An Ultrahigh Responsivity (9.7 mA W−1) Self‐Powered Solar‐Blind Photodetector Based on Individual ZnO–Ga2O3 Heterostructures

Zhao, Bin; Wang, Fei; Chen, Hongyu; Zheng, Lingxia; Su, Longxing; Zhao, Dongxu; Fang, Xiaosheng

doi:10.1002/adfm.201700264

Cited by 698 publications

(292 citation statements)

References 51 publications

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“…Besides, BN based PDs begin to attract substantial attentions for solar-blind detection [102][103][104] due to a wide bandgap of 5.2 eV (hexagonal BN) or 6.4 eV (cubic BN). 116) In addition, groups of novel materials including ZnO, 105,106) Ga 2 O 3 , 107-109) MgZnO, [110][111][112] and two-dimensional (2D) perovskite 113) and nanostructures in the form of superlattice (SL), 103) nanowires (NWs), core-shell structures 109) have emerged thanks to the advances in material growth and fabrication techniques. The transient response, or stability of these novel solar-blind PDs still requires further investigation, and implementation of these devices in communication are still lacking.…”

Section: Detectorsmentioning

confidence: 99%

“…Table II summarizes the performance of semiconductor based solar-blind PDs. 88,[96][97][98][99][100][101][102][103][104][105][106][107][108][109][110][111][112][113] The table is ordered by the use of different groups of materials. As indicated in the table, III-nitride based PDs are among the first and ideal choices for high efficiency and high-speed devices.…”

Section: Detectorsmentioning

confidence: 99%

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Light based underwater wireless communications

Oubei

Shen

Kammoun

et al. 2018

Jpn. J. Appl. Phys.

120

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Underwater wireless optical communication (UWOC) is a wireless communication technology that uses visible light to transmit data in underwater environment. Compared to radio-frequency (RF) and acoustic underwater techniques, UWOC has many advantages including large information bandwidth, unlicensed spectrum and low power requirements. This review paper provides an overview of the latest UWOC research. Additionally, we present a detailed description of transmitter and receiver technologies which are key components of UWOC systems. Moreover, studies investigating underwater optical channel models for both simple attenuation and the impact of turbulence including air bubbles and inhomogeneous salinity and temperature are also described. Future research challenges are identified and outlined.

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Section: Detectorsmentioning

confidence: 99%

Section: Detectorsmentioning

confidence: 99%

Light based underwater wireless communications

Oubei

Shen

Kammoun

et al. 2018

Jpn. J. Appl. Phys.

120

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] Here, a sol-gel method has been developed and used for the fabrication of (relatively) thick porous polycrystalline ZnO layers. A similar method has already been reported for thin films by, e.g., Gohdsi et al 34 and Choudhury et al 44 Here the method has been extended for obtaining well-defined thick ZnO films (up to ∼2 μm) by using a sequential drop-cast approach in a 'vacuum' environment.…”

Section: 2mentioning

confidence: 99%

“…1,2 ZnO has been studied extensively as a candidate for a number of applications, e.g., transparent conductive electrodes, optical waveguides, piezo-electric transducers, acoustic wave devices, conductive gas sensors, solar cell windows and biosensing. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] This makes it attractive for the fields of optoelectronics, 2,15,16 sensors, 1,5 piezoelectrics 7,17 and biomedical applications. 8 In addition, nanostructured ZnO coatings can provide new ways for light manipulation (e.g.…”

mentioning

confidence: 99%

Investigations of Sol-Gel ZnO Films Nanostructured by Reactive Ion Beam Etching for Broadband Anti-Reflection

Visser

Prajapati

et al. 2017

ECS J. Solid State Sci. Technol.

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A novel ZnO dry etching approach is introduced using reactive ion beam etching of thick sol-gel ZnO layers for controlled nanodisk/nanocone array fabrication. In this approach the same system can be used for the colloidal lithography mask (silica particles) size reduction by a fluorine-based chemistry and etching of the ZnO nanostructures by a CH 4 /H 2 /Ar chemistry. This resulted in a ZnO:SiO 2 etch selectivity of ∼3.4 and etch rate of ∼56 nm/min. Thick sol-gel ZnO layers, nanodisk arrays and (truncated) nanocone arrays were fabricated and their optical properties analyzed by finite-difference time-domain simulations and spectrally-resolved total/specular reflectivity measurements. The demonstrated broadband omnidirectional anti-reflection, controlled nanostructure period/geometry and low absorption in the visible-NIR spectrum makes these sol-gel ZnO nanostructures very interesting for many optoelectronic applications, including photovoltaics. ZnO is a wide bandgap (∼3.37 eV at room temperature) II-VI semiconductor. Predominantly it crystalizes in the Wurtzite crystal structure and bulk ZnO has a refractive index of n ≈ 1.9-2.2 in the NIR-visible wavelength range. Some of the features of ZnO interesting for photovoltaic applications are its high transparency in the visible-NIR spectrum, a wide bandgap, a large exciton binding energy (60 meV at room temperature), non-centrosymmetric structure, strong room temperature luminescence and biocompatibility. 1,2ZnO has been studied extensively as a candidate for a number of applications, e.g., transparent conductive electrodes, optical waveguides, piezo-electric transducers, acoustic wave devices, conductive gas sensors, solar cell windows and biosensing. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Here, a sol-gel method has been developed and used for the fabrication of (relatively) thick porous polycrystalline ZnO layers. A similar method has already been reported for thin films by, e.g., Gohdsi et al. 34 and Choudhury et al. 44 Here the method has been extended for obtaining well-defined thick ZnO films (up to ∼2 μm) by using a sequential drop-cast approach in a 'vacuum' environment. The 'building' of these sequential ZnO layers to one thick layer provides a method to tune specific layer thicknesses on the micro/nanoscale. Other approaches for obtaining thick porous ZnO layers have been reported. [45][46][47] The sol-gel method is attractive since it is simple, cheap and straight forward. In addition, this method offers the flexibility to provide ZnO layers on a variety of surfaces. Sol-gel layers, consisting of crystals with c-axis orientation vertical to the surface, can be * Electrochemical Society Member.z E-mail: dvisser@kth.se obtained when the substrate material has a similar Wurtzite crystal structure to ZnO, e.g., GaN, SiC and (0001)-sapphire. For other types of substrates dense sol-gel layers, composed of non-specific direction, can still be obtained. In this work, thick ZnO layers have been fabricated and nanostructured on a Si substrate. These laye...

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“…The response time (t r ) and decay time (t d ) are defined as the duration for photocurrent to rise from 10% to 90% of the peak value and to decrease from 90% to 10% of the peak value, respectively. 29 An enlarged view of the rise and decay processes of the photovoltage under 532 nm modulated laser (10 Hz) is shown in Fig. 4(c).…”

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confidence: 99%