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Ultra-broadband metamaterial absorber using slotted metal loops with multi-layers and its anti-reflection analysis

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The Journal of China Universities of Posts and Telecommunications 2015年第5期22卷 41-44页

作者： Yu Ze Lu Guizhen Guo Qingxin School of Telecommunication Engineering Communication University of China

An ultra-thin and broadband absorber which consists of periodic rings with gaps is proposed in this paper. The periodic rings are printed on the middle metallic layers in a four-layer substrate of total thickness is only 3.4 mm. Simulation results, which are gotten by using finite element method(FEM) and finite-difference time-domain(FDTD), show that the absorption is higher than 90% cover the frequencies range from 7.8 GHz to 22.2 GHz. The measurement results of the absorption agree with simulated ones very well. We also discuss the working mechanism according to the anti-reflection theory in the paper.

关键词： metamaterial broadband anti-reflection periodicstr

Microstructure Analysis and Properties of anti-reflection Thin Films for Spherical Silicon Solar Cells

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Energy and Power Engineering 2013年第2期5卷 18-22页

作者： Masato Kanayama Takeo Oku Tsuyoshi Akiyama Youichi Kanamori Satoshi Seo Jun Takami Yoshimasa Ohnishi Yoshikazu Ohtani Mikio Murozono Clean Venture 21 Co. Ltd. Kyoto Japan Department of Materials Science The University of Shiga Prefecture Shiga Japan

Structure and properties of anti-reflection thin films of spherical silicon solar cells were investigated and discussed. Conversion efficiencies of spherical Si solar cells coated with F-doped SnO2 anti-reflection films were improved by annealing. Optical absorption and fluorescence of the solar cells increased after annealing. Lattice constants of F-doped SnO2 anti-reflection layers, which were investigated by X-ray diffraction, decreased after annealing. A mechanism of atomic diffusion of F in SnO2 was discussed. The present work indicated a guideline for spherical silicon solar cells with higher efficiencies.

关键词： Solar Cells Spherical Silicon anti-reflection Film FTO SnO2

Absorption enhancement in thin film a-Si solar cells with double-sided SiO_2 particle layers

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Chinese Physics B 2015年第10期24卷 186-190页

作者：陈乐王庆康沈向前陈文黄堃刘代明 Key Laboratory for Thin Film and Micro-fabrication of the Ministry of Education Department of Microelectronics and NanoscienceShanghai Jiao Tong University School of Physical Science and Technology Engineering Guangxi Colleges and Universities Key Laboratory of Complex System Optimization and Big Data ProcessingYulin Normal University

Light absorption enhancement is very important for improving the power conversion efficiency of a thin film a-Si solar cell. In this paper, a thin-film a-Si solar cell model with double-sided SiO2 particle layers is designed, and then the underlying mechanism of absorption enhancement is investigated by finite difference time domain（FDTD） simulation;finally the feasible experimental scheme for preparing the SiO2 particle layer is discussed. It is found that the top and bottom SiO2 particle layers play an important role in anti-reflection and light trapping, respectively. The light absorption of the cell with double-sided SiO2 layers greatly increases in a wavelength range of 300 nm-800 nm, and the ultimate efficiency increases more than 22% compared with that of the flat device. The cell model with double-sided SiO2 particle layers reported here can be used in varieties of thin film solar cells to further improve their performances.

关键词： thin film a-Si solar cells light trapping anti-reflection Si02 particle

High-contrast top-emitting organic light-emitting devices

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Chinese Physics B 2012年第10期21卷 527-532页

作者：陈淑芬陈春燕杨洋谢军黄维石弘颖程凡 Key Laboratory for Organic Electronics and Information Displays of Jiangsu Province Institute of Advanced MaterialsNanjing University of Posts and Telecommunications

In this paper we report on a high-contrast top-emitting organic light-emitting device utilizing a moderate-reflection contrast-enhancement stack and a high refractive index anti-reflection *** contrast-enhancement stack consists of a thin metal anode layer,a dielectric bilayer,and a thick metal *** resulting device,with the optimized contrast-enhancement stack thicknesses of Ni（30 nm）/MgF 2（62 nm）/ZnS（16 nm）/Ni（20 nm） and the 25-nm-thick ZnS anti-reflection layer,achieves a luminous reflectance of 4.01% in the visible region and a maximum current efficiency of 0.99 cd/A（at 62.3 mA/cm 2） together with a very stable *** contrast ratio reaches 561：1 at an on-state brightness of 1000 cd/m^2 under an ambient illumination of 140 *** addition,the anti-reflection layer can also enhance the transmissivity of the cathode and improve light out-coupling by the effective restraint of microcavity effects.

关键词： top-emitting organic light-emitting device contrast-enhancement stack anti-reflection

Thermo-mechanical dynamics of nanoimprinting anti-reflective structures onto small-core mid-IR chalcogenide fibers [Invited]

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Chinese Optics Letters 2021年第3期19卷 46-52页

作者： Christian R.Petersen Mikkel B.Lotz Christos Markos Getinet Woyessa David Furniss Angela B.Seddon Rafael J.Taboryski O.Bang DTU Fotonik Technical University of DenmarkDK-2800 Kgs.LyngbyDenmark DTU Nanolab Technical University of DenmarkDK-2800 Kgs.LyngbyDenmark NORBLIS DK-2830 VirumDenmark Mid-Infrared Photonics Group University of NottinghamNottingham NG72RDUK NKT Photonics DK-3460 Bi「ke「0dDenmark

Thermal nanoimprinting is a fast and versatile method for transferring the anti-reflective properties of subwavelength nanostructures onto the surface of highly reflective substrates, such as chalcogenide glass optical fiber end faces. In this paper, the technique is explored experimentally on a range of different types of commercial and custom-drawn optical fibers to evaluate the influence of geometric design, core/cladding material, and thermo-mechanical properties. Up to32.4% increased transmission and 88.3% total transmission are demonstrated in the 2–4.3 μm band using a mid-infrared(IR) supercontinuum laser.

关键词： nanoimprint lithography anti-reflection hot imprint chalcogenide glass optical fiber mid-infrared supercontinuum

Monolithic crystalline silicon solar cells with SiN_x layers doped with Tb^(3+) and Yb^(3+) rare-earth ions

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Journal of Rare Earths 2019年第5期37卷 515-519页

作者： Ing-Song Yu Shao-Chun Wu Lucile Dumont Julien Cardin Christophe Labbé Fabrice Gourbilleau Department of Materials Science and Engineering National Dong Hwa University CIMAP CNRS/CEA/ENSICAEN/Université de Caen Normandie

In this study, we propose the fabrication of monolithic crystalline silicon solar cells with Tb^(3+) and Yb^(3+)-doped silicon nitride(SiN_x) layers by low-cost screen-printing methods. The performances of c-Si solar cells can be enhanced by rare-earth ions doped SiN_x layers via the mechanism of spectrum *** SiN_x doped and codoped thin films were deposited by reactive magnetron co-sputtering and integrated as the antireflection coating layers in c-Si solar cells. The characterizations of SiN_x, SiN_x:Tb^(3+) tand SiN_x:Tb^(3+)-Yb^(3+) thin films were conducted by means of photoluminescence, Rutherford backscattering spectroscopy, Ellipsometry spectroscopy and Fourier transform infrared measurements. Their composition and refractive index was optimized to obtain good anti-reflection coating layer for c-Si solar *** electron microscopy performs the uniform coatings on the textured emitter of c-Si solar cells. After the metallization process, we demonstrate monolithic c-Si solar cells with spectrum conversion layers, which lead to a relative increase by 1.34% in the conversion efficiency.

关键词： Crystalline silicon solar cell Spectrum conversion Silicon nitride Down-shifting Rare-earth ion anti-reflection coating

Design and fabrication of broadband ultralow reflectivity black Si surfaces by laser micro/nanoprocessing

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Light(Science & Applications) 2014年第1期3卷 147-154页

作者： Jing Yang Fangfang Luo Tsung Sheng Kao Xiong Li Ghim Wei Ho Jinghua Teng Xiangang Luo Minghui Hong Department of Electrical and Computer Engineering National University of SingaporeSingapore 117576Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and ResearchSingapore 117602Singapore NUS Environmental Research Institute National University of SingaporeSingapore 117411Singapore State Key Laboratory of Optical Technologies for Microfabrication Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China

Light collection efficiency is an important factor that affects the performance of many optical and optoelectronic *** these devices,the high reflectivity of interfaces can hinder efficient light *** minimize unwanted reflection,anti-reflection surfaces can be fabricated by micro/*** this paper,we investigate the fabrication of broadband anti-reflection Si surfaces by laser micro/*** direct writing is applied to create microstructures on Si surfaces that reduce light reflection by light *** addition,laser interference lithography and metal assisted chemical etching are adopted to fabricate the Si nanowire *** anti-reflection performance is greatly improved by the high aspect ratio subwavelength structures,which create gradients of refractive index from the ambient air to the ***,by decoration of the Si nanowires with metallic nanoparticles,surface plasmon resonance can be used to further control the broadband reflections,reducing the reflection to below 1.0%across from 300 to 1200 *** average reflection of 0.8%is achieved.

关键词： anti-reflection broadband laser micro/nanoprocessing surface plasmons

Numerical-Experimental Analysis of the Coal Fracture Formation Mechanism Induced by Liquid CO_(2) Explosion

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Fluid Dynamics & Materials Processing 2023年第12期19卷 3021-3032页

作者： Yun Lei Shenyang Research Institute China Coal Technology&Engineering Group Corp.Fushun113122China State Key Laboratory of Coal Mine Safety Technology Fushun113122China

The highly inefficient simultaneous extraction of coal and gas from low-permeability and high-gas coal seams in deep mines is a major problem often restricting the sustainable development of coal industry.A possible way to solve this problem under deep and complex geological conditions is represented by the technology based on the phase-change induced explosion of liquid carbon *** this work,the mechanism of formation of the coal mass fracture circle resulting from the gas cracking process is theoretically *** simulations show that a blasting crushing zone with a radius of 1.0 m is formed around the blasting *** radius of the sec-ondary expansion zone caused by the exploding gas is 2.0 m,and the extension limit of the explosion fracture is 2.3 *** gas phase change explosion is influenced by the coal roadway driving face,the gas content index and the analytical index of coal *** conducted for comparison also lead to the conclusion that the initial gas emission is increased by 3.7 times from the 100-meter borehole in the original coal mass after coalbed gas explosion anti-reflection.

关键词： Low-permeability gas-rich carbon dioxide anti-reflection gas explosion

Research on ultra-small textured surface of multicrystalline silicon solar cell

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Science China(Technological Sciences) 2013年第4期56卷 952-956页

作者： LI HaoFeng JIA Rui DOU BingFei CHEN Chen XING Zhao YANG YongZhou DING WuChang MENG YanLong LIU XinYu YE TianChun LI ShangQing Institute of Microelectronics Chinese Academy of Sciences Research Center for Advanced Solar Cells Chinese Academy of Sciences Huasheng Ruide Municipal Engineering Co. Ltd

The ultra-small textured surface of multicrystalline silicon solar cell,prepared by electroless chemical-etching method,shows an excellent anti-reflection property over a wide spectral bandwidth.A novel back surface protection method and front surface passivation method have been used in the multicrystalline solar cells with ultra-small textured *** these improvements,the back surface remains intact after the etch process and the efficient minority lifetime is apparently *** test result shows that the solar cell with ultra-small textured surface can obtain better electrical performances by these improvements.

关键词： mc-Si solar cell ultra-small texture anti-reflection surface passivation