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Molecules 2018, 23(9), 2296; https://doi.org/10.3390/molecules23092296

Strong Coupling of Folded Phonons with Plasmons in 6H-SiC Micro/Nanocrystals

1
National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, China
2
National Laboratory of Solid State Microstructures and Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093, China
*
Authors to whom correspondence should be addressed.
Received: 4 August 2018 / Revised: 23 August 2018 / Accepted: 2 September 2018 / Published: 8 September 2018
(This article belongs to the Special Issue Raman Spectroscopy: A Spectroscopic 'Swiss-Army Knife')
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Abstract

Silicon carbide (SiC) has a large number of polytypes of which 3C-, 4H-, 6H-SiC are most common. Since different polytypes have different energy gaps and electrical properties, it is important to identify and characterize various SiC polytypes. Here, Raman scattering is performed on 6H-SiC micro/nanocrystal (MNC) films to investigate all four folded transverse optic (TO) and longitudinal optic (LO) modes. With increasing film thickness, the four folded TO modes exhibit the same frequency downshift, whereas the four folded LO modes show a gradually-reduced downshift. For the same film thickness, all the folded modes show larger frequency downshifts with decreasing MNC size. Based on plasmons on MNCs, these folded modes can be attributed to strong coupling of the folded phonons with plasmons which show different strengths for the different folded modes while changing the film thickness and MNC size. This work provides a useful technique to identify SiC polytypes from Raman scattering. View Full-Text
Keywords: SiC micro/nanocrystals; plasmon–phonon coupling; folded phonons SiC micro/nanocrystals; plasmon–phonon coupling; folded phonons
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Huang, Y.; Yang, R.; Xiong, S.; Chen, J.; Wu, X. Strong Coupling of Folded Phonons with Plasmons in 6H-SiC Micro/Nanocrystals. Molecules 2018, 23, 2296.

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