Substantial influence on solar energy harnessing ability by geometries of ordered Si nanowire array

Wu, Zilong; Wang, Ziyi; Wang, Song-You; Zhong, Zhenyang

doi:10.1186/1556-276x-9-495

Cited by 8 publications

(4 citation statements)

References 27 publications

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“…Normally, a nanopatterned surface can be regarded as an antireflection layer, depending on the surface morphologies and wavelength of incident light. In our case, the large-area ordered GeSi MQW-NPAs can effectively reduce the reflection of incident light, according to the previous results [ 17 – 19 ], which could increase the absorption of incident light and result in PL enhancement. In order to verify the effect on the light trapping, both reflectance spectrum measurements and FDTD simulations were carried out, as shown in Fig.…”

Section: Resultssupporting

confidence: 83%

Fabrication and Photoluminescence Study of Large-Area Ordered and Size-Controlled GeSi Multi-quantum-well Nanopillar Arrays

Jiang¹,

Huang²,

Zhu³

et al. 2016

Nanoscale Res Lett

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Large-area ordered GeSi multi-quantum-well nanopillar array (MQW-NPA) samples with different nanopillar lateral sizes (270, 120, and 70 nm) are fabricated by a cost-effective and scalable dry-etching process in combination with nanosphere lithography technique. A significant enhancement in photoluminescence (PL) intensity has been observed in the GeSi MQW-NPA samples compared with the as-grown GeSi MQW one. Nanopillar samples with different lateral sizes show different enhancements in PL intensity. The enhancements are analyzed quantitatively and attributed to three factors. One is the antireflection of the nanopillar structures. Another is an enhanced extraction in nanopillar arrays at the emission wavelength. Thirdly, the GeSi quantum wells in close proximity to the substrates would have more contribution to the PL than before etching. Our results show that all the three factors should be taken into account in designing and fabricating surface microstructures of GeSi MQW materials in order to improve their optical properties.

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Section: Resultssupporting

confidence: 83%

Fabrication and Photoluminescence Study of Large-Area Ordered and Size-Controlled GeSi Multi-quantum-well Nanopillar Arrays

Jiang¹,

Huang²,

Zhu³

et al. 2016

Nanoscale Res Lett

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“…It was obtained that the average reflection of the SiO 2 negative replica was just 1/4 of the reflection of the flat plate without the negative quasi-honeycomb-like structure. To further clarify the influence of the negative quasihoneycomb-like structure on the super light trapping property of the SiO 2 negative replica, the SEL caused by the reflection of the SiO 2 negative replica and the flat plate was calculated according to the equation below, where I (λ) is the solar energy intensity as a function of the wavelength λ at AM1.5 and α (λ) is the measured reflectance of the SiO 2 negative replica, and the flat plate is a function of the wavelength λ [37][38][39][40].…”

Section: Analysis Of the Light Trapping Mechanism Of The Sio 2 Negatimentioning

confidence: 99%

An Ingenious Super Light Trapping Surface Templated from Butterfly Wing Scales

Han¹,

Li²,

Mu³

et al. 2016

Nano Online

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Based on the super light trapping property of butterfly Trogonoptera brookiana wings, the SiO 2 replica of this bionic functional surface was successfully synthesized using a simple and highly effective synthesis method combining a sol-gel process and subsequent selective etching. Firstly, the reflectivity of butterfly wing scales was carefully examined. It was found that the whole reflectance spectroscopy of the butterfly wings showed a lower level (less than 10 %) in the visible spectrum. Thus, it was confirmed that the butterfly wings possessed a super light trapping effect. Afterwards, the morphologies and detailed architectures of the butterfly wing scales were carefully investigated using the ultra-depth three-dimensional (3D) microscope and field emission scanning electronic microscopy (FESEM). It was composed by the parallel ridges and quasi-honeycomb-like structure between them. Based on the biological properties and function above, an exact SiO 2 negative replica was fabricated through a synthesis method combining a sol-gel process and subsequent selective etching. At last, the comparative analysis of morphology feature size and the reflectance spectroscopy between the SiO 2 negative replica and the flat plate was conducted. It could be concluded that the SiO 2 negative replica inherited not only the original super light trapping architectures, but also the super light trapping characteristics of bio-template. This work may open up an avenue for the design and fabrication of super light trapping materials and encourage people to look for more super light trapping architectures in nature.

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“…Monolayers or multiple layers of self‐assembled colloidal spheres have also been used as masks in nanosphere lithography (NSL) . NSL has enabled the fabrication of structures such as silicon nanopillar arrays, photonic crystals, and plasmonic metasurfaces . However, most of the patterns created by NSL are periodic .…”

Section: Fabrication Of Moiré Metasurfaces and Metamaterialsmentioning

confidence: 99%

“…Due to the reduced differences in length scale between electromagnetic waves and these building blocks, metamaterials and metasurfaces enhance light–matter interactions by orders. Advancements in modeling, nanofabrication, and characterization tools have spawned metamaterials and metasurfaces with unprecedented light‐manipulation capabilities, including subwavelength focusing, negative refraction, and superabsorption …”

Section: Introductionmentioning

confidence: 99%

Moiré Metamaterials and Metasurfaces

Zheng

2018

Advanced Optical Materials

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IntroductionOur ever-increasing knowledge of light-matter interactions has enabled the development of optical components and devices for light control. These range from macroscale mirrors for the Hubble Space Telescope to nanoscale optical cavities for onchip light sources. Devices made from conventional materials, however, enable limited light manipulation. For example, the most-skilled craftsmen of conventional lenses cannot exceed the diffraction limit of light to realize subwavelength focusing.Optical metamaterials and metasurfaces of microscale or nanoscale building blocks, also known as "meta-atoms," have emerged to overcome the limits of natural materials. Due to the reduced differences in length scale between electromagnetic waves and these building blocks, metamaterials and metasurfaces enhance light-matter interactions by orders. Advancements in modeling, nanofabrication, and characterization tools [1][2][3][4][5][6][7][8] have spawned metamaterials and metasurfaces with unprecedented light-manipulation capabilities, including subwavelength focusing, negative refraction, and superabsorption. [9][10][11][12][13][14][15] Optical metamaterials and metasurfaces often rely on the strong interactions between light and meta-atoms to manipulate light-propagation properties (e.g., phase, polarization, and amplitude). With the ability of surface plasmons to concentrate light at the nanoscale, plasmonic nanostructures enhance Optical metamaterials and metasurfaces enable versatile light manipulations. Advancements in modeling, nanofabrication, and characterization tools have led to the development of metamaterials and metasurfaces for many applications: energy conversion, biomedicine, and information technology. Recently, metamaterials and metasurfaces with moiré configurations have attracted strong interest due to their highly tunable optical responses and high-throughput fabrication. Herein, state-of-the-art moiré metamaterials and metasurfaces are reviewed. The presentation covers fabrication techniques, structure-property relationships, and applications in lasing and biomedical sensing. The review concludes with challenges and opportunities for moiré metamaterials and metasurfaces. www.advopticalmat.de metasurfaces which feature microscale and nanoscale metaatoms. Next, we discuss their properties and applications. We conclude with perspectives on challenges and opportunities.

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Substantial influence on solar energy harnessing ability by geometries of ordered Si nanowire array

Cited by 8 publications

References 27 publications

Fabrication and Photoluminescence Study of Large-Area Ordered and Size-Controlled GeSi Multi-quantum-well Nanopillar Arrays

Fabrication and Photoluminescence Study of Large-Area Ordered and Size-Controlled GeSi Multi-quantum-well Nanopillar Arrays

An Ingenious Super Light Trapping Surface Templated from Butterfly Wing Scales

Moiré Metamaterials and Metasurfaces

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