, B.R.; Healy, N.; Goss, J.P.; Horsfall, A.B.

Abstract

Porous silicon carbide was fabricated from n-type 4H-SiC substrates via anodic electrochemical etching in HF/ethanol solution and suspended in ethanol after ultrasonication. We observed three photoluminescence bands: two at wavelengths of 303 nm and 345 nm were above the bulk bandgap and one at 455 nm was below the bulk bandgap. These blue-shifted and red-shifted emission processes reveal the interplay between quantum confinement, surface states, and band edge related optical transitions. We propose a model to explain the frequently observed deviation from the quantum confinement in the photoluminesence trends for SiC-derived nanoparticles suspended in solvents. The quantum confined properties of the SiC structures provide a route for optical tunability in the UV-blue spectrum for use in novel photonic and biomedical applications.

Citation

Rashid, M., Horrocks, B., Healy, N., Goss, J., & Horsfall, A. (2016). Optical properties of mesoporous 4H-SiC prepared by anodic electrochemical etching. Journal of Applied Physics, 120(19), Article 194303. https://doi.org/10.1063/1.4968172

• Journal Article Type: Article
• Acceptance Date: Nov 7, 2016
• Online Publication Date: Nov 18, 2016
• Publication Date: Nov 21, 2016
• Deposit Date: Oct 1, 2018
• Publicly Available Date: Oct 2, 2018
• Journal: Journal of Applied Physics
• Print ISSN: 0021-8979
• Electronic ISSN: 1089-7550
• Publisher: American Institute of Physics
• Peer Reviewed: Peer Reviewed
• Volume: 120
• Issue: 19
• Article Number: 194303
• DOI: https://doi.org/10.1063/1.4968172
• Public URL: https://durham-repository.worktribe.com/output/1347275