Journal ArticleDOI
Origin of Yellow-Band Emission in Epitaxially Grown GaN Nanowire Arrays
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TLDR
The idea using buffering/barrier layers to isolate the dislocation threading in epitaxially grown GaN nanowires can be extended to the rational synthesis and structural defect controlling of a wide range of semiconductor films and nanostructures with superior crystal quality and excellent luminescence property.Abstract:
Here, we report the origin of the yellow-band emission in epitaxial GaN nanowire arrays grown under carbon-free conditions. GaN nanowires directly grown on [0001]-oriented sapphire substrate exhibit an obvious and broad yellow-band in the visible range 400–800 nm, whereas the insertion of Al/Au layers in GaN–sapphire interface significantly depresses the visible emission, and only a sharp peak in the UV range (369 nm) can be observed. The persuasive differences in cathodoluminescence provide direct evidence for demonstrating that the origin of the yellow-band emission in GaN nanowire arrays arises from dislocation threading. The idea using buffering/barrier layers to isolate the dislocation threading in epitaxially grown GaN nanowires can be extended to the rational synthesis and structural defect controlling of a wide range of semiconductor films and nanostructures with superior crystal quality and excellent luminescence property.read more
Citations
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Journal ArticleDOI
Giant UV photoresponse of a GaN nanowire photodetector through effective Pt nanoparticle coupling
TL;DR: In this article, the peak responsivity and external quantum efficiency of the GaN nanowire UV photodetector were increased from 773 to 6.39 × 104 A W−1 and from 2.71 × 105% to 2.24 × 107%, respectively.
Journal ArticleDOI
Ultrasensitive and Highly Selective Photodetections of UV-A Rays Based on Individual Bicrystalline GaN Nanowire
TL;DR: This work paves a solid way toward the integration of high-performance optoelectronic nanodevices based on bicrystalline or horizontally aligned one-dimensional semiconductor nanostructures.
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Core–shell Co3O4/ZnCo2O4 coconut-like hollow spheres with extremely high performance as anode materials for lithium-ion batteries
TL;DR: In this article, a facile two-step method was used to synthesize a core-shell Co3O4/ZnCo2O4 coconut-like hollow spheres for high-performance lithium-ion batteries.
Journal ArticleDOI
Template Approach to Crystalline GaN Nanosheets.
TL;DR: The template synthetic strategy proposed in this work will open up more opportunities for the achievement of a variety of sheet like nanostructures that can not be obtained through conventional routines and will undoubtedly further promote the fundamental research of newly emerging sheetlike nanostructureures and nanotechnology.
Journal ArticleDOI
Recent progress in group III-nitride nanostructures: From materials to applications
TL;DR: In this paper, a comprehensive review on the rational synthesis, fundamental properties and promising applications of group-III nitride nanostructures is provided, as well as the detailed factors that influence the optical and electrical properties of the nanostructure.
References
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Journal ArticleDOI
Luminescence properties of defects in GaN
TL;DR: In this paper, the structural and point defects caused by lattice and stacking mismatch with substrates are discussed. But even the best of the three binaries, InN, AIN and AIN as well as their ternary compounds, contain many structural defects, and these defects notably affect the electrical and optical properties of the host material.
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The Roles of Structural Imperfections in InGaN-Based Blue Light-Emitting Diodes and Laser Diodes
TL;DR: In this paper, high efficiency light-emitting diodes emitting amber, green, blue, and ultraviolet light have been obtained through the use of an InGaN active layer instead of a GaN active layers.
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Gallium vacancies and the yellow luminescence in GaN
TL;DR: In this article, the authors investigated native defects and native defect impurity complexes as candidate sources for the yellow luminescence in GaN and found strong evidence that the Ga vacancy (VGa) is responsible.
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Gallium Nitride Nanowire Nanodevices
TL;DR: In this article, gate-dependent electrical transport measurements show that the GaN NWs are n-type and that the conductance of NW−FETs can be modulated by more than 3 orders of magnitude.
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Multi-quantum-well nanowire heterostructures for wavelength-controlled lasers.
Fang Qian,Yat Li,Yat Li,Silvija Gradečak,Silvija Gradečak,Hong Gyu Park,Hong Gyu Park,Yajie Dong,Yong Ding,Zhong Lin Wang,Charles M. Lieber +10 more
TL;DR: This work reports the first multi-quantum-well (MQW) core/shell nanowire heterostructures based on well-defined III-nitride materials that enable lasing over a broad range of wavelengths at room temperature and demonstrates a new level of complexity in nanowires, which potentially can yield free-standing injection nanolasers.