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Journal of Rare Earths 2015年第5期33卷 469-474页

作者：赵凤阳吕雁鹏周广洲朴贤卿孙卓 engineering research center for nanophotonics & advanced instrument Ministry of Education Department of Physics East China Normal University

Orange-red emitting （Sr0.883–xBa0.1Lu0.0.17Eux）3（Si0.95Al0.05）O5 phosphors were synthesized by conventional solid-state reac-tion. The effect of NH4F flux on structural and luminescent properties of phosphors was investigated. Results suggested that the opti-mal content of NH4F flux was 3 wt.%and the optimal doping concentration of Eu2＋was x=0.023 mol. The phosphors showed intense absorption in near-ultraviolet to blue region and exhibited orange-red emissions. The thermal stability of synthesized （Sr0.86Ba0.1Lu0.017Eu0.023）3（Si0.95Al0.05）O5 phosphor were examined and compared with commercial YAG：Ce3＋ yellow phosphors. Combining an InGaN blue 460 nm chip and a white-emitting （Sr0.86Ba0.1Lu0.017Eu0.023）3（Si0.95Al0.05）O5 phosphor produced a white-light LED, demonstrating CIE chromaticity coordinates of （0.314, 0.329） and a color temperature of 5595 K. All results showed that this phosphor is a promising candidate as orange-red emitting phosphor for white light emitting diode （w-LED） application.

关键词： Eu2+ silicate phosphor white LED optical properties rare earths

Magneto-Impedance Effect of Composite Wires Prepared by Chemical Plating under DC Current

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Nano-Micro Letters 2014年第3期6卷 227-232页

作者： D.L.Chen X.Li H.L.Pan H.Y.Luan Z.J.Zhao Department of Physics Engineering Research Center for Nanophotonics & Advanced Instrument Ministry of Education East China Normal University

CuBe composite wires of 100 μm in diameter coated with a layer of NiCoP were prepared by a chemical plating method under DC current(CPUDC). The influences of DC current on coating morphology,deposition rate, composition, giant magneto-impedance(GMI) effect and magnetic properties were *** was shown that the circumferential domain structure of coating layer was induced by the DC current going through the wires. A maximum GMI ratio of 870% was obtained in the composite wire prepared under 150 m A and tested at 180 k Hz. It is 30 times higher than that of the composite wire plated in the same condition by conventional chemical plating method, indicating that CPUDC is an easy and effective approach to obtain composite wires and its applications will be further extended on magnetic sensors.

关键词： GMI Chemical plating Magnetic properties

Effective Improvement of the Photovoltaic Performance of Carbon-Based Perovskite Solar Cells by Additional Solvents

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Nano-Micro Letters 2016年第4期8卷 347-357页

作者： Chenxi Zhang Yudan Luo Xiaohong Chen Yiwei Chen Zhuo Sun Sumei Huang engineering research center for nanophotonics & advanced instrument Ministry of EducationDepartment of PhysicsEast China Normal University

A solvent-assisted methodology has been developed to synthesize CH_3NH_3 PbI_3perovskite absorber *** involved the use of a mixed solvent of CH_3NH_3 I,PbI_2,c-butyrolactone,and dimethyl sulfoxide(DMSO) followed by the addition of chlorobenzene(CB).The method produced ultra-flat and dense perovskite capping layers atop mesoporous TiO_2 films,enabling a remarkable improvement in the performance of free hole transport material(HTM) carbon electrode-based perovskite solar cells(PSCs).Toluene(TO) was also studied as an additional solvent for *** the annealing temperature of 100 °C,the fabricated HTM-free PSCs based on drop-casting CB demonstrated power conversion efficiency(PCE) of 9.73 %,which is 36 and 71 % higher than those fabricated from the perovskite films using TO or without adding an extra solvent,*** interaction between the PbI_2–DMSO–CH_3NH_3I intermediate phase and the additional solvent was ***,the influence of the annealing temperature on the absorber film formation,morphology,and crystalline structure was investigated and correlated with the photovoltaic *** efficient,simple,and stable HTM-free solar cells with a PCE of 11.44 % were prepared utilizing the optimum perovskite absorbers annealed at 120 °C.

关键词： Halide perovskite Solar cell Spin-coating Carbon counter electrode Free hole transporting material

Sonochemical synthesis of silver nanoparticles coated copper wire for low-temperature solid state bonding on silicon substrate

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Chinese Chemical Letters 2019年第7期30卷 1455-1459页

作者： Qiang Hu Chen Zhao Zhejuan Zhang Jun Guo Chenlu Yu Zhuo Sun Xianqing Piao School of Physics & Material Science Engineering Research Center for Nanophotonics & Advanced Instrument Ministry of Education East China Normal University

Silver nanoparticles (AgNPs) are directly grown on surface of ~25 μm copper wire by ultrasound-assisted chemical reduction. Silver nitrate is used as precursors, when polyvinylpyrrolidone (PVP) is added as a controller of the dimension of AgNPs. Influence of growth parameters such as precursor's concentration, ratio proportion of PVP and ultra-sonication on the growth of AgNPs coating are determined. The best morphology, size of the AgNPs are observed on copper wire. The results show that the copper wire coated with AgNPs of^100 nm diameter exhibits good antioxidation and ohmic contact after sinter on Si substrate at a temperature as low as 320℃, is especially suitable as a substitute for silver paste electrode used in silicon solar cells.

关键词： Sonochemistry Ag-Cu copper wire Low-temperature sintering Solar cells Polyvinylpyrrolidone

Magnetic Tunnel Junction Based on MgO Barrier Prepared by Natural Oxidation and Direct Sputtering Deposition

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Nano-Micro Letters 2012年第1期4卷 25-29页

作者： Xiaohong Chen Paulo.P.Freitas engineering research center for nanophotonics and advanced instrument Ministry of Education Department of Physics East China Normal University INESC-MN

Magnetic tunnel junctions(MTJs) based on MgO barrier have been fabricated by sputtering single crystal MgO target and metal Mg target, respectively, using magnetic sputtering system Nordiko 2000. MgO barriers have been formed by a multi-step deposition and natural oxidization of Mg layer. Mg layer thickness,oxygen flow rate and oxidization time were adjusted and the tunnel magnetoresistance(TMR) ratio of optimal MTJs is over 60% at annealing temperature 385. The(001) MgO crystal structure was obtained when the separation distance between MgO target and substrate is less than 6 cm. The TMR ratio of most MgO based MTJs are over 100% at the separation distance of 5 cm and annealing temperature 340. The TMR ratios of MTJs are almost zero when the separation distance ranges from 6 to 10 cm, due to the amorphous nature of the MgO film.

关键词： Magnetic tunnel junctions Mg O Crystal structure Magnetic sputtering system

Fabrication and Evaluation of Low-cost Cu_2ZnSn(S,Se)_4 Counter Electrodes for Dyesensitized Solar Cells

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Nano-Micro Letters 2013年第4期5卷 281-288页

作者： Jie Shen Dingwen Zhang Junjie Li Xiaodong Li Zhuo Sun Sumei Huang engineering research center for nanophotonics & advanced instrument Ministry of Education Department of Physics East China Normal University advanced Materials Technology Centre Singapore Polytechnic

We explore a simple and eco-friendly approach for preparing CZTS powders and a screen-printing process for Cu_2ZnSn(S,Se)_4(CZTSSe) counter electrodes(CEs) in dye-sensitized solar cells(DSCs). Cu_2ZnSnS_4(CZTS) nanoparticles have been synthesized via a hydrazine-free solvothermal approach without the assistance of organic ligands. CZTS has been prepared by directly drop-casting the CZTS ink on the cleaned FTO glass, while CZTSSe CEs have been fabricated by screen-printing CZTS pastes, followed by post selenization using Se vapor obtained from elemental Se pellets. The crystal structure, composition and morphology of the as-deposited CZTS nanoparticles and CZTSSe electrodes are characterized by X-ray diffractometer, energy dispersive spectrometer, field emission scanning electron microscopy and transmission electron *** electrochemical properties of CZTS, CZTSSe and Pt CE based DSCs are examined and analyzed by electrochemical impedance spectroscopy. The prepared CZTS and CZTSSe CEs exhibit a cellular structure with high porosity. DSCs fabricated with CZTSSe CEs achieve a power conversion efficiency of 5.75% under AM 1.5 G illumination with an intensity of 100 m W/cm^2, which is higher than that(3.22%) of the cell using the CZTS CE. The results demonstrate that the CZTSSe CE possesses good electrocatalytic activity for the reduction of charge carriers in electrolyte. The comprehensive CZTSSe CE process is cheap and scalable. It can make large-scale electro-catalytic film fabrication cost competitive for both energy harvesting and storage applications.

关键词： Copper-zinc-tin-chalcogenide Selenization Counter electrode Dye-sensitized solar cells

Efficiency Enhancement of Inverted Polymer Solar Cells Using Ionic Liquid-functionalized Carbon Nanoparticles-modified ZnO as Electron Selective Layer

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Nano-Micro Letters 2014年第1期6卷 24-29页

作者： Feng Zhu Xiaohong Chen Zhe Lu Jiaxiang Yang Sumei Huang Zhuo Sun engineering research center for nanophotonics and advanced instrument Ministry of Educationand Department of PhysicsEast China Normal University Department of Chemistry Anhui University

ZnO thin film was fabricated on tin-doped indium oxide electrode as an electron selective layer of inverted polymer solar cells using magnetron sputtering deposition. Ionic liquid-functionalized carbon nanoparticles(ILCNs) film was further deposited onto ZnO surfaces by drop-casting ILCNs solution to improve interface properties. The power conversion efficiency(PCE) of inverted polymer solar cells(PSCs)with only ZnO layer was quickly decreased from 2.7% to 2.2% when the thickness of ZnO layer was increased from 15 nm to 60 nm. However, the average PCE of inverted PSCs with ZnO layer modified with ILCNs only decreased from 3.5% to 3.4%, which is comparable to that of traditional PSCs with poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) anode buffer layer. The results suggested that the contact barrier between ZnO layer and poly(3-hexylthiophene) and phenyl-C61-butyric acid methylester(P3HT:PCBM)blended film compared to ZnO bulk resistance can more significantly influence the performance of inverted PSCs with sputtered ZnO layer. The vanishment of negative capacitive behavior of inverted PSCs with ILCNs modified ZnO layer indicated ILCNs can greatly decrease the contact barrier of ZnO/P3HT:PCBM interface.

关键词： Polymer Solar cell ZnO

Structure,magnetic properties and giant magneto-striction studies in [Tb/Fe/Dy]_n nano-multilayer film

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Chinese Science Bulletin 2009年第4期54卷 608-611页

作者： LI XiaoDong ZHAO ZhenJie HUANG SuMei PAN LiKun CHEN YiWei YANG XieLong SUN Zhuo Department of Physics Engineering Research Center for Nanophotonics & Advanced Instrument Ministry of Education East ChinaNormal University Shanghai 200062 China

[Tb/Fe/Dy]n nano-multilayer films, with precise composition of Tb0.27Dy0.73Fe2, were prepared by the multi-targets magnetron sputtering technique at room temperature (sample A) and 300℃ substrate temperature (sample B). Both of the nano-multilayer films show columnar structures perpendicular to the film plane according to the scanning electron microscopy results. The magnetic hysteresis loops and the giant magnetostriction (GMS) property of the two samples indicate the perpendicular anisotropy in them. In spite of the perpendicular anisotropy, both of the samples present GMS effect. In a very low applied field of 0.18 T, the GMS value in sample B is 89.3 ppm, which is about four times of that in sample A, 23.5 ppm. The good low-field GMS effect in sample B might attribute to the Laves phase of R-Fe2 segregated from the amorphous matrix under the thermal annealing of the substrate. The relation between the magnetization process and GMS property of the perpendicular anisotropy nano-multilayer films is further investigated.

关键词：纳米多层模磁弹性效果正交各向异性 [铽/铁/镝]n纳米材料

Giant Magneto-impedance Effect in Composite Wires with Different Core Layer

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Nano-Micro Letters 2013年第2期5卷 140-144页

作者： R.L.Wang X.Li X.H.Kong Y.X.Guo J.Z.Ruan Z.J.Zhao Department of Physics Engineering Research Center for Nanophotonics & Advanced Instrument Ministry of Education East China Normal University Experimental Teaching center of Physics Shanghai Ocean University

Composite structure materials were potential sensing elements for magnetic sensors due to Giant magnetoimpedance(GMI) effect. Two kinds of composite wires with different magnetic/non-magnetic structures were fabricated by using electroless deposition methods and the magnetoimpedance properties were investigated. The maximum GMI ratio of 114% was acquired at 60 MHz in the composite wires with a ferromagnetic core, whereas, 116% of maximum GMI ratio was found in the composite wires with a conductive core at low frequency of 600 k Hz. These results exhibit that the GMI ratio reaches the maximum when magnetoresistance ratio ?R/R and magnetoinductance ratio ?X/X make the comparative contributions to the total magnetoimpedance(MI). The obvious GMI effect obtained in the composite wires with conductive core frequency may provide a candidate for applications in magnetic sensors, especially at low frequencies.

关键词： Composite wires Electroless deposition Giant Magnetoimpedance effect Resistivity

Stable all-perovskite tandems with interfacial dipole-bridged inorganic wide-bandgap perovskite subcells

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Science China Chemistry 2023年第9期66卷 2445-2446页

作者： Wenxiao Zhang Junfeng Fang School of Physics and Electronic Science Engineering Research Center of Nanophotonics&Advanced InstrumentMinistry of EducationEast China Normal UniversityShanghai 200241China

In a recent article published in Nature Energy, Hairen Tan,Edward H. Sargent and their co-authors [1] reported a strongly bonding dipole molecule at the perovskite/C60interface to reduce the energetic mismatch and acc... 详细信息

关键词： perovskite dipole inorganic