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Mid/far-infrared photo-detectors based on graphene asymmetric quantum wells |
| E Ben Salem1,2, R Chaabani2, S Jaziri2,3 |
1. Institut Préparatoire aux Etudes d'Ingénieurs de Tunis, 2, Rue Jawaher Lel Nahrou Monfleury 1089, Tunisie;
2. Laboratoire de Physique de la Matière Condensée, Département de Physique, Faculté des Sciences de Tunis, Campus Universitaire 2092, Tunisie;
3. Département de Physique, Faculté des Sciences de Bizerte, Jarzouna 7021, Bizerte |
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Abstract We conducted a theoretical study on the electronic properties of a single-layer graphene asymmetric quantum well. Quantification of energy levels is limited by electron-hole conversion at the barrier interfaces and free-electron continuum. Electron-hole conversion at the barrier interfaces can be controlled by introducing an asymmetry between barriers and taking into account the effect of the interactions of the graphene sheet with the substrate. The interaction with the substrate induces an effective mass to carriers, allowing observation of Fabry-Pérot resonances under normal incidence and extinction of Klein tunneling. The asymmetry, between barriers creates a transmission gap between confined states and free-electron continuum, allowing the large graphene asymmetric quantum well to be exploited as a photo-detector operating at mid- and far-infrared frequency regimes.
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Received: 19 December 2015
Revised: 18 April 2016
Accepted manuscript online:
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PACS:
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81.05.ue
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(Graphene)
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81.07.St
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(Quantum wells)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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85.60.Gz
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(Photodetectors (including infrared and CCD detectors))
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Corresponding Authors:
E Ben Salem
E-mail: bensalem_emna@yahoo.fr
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Cite this article:
E Ben Salem, R Chaabani, S Jaziri Mid/far-infrared photo-detectors based on graphene asymmetric quantum wells 2016 Chin. Phys. B 25 098101
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