Broadband surface plasmon resonance enhanced self-powered graphene/GaAs photodetector with ultrahigh detectivity

316

206

Ultraviolet photodetectors (UV PDs) with "5S" (high sensitivity, high signal-tonoise ratio, excellent spectrum selectivity, fast speed, and great stability) have been proposed as promising optoelectronics in recent years. To realize highperformance UV PDs, heterojunctions are created to form a built-in electrical field for suppressing recombination of photogenerated carriers and promoting collection efficiency. In this progress report, the fundamental components of heterojunctions including UV response semiconductors and other materials functionalized with unique effects are discussed. Then, strategies of building PDs with lattice-matched heterojunctions, van der Waals heterostructures, and other heterojunctions are summarized. Finally, several applications based on heterojunction/heterostructure UV PDs are discussed, compromising flexible photodetectors, logic gates, and image sensors. This work draws an outline of diverse materials as well as basic assembly methods applied in heterojunction/heterostructure UV PDs, which will help to bring about new possibilities and call for more efforts to unleash the potential of heterojunctions.

Section: Heterojunction Integration For Uv Pdsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent Progress of Heterojunction Ultraviolet Photodetectors: Materials, Integrations, and Applications

Chen

Ouyang

Yang

et al. 2020

316

206

Section: Mechanism Of Plasmonic‐assisted Devicesmentioning

confidence: 99%

“…Lu et al fabricated the broadband photodetector based on the heterostructure of graphene/GaAs with spinning a layer of Ag NPs as shown in Figure b. Due to the SPR‐enhanced light–matter interactions, they achieved the responsivity of 210 mA W −1 (enhanced by 38%) and detectivity of 2.98 × 10 13 Jones (enhanced by ≈202%) at the spectral range of 405 nm.…”

Section: Mechanism Of Plasmonic‐assisted Devicesmentioning

confidence: 99%

Surface Plasmonic‐Assisted Photocatalysis and Optoelectronic Devices with Noble Metal Nanocrystals: Design, Synthesis, and Applications

Zada

Muhammad

Ahmad

et al. 2019

218

134

The surface plasmon resonance (SPR) of noble metals is known to improve the efficiency of various processes and devices. The photocatalytic process is the production of fuels and storage of solar photons in chemical bonds without imposing harmful threats to the environment. Photovoltaics are other devices utilizing solar energy for electrical energy. Similarly, other optoelectronic devices like photodetectors absorb photons and convert it into charges via electron–hole dissociation processes. In contrast, light‐emitting optoelectronic devices work based on the phenomenon of charge recombination to produce light. All these devices, however, have efficiency limitations, which impede the application of novel functional materials in these devices. A more direct approach is the utilization of noble metals and their complexes, which significantly enhance the efficiencies of these devices by SPR. This article highlights recent works and applications of noble metals by SPR‐enhanced photocatalysis for hydrogen evolution from water, CO2 conversion into useful compounds, and oxidation of hazardous pollutants. In addition, the plasmon‐enhancement of optoelectronic devices is summarized. Several possible mechanisms that have been previously reported in the literature are discussed in this work, with particular emphasis on different features of these mechanisms involving devices that are not highlighted and therefore need more attention.

“…Recently, 2D materials such as graphene, topological insulators, transition metal dichalcogenides, and black phosphorous have revealed their incredible improvements in the field of optoelectronics and photonics applications such as ultrafast lasers, broadband photodetectors, high‐performance light‐emitting diodes (LEDs), ultrafast optical modulators, broadband polarizers, and high quantum efficiency plasmonic devices . Due to their good flexibility, 2D materials could also be easily integrated with optical fibers to realize all‐optical operation, which offers attractive advantages in structural miniaturization, resistance to electromagnetic interference, highly multiplexing ability, noncontact, long‐term stability, and remote use.…”

Section: Introductionmentioning

confidence: 99%

Graphene Heterostructure Integrated Optical Fiber Bragg Grating for Light Motion Tracking and Ultrabroadband Photodetection from 400 nm to 10.768 µm

Shivananju

Bao

Yu³

et al. 2019

Integrated photonics and optoelectronics devices based on graphene and related 2D materials are at the core of the future industrial revolution, facilitating compact and flexible nanophotonic devices. Tracking and detecting the motion of broadband light in millimeter to nanometer scale is an unfold science which has not been fully explored. In this work, tracking and detecting the motion of light (millimeter precision) is first demonstrated by integrating graphene with an optical fiber Bragg grating device (graphene-FBG). When the incident light moves toward and away from the graphene-FBG device, the Bragg wavelength red-shifts and blue-shifts, indicating its light motion tracking ability. Such light tracking capability can be further extended to an ultrabroad wavelength range as all-optical photodetectors show the robust response from 400 nm to 10.768 µm with a linear optical response. Interestingly, it is found that graphene-Bi 2 Te 3 heterostructure on FBG shows 87% higher photoresponse than graphene-FBG at both visible and telecom wavelengths, due to stronger phonon-electron coupling and photo-thermal conversion in the heterostructure. The device also shows superior stability even after 100 d. This work may open up amazing integrated nanophotonics applications such as astrophysics, optical communication, optical computing, optical logic gating, spectroscopy, and laser biology.