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A new kind of superimposing morphology for enhancing the light scattering in thin film silicon solar cells： Combining random and periodic structure

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Chinese Physics B 2014年第8期23卷 350-356页

作者： Huang Zhen-Hua Institute of Photo-electronics thin Film Devices and Technique of Nankai University Tianjin 300071 China Key laboratory of Photo-electronics thin Film Devices and Technique of Tianjin Tianjin 300071 China Key laboratory of Photo-electronic Information Science and Technology of Ministry of Education (Nankai University) Tianjin 300071 China

In this article, a new type of superimposing morphology comprised of a periodic nanostructure and a random structure is proposed for the first time to enhance the light scattering in silicon-based thin film solar cells. According to the framework of the Reyleigh-Sommerfeld diffraction algorithm and the experimental results of random morphologies, we analyze the light-scattering properties of four superimposing morphologies and compare them with the individual morphologies in detail. The results indicate that the superimposing morphology can offer a better light trapping capacity, owing to the coexistence of the random scattering mechanism and the periodic scattering mechanism. Its scattering property will be dominated by the individual nanostructures whose geometrical features play the leading role.

关键词： light scattering superimposing morphology random periodic

Functions for patch test in finite element analysis of the Mindlin plate and the thin cylindrical shell

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Science china(Physics,Mechanics & Astronomy) 2009年第5期52卷 762-767页

作者： CHEN WanJi 1,2 ,WANG JinZhi 1,3 &ZHAO Jie 1 1State Key laboratory for Structural Analysis of Industrial Equipment,Dalian University of Technology,Dalian 116023,china 2Institute for Structural Analysis of Aerocraft,Shenyang Institute of Aeronautical Engineering,Shenyang 110136,china 3 College of Science,Institute of Dalian Nationalities,Dalian 116022,china State Key laboratory for Structural Analysis of Industrial Equipment Dalian University of Technology Dalian China Institute for Structural Analysis of Aerocraft Shenyang Institute of Aeronautical Engineering Shenyang China College of Science Institute of Dalian Nationalities Dalian China

Current patch test for Mindlin plate element only satisfies the zero shear deformation *** patch test of non-zero constant shear for Mindlin plate problem cannot be *** shell element, the patch test does not even *** on the theory of enhanced patch test proposed by Chen W J (2006),the authors proposed the enhanced patch test function for Mindlin plate and thin cylindrical shell *** enhanced patch test function can be used to assess the convergence of the Mindlin plate and cylindrical thin shell elements.

关键词： Mindlin plate thin cylindrical shell finite element enhanced patch test test function

Metal Organic Deposition of Lanthanum Zirconate Buffer Layer on Biaxially Textured Ni-5%W Substrate

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稀有金属材料与工程 2011年第S3期40卷 306-310页

作者： Guo Pei, Zhao Xiaohui, Xiong Jie, Xia Yudong, Jing Tongguo, Chen Jue,Zhang Ning, Zhang Fei, Tao Bowan, Li Yanrong State Key laboratory of Electronic thin films and Integrated Devices,University of Electronic Science and Technology of china,Chengdu,610054,china Univ Elect Sci & Technol china State Key Lab Elect Thin Films & Integrated Devic Chengdu 610054 Peoples R China

In this study,a simple template consisted of Y2O3 and La2Zr2O7 (LZO) layers was fabricated on rolling assisted biaxially textured Ni-5at%W substrates for YBa2Cu3O7-δ (YBCO) coated conductors.A thin sputtered Y2O3 layer (～20 nm) was introduced as a seed layer in order to induce epitaxial growth of metal organic deposited LZO *** effects of Y2O3 layer,annealing temperature and dwelling time on the phase and texture of the LZO films were systematically investigated.X-ray diffraction exhibited that the LZO films were purely c-axis-oriented with full width at half maximum value of out-of-plane and in-plane less than 4° and 6° *** force microscope analysis indicated the surface of such films was smooth,dense and crack-free.1.2μm-thick YBCO films were prepared directly on this 2-layer template with a critical current density of 0.58 MA/cm2 at 77 K and self field and Ic value of 70 A/cm-width,indicating a combination of LZO/Y2O3 is a promising buffer architecture for low cost production of high performance coated conductors.

关键词： La2Zr2O7 buffer layer MOD YBCO coated conductors

Microstructures and fatigue-free properties of the La^(3+) and Nd^(3+) doped Bi_4Ti_3O_(12) thin films prepared by modified sol-gel technique

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Science china(Technological Sciences) 2008年第11期51卷 1843-1849页

作者： LI MeiYa1,2, PEI Ling1, LIU Jun1, YU BenFang1, GUO DongYun1, SUN XiaoHua3 & ZHAO XingZhong1,2 1 Department of Electronic Science and Technology, School of Physical Science and Technology, Wuhan University, Wuhan 430072, china 2 Key laboratory of Acoustic and Photonic Material and Device of the Ministry of Education, Wuhan Uni- versity, Wuhan 430072, china 3 School of Mechanical and Material Engineering, china Three Gorges University, Yichang 443002, china Department of Electronic Science and Technology School of Physical Science and Technology

Ferroelectric Bi3.25La0.75Ti3O12 (BLT) and Bi3.15Nd0.85Ti3O12 (BNT) thin films were fab- ricated on Pt/TiO2/SiO2/Si (100) substrates by a modified sol-gel technique. X-ray diffraction indicated that these films were of single phase with random polycrystal- line orientations. The surface morphologies of the films were observed by scanning electron microscope, showing uniform, dense films with grain size of 50―100 nm. Well-saturated hysteresis loops of the films were obtained in metal-ferroelectric- metal type capacitors with Cu top electrodes at an applied voltage of 400 kV/cm, giving the remanent polarization (2Pr) and coercive field (2Ec) values of the films of 25.1 μC/cm2 and 203 kV/cm for BLT, and 44.2 μC/cm2 and 296 kV/cm for BNT, re- spectively. Moreover, these capacitors did not show fatigue behaviors after up to 1.75×1010 switching cycles at the test frequency of 1 MHz, suggesting a fatigue-free character. The influences of the La3+ and Nd3+ doping on the properties of the films were comparatively discussed.

关键词： bismuth oxides ferroelectrics fatigue sol-gel technique

Continuous Deposition of Double-sided Y_2O_3/YSZ/CeO_2 Buffer Layers for Coated Conductors

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稀有金属材料与工程 2011年第S3期40卷 311-314页

作者： Xia Yudong, Zhang Fei, Zhang Ning, Zhang Junfei, Chai Gang, Guo Pei, Jing Tongguo, Xiong Jie, Zhao Xiaohui, Tao Bowan, Li Yanrong State Key laboratory of Electronic thin films and Integrated Devices, University of Electronic Science and Technology of china, Chengdu 610054, china Univ Elect Sci & Technol china State Key Lab Elect Thin Films & Integrated Devic Chengdu 610054 Peoples R China

In this paper, we report a continuous deposition method for double-sided CeO2/YSZ/Y2O3 buffer layers by reel-to-reel in a D.C. magnetron reactive sputtering system. X-ray diffraction exhibited all the samples were highly c-axis oriented and atomic force microscope observations revealed a smooth, dense and crack-free surface morphology. Out-of-plane, in-plane texture, and surface roughness of multi-buffer layers were improved under optimized deposition conditions. Full width at half maximum (FWHM) values of out-of-plane and in-plane were about 4° and 5.5° in 50 cm double-sided buffed template. YBa2Cu3O7-δ films with thickness of 1.2 μm were deposited on both sides of the buffed tape. Both sides showed similar critical current density, Jc (77 K, self field) as 0.8 MA/cm2 and 0.7 MA/cm2, respectively.

关键词： continuous deposition double-sided Y2O3/YSZ/CeO2 buffer layers

Effects of annealing on structural, optical and electrical properties of Al-doped ZnO thin films

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Science china(Physics,Mechanics & Astronomy) 2004年第5期47卷 588-596页

作者： CHEN Yanwei1,2, YU Wenhua1 & LIU Yichun1,2 1. Centre for advanced Optoelectronic Functional Material Research, Northeast Normal University, Changchun 130024, china 2. Key laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130021, china Centre for advanced Optoelectronic Functional Material Research Northeast Normal University Changchun China Key laboratory of Excited State Processes Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun China

In this paper, the structural, electrical and optical properties of Al-doped zinc oxide (ZnO: Al) thin films onto quartz substrates prepared by electron beam evaporation technique were studied. All samples are polycrystal with a hexagonal structure andc-axis preferred orientation. The intense UV emissions and weak deep-level green emissions were observed. The films show high transparency, conductivity and high carrier concentration. Van der Pauw measurements show that the films are n-type degenerate semiconductor. The lowest resistivity is 6.7×10?4 Ω⊙cm at room temperature. These films exhibit a carrier density above 1020 cm?3. The conduction mechanism was discussed. The behavior of metallic conduction can be observed in the high temperature range.

关键词： ZnO: Al thin film, photoluminescence, electrical properties, structural properties, Van der Pauw measurement.

A new method to prepare clean cuticular membrane from fossil leaves with thin and fragile cuticles

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Science china Earth Sciences 2011年第2期54卷 223-227页

作者： WANG Li1,2 & LENG Qin1,3 1 State Key laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,china 2 Graduate School of Chinese Academy of Sciences,Beijing 100049,china 3 Department of Science and Technology,Bryant University,Smithfield RI 02917,USA State Key laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing China Graduate School of Chinese Academy of Sciences Beijing China Department of Science and Technology Bryant University Smithfield USA

Leaf cuticle analysis has long been a powerful tool for fossil plant identification, systematics, and palaeoclimatological recon- struction. In recent decades the application of stomatal frequency data that are relied on precise calculation of stomata on plant fossil cuticles to reconstruct ancient atmospheric CO2 concentration made the preparation of cuticular membrane with sufficient size a critical technique in palaeoclimatological research. However, for plants with originally thin and fragile cuticles, e.g., most deciduous plants, conventional techniques sometimes fail to obtain cuticular membranes with sufficient size, or sometimes unable to recover any. This has largely hampered the usage of fossil cuticle analysis in palaeobotanical and palaeo- climatological research. Here, we describe a new method using clear nail polish as a medium to ＂strengthen＂ the originally thin and fragile cuticles prior to maceration procedures. We demonstrate the method by using middle Eocene Metasequoia fossils that were notorious for the difficulty of recovering large-sized clean cuticular membranes due to their thin and fragile nature. Metasequoia, with well-documented and widely-distributed fossil records since the Late Cretaceous and with a living repre- sentative, 114. glyptostroboides, as a comparative reference, bas been widely used as a model genus for the study of evolution of plants, palaeoclimatological reconstruction, and plant adaptation to climate changes. But its deciduous habit produces thin cuticles and makes the preparation of clean cuticular membranes a tedious process. The new method successfully allows us to recover its delicate cuticular membranes with sufficient sizes for SEM observation and stomatal frequency analysis.

关键词： fossil leaf cuticle Metasequoia new method thin and fragile cuticle SEM observation stomatal frequency CO2

Carbon Nitride thin films Deposited by Plasma Assisted Nd∶YAG Laser Ablation of Graphite in N2+H2 Atmosphere

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Chinese Journal of Lasers 2001年第6期10卷 56-60页

作者： YU Wei WANG Shufang ZHANG Lianshui LI Xiaowei FU Guangsheng (College of Physics Science and Technology, hebei University, Baoding 071002, china) 河北大学物理科学与技术学院河北保定 071002

Carbon nitride thin films are deposited on silicon wafers by 532 nm Nd∶YAG laser ablation of graphite in the N 2+H 2 atmosphere assisted by a dc glow discharge plasma at a higher gas pressure of about 4.0 kPa. The properties of the thin films are investigated by scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) and X-ray diffraction (XRD). The results show that the deposited films are composed of α-C 3N 4, β-C 3N 4 phase and have the N/C atomic ratio of 2.01. The optical emission spectroscopy (OES) studies indicate that the introduction of a dc glow discharge and the adoption of a higher gas pressure during the film deposition are favorable to the net generation of the atomic N, CN radicals and N + 2 in B 2Σ + u excited state in the plasma, which are considered to play a major role in the synthesis of carbon nitride.

关键词： pulsed laser deposition dc glow discharge carbon nitride

Effect of fabrication parameters on the microstructure,in-plane anisotropy and magnetostriction of Fe-Ga thin films

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Rare Metals 2010年第6期29卷 583-588页

作者： WANG Bowen HUANG Wemnei CAO Shuying DU Yong HE Yuehui HUANG Baiyun Province-Ministry Joint Key laboratory of Electromagnetic Field and Electrical Apparatus Reliability Hebei University of TechnologyTianjin 300130China International Center for Materials Physics Chinese Academy of SciencesShenyang 110015China State Key laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

The microstructure,in-plane anisotropy,and magnetic properties of Fe-Ga thin films were investigated by X-ray diffraction analysis,vibrating sample magnetometer,and capacitive cantilever *** in-plane induced anisotropy is well formed by the applied magnetic field during sputtering,and the anisotropy field Hk decreases with the sputtering power *** coercivity of Fe-Ga thin films decreases with increasing power when the sputtering power is less than 60 W and increases when the power is larger than 60 *** magnetostriction of the thin films reaches 66 × 10-6 at the sputtering power of 60 *** Fe-Ga films,which exhibit good field sensitivity,low coercivity and high magnetostriction,have been fabricated at the power of 60 W,and they can be used as the materials of magnetostrictive transducers.

关键词： metallic thin films magnetostriction magnetron sputtering anisotropy