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Enhanced Performance of a Visible Light Detector Made with Quasi-Free-Standing Graphene on SiC

The excellent optoelectronic properties of graphene give it great potential for applications in optical detection. Among the graphenes obtained through many synthetic methods, epitaxial graphene obtained by thermal decomposition on silicon carbide has remarkable advantages for preparing photodetecto...

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Detalles Bibliográficos
Autores principales: Li, Xiaomeng, Chen, Xiufang, Xu, Xiangang, Hu, Xiaobo, Zuo, Zhiyuan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6804206/
https://www.ncbi.nlm.nih.gov/pubmed/31581618
http://dx.doi.org/10.3390/ma12193227
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author Li, Xiaomeng
Chen, Xiufang
Xu, Xiangang
Hu, Xiaobo
Zuo, Zhiyuan
author_facet Li, Xiaomeng
Chen, Xiufang
Xu, Xiangang
Hu, Xiaobo
Zuo, Zhiyuan
author_sort Li, Xiaomeng
collection PubMed
description The excellent optoelectronic properties of graphene give it great potential for applications in optical detection. Among the graphenes obtained through many synthetic methods, epitaxial graphene obtained by thermal decomposition on silicon carbide has remarkable advantages for preparing photodetectors. In this research, epitaxial graphene has been successfully prepared on a silicon surface (0001) of semi-insulating 4H-SiC substrate with a size of 10 mm × 10 mm and epitaxial graphene has been converted to quasi-free-standing graphene by hydrogen passivation. Two metal-graphene-metal photodetectors were fabricated using the two types of graphenes above and the photo-absorption properties of detectors have been investigated under 650-nm laser illumination with different illumination powers. From a comparison of the performances between the two detectors, it was found that a photodetector fabricated with quasi-free-standing graphene shows enhanced performance under a light power of 0.018 mW. Responsivity and external quantum efficiency reach maxima of 5.11 A/W and 9.74%, respectively. This dramatic improvement is mainly due to the disappearance of the buffer layer in epitaxial graphene, providing a new method to achieve optimization of graphene-based opto-electrical devices.
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spelling pubmed-68042062019-11-18 Enhanced Performance of a Visible Light Detector Made with Quasi-Free-Standing Graphene on SiC Li, Xiaomeng Chen, Xiufang Xu, Xiangang Hu, Xiaobo Zuo, Zhiyuan Materials (Basel) Article The excellent optoelectronic properties of graphene give it great potential for applications in optical detection. Among the graphenes obtained through many synthetic methods, epitaxial graphene obtained by thermal decomposition on silicon carbide has remarkable advantages for preparing photodetectors. In this research, epitaxial graphene has been successfully prepared on a silicon surface (0001) of semi-insulating 4H-SiC substrate with a size of 10 mm × 10 mm and epitaxial graphene has been converted to quasi-free-standing graphene by hydrogen passivation. Two metal-graphene-metal photodetectors were fabricated using the two types of graphenes above and the photo-absorption properties of detectors have been investigated under 650-nm laser illumination with different illumination powers. From a comparison of the performances between the two detectors, it was found that a photodetector fabricated with quasi-free-standing graphene shows enhanced performance under a light power of 0.018 mW. Responsivity and external quantum efficiency reach maxima of 5.11 A/W and 9.74%, respectively. This dramatic improvement is mainly due to the disappearance of the buffer layer in epitaxial graphene, providing a new method to achieve optimization of graphene-based opto-electrical devices. MDPI 2019-10-02 /pmc/articles/PMC6804206/ /pubmed/31581618 http://dx.doi.org/10.3390/ma12193227 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Xiaomeng
Chen, Xiufang
Xu, Xiangang
Hu, Xiaobo
Zuo, Zhiyuan
Enhanced Performance of a Visible Light Detector Made with Quasi-Free-Standing Graphene on SiC
title Enhanced Performance of a Visible Light Detector Made with Quasi-Free-Standing Graphene on SiC
title_full Enhanced Performance of a Visible Light Detector Made with Quasi-Free-Standing Graphene on SiC
title_fullStr Enhanced Performance of a Visible Light Detector Made with Quasi-Free-Standing Graphene on SiC
title_full_unstemmed Enhanced Performance of a Visible Light Detector Made with Quasi-Free-Standing Graphene on SiC
title_short Enhanced Performance of a Visible Light Detector Made with Quasi-Free-Standing Graphene on SiC
title_sort enhanced performance of a visible light detector made with quasi-free-standing graphene on sic
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6804206/
https://www.ncbi.nlm.nih.gov/pubmed/31581618
http://dx.doi.org/10.3390/ma12193227
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