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Synthesis of the CuInSe_2 thin film for solar cells using the electrodeposition technique and Taguchi method

第十一届新型太阳能材料科学与技术学术研讨会

作者： Yong-xiang Sun Yun-fei Song wei-long liu Hong-lin Wu Qin Chen Li-lin Jiang School of Materials Science and Engineering Guilin University of Electronic Technology Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid PhysicsChina Academy of Engineering Physics School of Physics Harbin Institute of Technology College of Education and Music Hezhou University School of Artificial Intelligence Hezhou University

Ultrafast vibrational dephasing dynamics of 9,10-bis（phenylethynyl）anthracene （BPEA）thin films were revealed by femtosecond coherent anti-stokes Raman scattering spectroscopy （fs-CARS）.Dephasing times （T） of 2.60,2.98,3.72,and 1.64 ps were acquired at 1213,1300,1400,and 1478 cm vibrations,*** steady-state Raman and fast Fourier transform spectra,the dephasing dynamics generated by coherently excited Raman modes 1213 （1478） cm were fitted with 94 （77） cm quantum beat frequencies,with a combination of slow constantsτ=5.92 （2.76） ps and fast constantsτ=1.65 （1.98） *** lifetimes could be ascribed to the time scales associated with the structural changes for the C=C Raman modes in the BPEA thin ***,it is very significant to distinctly understand the underlying ultrafast vibrational dephasing dynamics of the electronic ground state of BPEA caused by vibrational structure changes,which benefits to improve sustainably the molecular device for efficient solar energy conversion.

关键词： Ultrafast vibrational dephasing dynamics Coherent anti-stokes Raman scattering

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International Journal of Minerals,Metallurgy and Materials 2009年第1期16卷 101-107页

作者： wei-long liu Shu-huei Hsieh Wen-jauh Chen Pei-i wei Jing-herng Lee Department of Materials Science and Engineering Huwei Institute of Technology Yunlin China Taipei Graduate Institute of Materials Science Yunlin University of Science and Technology Yunlin China Taipei

The Taguchi method was used to obtain the optimum electrodeposition parameters for the synthesis of the CuInSe2 thin film for solar cells. The parameters consist of annealing temperature, current density, CuCl2 concentration, FeCl3 concentration, H2SeO3 concentration, TEA amount, pH value, and deposition time. The experiments were carried out according to an L18（2^13^7） table An X-ray diffractometer （XRD） and a scanning electron microscope （SEM） were respectively used to analyze the phases and observe the microstructure and the grain size of the CuInSe2 film before and after annealing treatment. The results showed that the CuInSe2 phase was deposited with a preferred plane （112） parallel to the substrate surface. The optimum parameters are as follows： current density, 7 mA/cm^2; CuCl2 concentration, 10 mM; FeCl3 concentration, 50 mM; H2SeO3 concentration, 15 mM; TEA amount, 0 mL; pH value, 1.65; deposition time, 10 min; and annealing temperature, 500℃.

关键词： CuInSe2 (CIS) thin film solar cell electrodeposition Taguchi method

Interface structure between epitaxial NiSi_2 and Si

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Journal of University of Science and Technology Beijing 2006年第6期13卷 558-563页

作者： wei-long liu Wen-Jauh Chen Ting-Kan Tsai Hsun-Heng Tsai Shu-Huei Hsieh Department of Materials Engineering Formosa University Yunlin China Taipei Graduate Institute of Materials Engineering Pingtung University of Science and Technology 1 Pingtung China Taipei Department of Biosystems Engineering Pingtung University of Science and Technology 1 Pingtung China Taipei

The interface structure between the Si and NiSi2 epitaxially grown on the （112） Si substrate was studied using high resolution transmission electron microscopy and computer image simulation. The results showed that the interface between Si and NiSi2 epitaxially grown on the （ 112 ） Si substrate has six different types： type A NiSi2 （111 ）/（ 111 ） Si, type A NiSi2 （001）/（001） Si, type B NiSi2 （ 111 ）/（ 111） Si, type B NiSi2 （ 112 ）/（ 1 12 ） Si, type B NiSi2 （ 271 ）/（001） Si, and type B NiSi2 （ 114 ）/（ 110 ） Si. And there are one or more different atomic structures for one type of interface.

关键词： nickel silicide interface high resolution image simulation atomic structure

Growth behavior of electroless copper on silicon substrate

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Journal of University of Science and Technology Beijing 2007年第1期14卷 67-71页

作者： Shin-Shyan Wu wei-long liu Ting-Kan Tsai Shu-Huei Hsieh Wen-Jauh Chen Institute of Electro-Optical and Materials Science Formosa University Yunlin China Taipei Department of Materials Science and Engineering Formosa University Yunlin China Taipei Graduate Institute of Materials Engineering Pingtung University of Science and Technology Pingtung China Taipei

The growth behavior containing deposit morphology, growth rate, activation energy, and growth mechanism of copper on silicon substrate, especially at the initial stage, in the electroless plating process was studied. Copper was deposited on the surface of the silicon substrate in an electloless plating bath containing formalin （CH2O 37vol%） as a reducing agent at a pH value of 12.5 and a temperature of 50-75℃. The copper deposit was characterized using a field emission scanning electron microscope and transmission electron microscope. The results showed that after the activation process, nanoscale Pd particles were distributed evenly on the surface of the silicon; in the deposition process, copper first nucleated at locations not only near the Pd particles but also between the Pd particles; the growth rate of electroless Cu ranged from 0.517 nm/s at 50℃ to 1.929 nm/s at 75℃. The activation energy of electroless Cu on Si was 52.97 kJ/mol.

关键词： electroless copper silicon substrate activation energy growth mechanism

Impacts of multi-foulings on salinity gradient energy conversion process in negatively charged conical nanochannels

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Science China(Technological Sciences) 2024年第6期67卷 1714-1726页

作者： MAO RuiJie CHEN Xi ZHOU RuHong long Rui liu ZhiChun liu wei School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan430074China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and TechnologyWuhan430074China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan430074China

Membrane fouling inevitably occurs during nanofluidic reverse ***,the impact of multi-fouling on the energy conversion performance of negatively charged conical nanochannels under asymmetrical configurations is systematically *** results reveal that in Configuration I,where a high-concentration solution is applied at the tip side,at small concentration ratios,multiple foulings reduce the electric *** Configuration II,where a low-concentration solution is applied at the tip side,multiple foulings near the base side contribute to the electric *** fouling that formed near the lowconcentration entrance diminished the electric power and energy conversion ***-fouling lowered the electrical power consumption by 69.27%and 99.94%in Configurations I and II,*** Configuration I,the electric power first increased with increasing fouling surface charge density,reached its maximum value,and thereafter *** Configuration II,the electric power first decreased with increasing fouling surface charge density,reached its minimum value,and thereafter *** negative or positive charge densities of fouling contribute to the electric power and energy conversion efficiency.

关键词： conical nanochannel fouling nanofluidic reverse electrodialysis salinity gradient energy

Solvent Effects on Spectral Property and Dipole Moment of the Lowest Excited State of Coumarin 343 Dye

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Chinese Journal of Chemical Physics 2012年第5期25卷 577-584,I0004页

作者： Li-lin Jiang wei-long liu Yun-fei Song Xing He Yang Wang Hong-lin Wu Yan-qiang Yang Center for the Condensed Matter Science and Technology Department of PhysicsHarbin Instituteof TechnologyHarbin 150001China Department of Physics and Electronics Information Engineering Hezhou UniversityHezhou 542800China

Steady-state absorption and fluorescence spectra, and time-resolved fluorescence spectra of coumarin 343 （C343） were measured in different solvents. The effect of the solvent on the spectral properties and dipole moment of the lowest excited state of C343 were investigated. It was found that the absorption and fluorescence spectra red-shifted slightly and strongly with increasing solvent polarity, respectively, because the charge distribution of the excited state leaded to the increasing difference between the absorption and fluorescence spectra with increasing solvent polarity. The dipole moment of the lowest excited state of C343 was determined from solvatochromic measurements and the quantum chemical calculation, and the results obtained from these two methods were fully consistent. Investigations of the time-resolved fluorescence of C343 in different solvents indicated that the fluorescence lifetimes increased nearly linearly with 4.45 ns in water. This can be ascribed between C343 and hydrogen donating increasing solvent polarity from 3.09 ns in toluene to to the intermolecular hydrogen bonding interactions solvents

关键词： Time-resolved fluorescence Dipole moment Solvent polarity function Quan-tum chemical calculation Intermolecular hydrogen bonding interaction

Research progress on micro-force measurement of a hydrate particle system

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Petroleum Science 2024年第4期21卷 2169-2183页

作者： Qiang Luo wei Li Zhi-Hui liu Feng Wang Zhi-Chao liu Fu-long Ning Faculty of Engineering China University of Geosciences (Wuhan) Suzhou Laboratory

It remains a great challenge to understand the hydrates involved in phenomena in practical oil and gas systems. The adhesion forces between hydrate particles, between hydrate particles and pipe walls, and between hydrate particles and reservoir particles are essential factors that control the behaviors of clathrate hydrates in different applications. In this review, we summarize the typical micro-force measurement apparatus and methods utilized to study hydrate particle systems. In addition, the adhesion test results, the related understandings, and the applied numerical calculation models are systematically discussed.

关键词： Clathrate hydrates Hydrate particle Micro-force measurements Adhesion Interactions

Interface Design Strategy for GNS/AZ91 Composites with Semi-Coherent Structure

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Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 467-483页

作者： Jing-Peng Xiong Yi-Qi Zeng Jin-long liu wei-Cheng Wang Lan Luo Yong liu Key Laboratory of Lightweight and High Strength Structural Materials of Jiangxi Province School of Advanced ManufacturingNanchang UniversityNanchang 330031China School of Physics and Materials Science Nanchang UniversityNanchang 330031China

The interfacial structure plays an important role in the mechanical properties of magnesium matrix composite(MMCs)reinforced with graphene nanosheet(GNS)due to their poor wettability with the Mg *** interface design strategy was proposed to form the semi-coherent interfacial structure with superior bonding *** lattice mismatch and interfacial bonding strength between Mg/rare earth oxide/carbon were utilized as key characteristics to evaluate the interfacial *** oxide(La2O3)was selected as the intermediate candidate due to its low lattice mismatch and high interfacial bonding *** identify the interfacial structure of Mg/La2O3/graphene,first-principles calculations were conducted to calculate the ideal work of separation and electronic structure of the *** demonstrated the presence of strong ionic and covalent interactions at the interface,which theoretically verified the strong interfacial bonding strength among Mg/La2O3/graphene *** experimentally validate the interface strength,MMCs with the interface structure of Mg/La2O3/GNS were *** formation of in-situ La2O3 led to the successful attainment of semi-coherent structures between Mg/La2O3 and La2O3/GNS,resulting in high strength and good ductility of the ***,this work proposes a new approach to interface design in MMCs with an enhancement of mechanical properties.

关键词： Interface design strategy Magnesium matrix composite Graphene nanosheets Semi-coherent interface Mechanical properties

Multi-scale modeling for prediction of mechanical performance in brazed GH99 thin-walled structure

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Chinese Journal of Aeronautics 2024年第7期37卷 550-563页

作者： Yazhou liu Shengpeng HU Yanyu SONG wei FU Xiaoguo SONG Ning GUO weimin long State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Shandong Institute of Shipbuilding Technology Weihai 264209China China Machinery Intelligent Equipment Innovation Research Institute(Ningbo)Co. Ltd.Ningbo 315700China

Superalloy thin-walled structures are achieved mainly by brazing,but the deformation process of brazed joints is non-uniform,making it a challenging research *** paper records a thorough investigation of the effect of brazing parameters on the microstructure of joints and its mechanical properties,which mainly inquires into the deformation and fracture mechanisms in the shearing process of GH99/BNi-5a/GH99 *** macroscopic-microscopic deformation mechanism of the brazing interface during shearing was studied by Crystal Plasticity(CP)and Molecular Dynamics(MD)on the basis of the optimal brazing *** experimental results show that the brazing interface is mainly formed by(Ni,Cr,Co)(s,s)and possesses a shear strength of approximately 546 *** shearing fracture of the brazed joint occurs along the brazing seam,displaying the characteristics of intergranular *** simulations show that dislocations disassociate and transform into fine twinning with increased *** simulated the shear deformation process of the brazed *** multiscale simulation results are consistent with the experimental *** mechanical properties of thin-walled materials for brazing are predicted using MD and CP methods.

关键词： Multi-scale modeling Brazing Shear mechanisms Crystal plasticity GH99 superalloy

Isogeometric Analysis of Hyperelastic Material Characteristics for Calcified Aortic Valve

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Computer Modeling in Engineering & Sciences 2024年第6期139卷 2773-2806页

作者： long Chen Ting Li Liang liu Wenshuo Wang Xiaoxiao Du wei Wang School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai200093China Department of Cardiac Surgery Zhongshan HospitalFudan UniversityShanghai200093China School of Mechanical Engineering and Automation Beihang UniversityBeijing100191China

This study explores the implementation of computed tomography(CT)reconstruction and simulation techniques for patient-specific valves,aiming to dissect the mechanical attributes of calcified valves within transcatheter heart valve replacement(TAVR)*** order to facilitate this exploration,it derives pertinent formulas for 3D multi-material isogeometric hyperelastic analysis based on Hounsfield unit(HU)values,thereby unlocking foundational capabilities for isogeometric analysis in calcified aortic valves.A series of uniaxial and biaxial tensile tests is executed to obtain an accurate constitutive model for calcified active *** mitigate discretization errors,methodologies for reconstructing volumetric parametric models,integrating both geometric and material attributes,are *** these analytical formulas,constitutive models,and precise analytical models to isogeometric analyses of calcified valves,the research ascertains their close alignment with experimental results through the close fit in displacement-stress curves,compellingly validating the accuracy and reliability of the *** study presents a step-by-step approach to analyzing themechanical characteristics of patient-specific valves obtained fromCT images,holding significant clinical implications and assisting in the selection of treatment strategies and surgical intervention approaches in TAVR procedures.

关键词： Calcified aortic valves tensile test constitutive relations CT reconstruction isogeometric hyperelastic analysis