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The Research and Application of Graphene Phototransducer

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Sensor Materials".

Deadline for manuscript submissions: closed (31 July 2021) | Viewed by 7165

Special Issue Editors


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Guest Editor
Department of Mechanical Engineering, George Mason University, 4439 Nguyen Engineering Building, 4400 University Dr, MS 6E9, Fairfax, VA 22030, USA
Interests: micro/nano mechanics; micro/nano photonics; micro/nano manufacturing; 2D materials; nanomaterials; laser-induced graphene; structured 2D materials; nano bio sensors; opto-electronics; flexible electronics & plasmonics; opto-fluidics; microfluidics
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Guest Editor
Arizona State University, Tempe, United States
Interests: Two-dimensional materials; Materials theory; Materials modeling; Quantum materials; Defects in semiconductors; Light-matter interactions

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Guest Editor
Department of Physics, Chungbuk National University, Republic of Korea
Interests: Nanoplasmonics; nanolasers; nanowires; infrared photonics; graphene plasmonics

Special Issue Information

Dear Colleagues,

Phototransducers convert light into electrical signals, and are widely used for various applications including biomedical imaging, optical communications, military (e.g., night vision and security), remote and environmental sensing, etc. Two-dimensional materials such as graphene and transition metal dichalcogenide monolayers (TMDs) have emerged as optical functional materials, which are used as photosensitive materials to develop photodetectors. Especially, graphene has been a center of research due to its extraordinary material properties including broadband light absorption, high mobility, electrostatic tunability, transparency, as well as mechanical strength and flexibility. 2D materials including graphene and various TMDs (e.g., MoS2) allow for wafer-scale production, low cost, and large-scale integration. 2D materials and their hybrid systems (e.g., heterostructures of bilayered 2D materials) offer broadband and ultrafast response from ultraviolet, visible, infrared, and terahertz frequency ranges. Moreover, phototransducers based on 2D hybrid systems combined with other material platforms such as plasmonic nanoparticles and structures, perovskites, quantum dots, and other nanomaterials enable ultrasensitive light detection with broadband capability. This Special Issue will focus on the current state-of-the-art research and applications of photodetectors based on graphene and graphene-related materials (e.g., reduced graphene oxides) as well as hybrid systems realized by the combination of different 2D materials or of 2D materials and other materials including plasmonic nanoparticles and structures, perovskites, quantum dots, organic materials, and other nanomaterials.

Dr. Pilgyu Kang
Guest Editor

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Keywords

  • graphene
  • two-dimensional (2D) materials
  • 2D transition metal dichalcogenide monolayers (TMDs)
  • heterostructures
  • phototransducers
  • photodetectors
  • photosensors
  • phototransistors
  • photodiodes
  • plasmonic nanoparticles and structures
  • perovskites
  • quantum dots
  • nanomaterials
  • responsivity
  • broadband
  • ultraviolet
  • visible
  • infrared
  • terahertz

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Published Papers (2 papers)

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Research

11 pages, 14700 KiB  
Communication
The Highly Uniform Photoresponsivity from Visible to Near IR Light in Sb2Te3 Flakes
by Shiu-Ming Huang, Jai-Lung Hung, Mitch Chou, Chi-Yang Chen, Fang-Chen Liu and Ruei-San Chen
Sensors 2021, 21(4), 1535; https://doi.org/10.3390/s21041535 - 23 Feb 2021
Cited by 8 | Viewed by 3177
Abstract
Broadband photosensors have been widely studied in various kinds of materials. Experimental results have revealed strong wavelength-dependent photoresponses in all previous reports. This limits the potential application of broadband photosensors. Therefore, finding a wavelength-insensitive photosensor is imperative in this application. Photocurrent measurements were [...] Read more.
Broadband photosensors have been widely studied in various kinds of materials. Experimental results have revealed strong wavelength-dependent photoresponses in all previous reports. This limits the potential application of broadband photosensors. Therefore, finding a wavelength-insensitive photosensor is imperative in this application. Photocurrent measurements were performed in Sb2Te3 flakes at various wavelengths ranging from visible to near IR light. The measured photocurrent change was insensitive to wavelengths from 300 to 1000 nm. The observed wavelength response deviation was lower than that in all previous reports. Our results show that the corresponding energies of these photocurrent peaks are consistent with the energy difference of the density of state peaks between conduction and valence bands. This suggests that the observed photocurrent originates from these band structure peak transitions under light illumination. Contrary to the most common explanation that observed broadband photocurrent carrier is mainly from the surface state in low-dimensional materials, our experimental result suggests that bulk state band structure is the main source of the observed photocurrent and dominates the broadband photocurrent. Full article
(This article belongs to the Special Issue The Research and Application of Graphene Phototransducer)
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11 pages, 4480 KiB  
Article
Graphene Electro-Optical Switch Modulator by Adjusting Propagation Length Based on Hybrid Plasmonic Waveguide in Infrared Band
by Ming Cai, Shulong Wang, Zhihong Liu, Yindi Wang, Tao Han and Hongxia Liu
Sensors 2020, 20(10), 2864; https://doi.org/10.3390/s20102864 - 18 May 2020
Cited by 8 | Viewed by 3112
Abstract
A modulator is the core of many optoelectronic applications such as communication and sensing. However, a traditional modulator can hardly reach high modulation depth. In order to achieve the higher modulation depth, a graphene electro-optical switch modulator is proposed by adjusting propagation length [...] Read more.
A modulator is the core of many optoelectronic applications such as communication and sensing. However, a traditional modulator can hardly reach high modulation depth. In order to achieve the higher modulation depth, a graphene electro-optical switch modulator is proposed by adjusting propagation length in the near infrared band. The switch modulator is designed based on a hybrid plasmonic waveguide structure, which is comprised of an SiO2 substrate, graphene–Si–graphene heterostructure, Ag nanowire and SiO2 cladding. The propagation length of the hybrid plasmonic waveguide varies from 0.14 μm to 20.43 μm by the voltage tunability of graphene in 1550 nm incident light. A modulator with a length of 3 μm is designed based on the hybrid waveguide and it achieves about 100% modulation depth. The lower energy loss (~1.71 fJ/bit) and larger 3 dB bandwidth (~83.91 GHz) are attractive for its application in a photoelectric integration field. In addition, the excellent robustness (error of modulation effects lower than 8.84%) is practical in the fabrication process. Most importantly, by using the method of adjusting propagation length, other types of graphene modulators can also achieve about 100% modulation depth. Full article
(This article belongs to the Special Issue The Research and Application of Graphene Phototransducer)
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