Self‐Assembled Metastable γ‐Ga<sub>2</sub>O<sub>3</sub> Nanoflowers with Hexagonal Nanopetals for Solar‐Blind Photodetection

Teng, Yue; Song, Le Xin; Ponchel, A.; Yang, Zailin; Xia, Juan

doi:10.1002/adma.201402047

Cited by 78 publications

(50 citation statements)

References 55 publications

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“…DUV solar‐blind PDs are usually constructed on wide band gap semiconductor materials, including diamond, AlGaN, MgZnO, and Ga 2 O 3 . Among them, Ga 2 O 3 is a desirable candidate because of its cheap cost and suitable wide bandgap (≈4.5–4.9 eV) without the necessity of alloying process, which makes it attract more and more attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

Room‐Temperature Fabricated Amorphous Ga₂O₃ High‐Response‐Speed Solar‐Blind Photodetector on Rigid and Flexible Substrates

Cui

Mei

Zhang

et al. 2017

Advanced Optical Materials

274

203

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A solution to the fabrication of amorphous Ga2O3 solar‐blind photodetectors on rigid and flexible substrates at room temperature is reported. A robust improvement in the response speed is achieved by delicately controlling the oxygen flux in the reactive radio frequency magnetron sputtering process. Temporal response measurements show that the detector on quartz has a fast decay time of 19.1 µs and a responsivity of 0.19 A W−1 as well, which are even better than those single crystal Ga2O3 counterparts prepared at high temperatures. X‐ray photoelectron spectroscopy and current–voltage tests suggest that the reduced oxygen vacancy concentration and the increased Schottky barrier height jointly contribute to the faster response speed. Amorphous Ga2O3 solar‐blind photodetector is further constructed on polyethylene naphthalate substrate. The flexible devices demonstrate similar photoresponse behavior as the rigid ones, and no significant degradation of the device performance is observed in bending states and fatigue tests. The results reveal the importance of finely tuned oxygen processing gas in promoting the device performance and the applicability of room‐temperature synthesized amorphous Ga2O3 in fabrication of flexible solar‐blind photodetectors.

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Section: Introductionmentioning

confidence: 99%

Room‐Temperature Fabricated Amorphous Ga₂O₃ High‐Response‐Speed Solar‐Blind Photodetector on Rigid and Flexible Substrates

Cui

Mei

Zhang

et al. 2017

Advanced Optical Materials

274

203

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“…The h-WO 3 -rich samples all exhibited good recycled visible-light photochromic performance. Song [23] designed self-assembled metastable γ-Ga 2 O 3 nanoflowers with hexagonal nanopetals for solarblind photodetection. Recently, Imai [19] reported an aqueous strategy for the synthesis of h-WO 3 nanosheets around room temperature, and they were converted from in situ formed barium tungstate (BaWO 4 )-PAA [PAA: poly(acrylic acid)].…”

Section: Introductionmentioning

confidence: 99%

Aqueous Synthesis and Visible‐Light Photochromism of Metastable h‐WO₃ Hierarchical Nanostructures

Zhao

Wang

et al. 2015

Eur J Inorg Chem

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A facile aqueous approach to the synthesis of metastable hexagonal tungsten oxide (h-WO 3 ) hierarchical nanostructures at low temperature was investigated. The spherelike h-WO 3 architectures are constructed from 1D nanorods. Polyvinyl pyrrolidone (PVP) in the reaction system facilitates the quick formation of h-WO 3 nuclei of the metastable phase through electrostatic interactions between protonated PVP[a] College

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“…Its rejection ratio (250/280 nm) is as high as 2 × 10 4 , indicating its excellent UV light wavelength selectivity . In addition to β‐Ga 2 O 3 , other phases, such as γ‐Ga 2 O 3 was also used to perform UV solar‐blind detection, and achieved short response time and large signal‐noise ratio …”

Section: Introductionmentioning

confidence: 99%

Rectifying Effect of the Sr₃Al₂O₆/Ga₂O₃ Heterojunction

Liu

Wang

Zhi

et al. 2019

Physica Status Solidi (a)

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Oxide semiconductors, including binary and ternary oxides, are promising to be utilized as active layers in electronics. The heterojunctions based on oxides exhibit many attractive physical and structural properties and are preferably used to fabricate devices. Herein, Sr 3 Al 2 O 6 /Ga 2 O 3 heterojunction is fabricated using radiofrequency magnetron sputtering on silicon substrate, which shows an enhanced current-voltage characteristic under the 254 nm ultraviolet light illumination due to the photogenerated carriers in Ga 2 O 3 . In addition, the heterojunction provides evident rectified properties in the dark, and the improved rectified properties can be obtained under the 254 nm UV light illumination due to the electron-hole pairs separation in the depletion region due to the built-in electric field, while the rectified ratio decrease from %700 at AE0.5 to %20 V at AE5 V, which is due to the electron tunneling caused by shrinking depletion layer. Moreover, the band offsets of the heterojunction is determined by the X-ray photoelectron spectroscopy, which suggests a type I alignment with conduction band offset of 0.94 AE 0.02 eV and valence band offset of 0.53 AE 0.02 eV. The interfacial energy band offsets verify the potential implication for their rectifying property.

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Self‐Assembled Metastable γ‐Ga₂O₃ Nanoflowers with Hexagonal Nanopetals for Solar‐Blind Photodetection

Cited by 78 publications

References 55 publications

Room‐Temperature Fabricated Amorphous Ga₂O₃ High‐Response‐Speed Solar‐Blind Photodetector on Rigid and Flexible Substrates

Room‐Temperature Fabricated Amorphous Ga₂O₃ High‐Response‐Speed Solar‐Blind Photodetector on Rigid and Flexible Substrates

Aqueous Synthesis and Visible‐Light Photochromism of Metastable h‐WO₃ Hierarchical Nanostructures

Rectifying Effect of the Sr₃Al₂O₆/Ga₂O₃ Heterojunction

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Self‐Assembled Metastable γ‐Ga2O3 Nanoflowers with Hexagonal Nanopetals for Solar‐Blind Photodetection

Cited by 78 publications

References 55 publications

Room‐Temperature Fabricated Amorphous Ga2O3 High‐Response‐Speed Solar‐Blind Photodetector on Rigid and Flexible Substrates

Room‐Temperature Fabricated Amorphous Ga2O3 High‐Response‐Speed Solar‐Blind Photodetector on Rigid and Flexible Substrates

Aqueous Synthesis and Visible‐Light Photochromism of Metastable h‐WO3 Hierarchical Nanostructures

Rectifying Effect of the Sr3Al2O6/Ga2O3 Heterojunction

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Self‐Assembled Metastable γ‐Ga₂O₃ Nanoflowers with Hexagonal Nanopetals for Solar‐Blind Photodetection

Room‐Temperature Fabricated Amorphous Ga₂O₃ High‐Response‐Speed Solar‐Blind Photodetector on Rigid and Flexible Substrates

Room‐Temperature Fabricated Amorphous Ga₂O₃ High‐Response‐Speed Solar‐Blind Photodetector on Rigid and Flexible Substrates

Aqueous Synthesis and Visible‐Light Photochromism of Metastable h‐WO₃ Hierarchical Nanostructures

Rectifying Effect of the Sr₃Al₂O₆/Ga₂O₃ Heterojunction