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Structural and Physical Properties of AsxSe100-x Glasses

Chinese Physics Letters 2014年第6期31卷 140-143页

作者：房明磊许峰魏文猴杨志勇 College of Science Anhui University of Science and Technology Huainan 232001 The Centre for 3D Printing Technology Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 School of Physics and Electronic Engineering 3iangsu Normal University Xuzhou 221116

We prepare the samples of AsxSe100-x glasses with x = 20, 31, 40 and 50, and measure the glass-transition temperatures Tg, the density and elastic, and optical properties of the glasses. The density, elastic constants and third optical nonlinearity coefficient are found to exhibit the maximal values for the As40Se6o composition. Analysis of x-ray photoelectron spectra of these AsxSe100-x glasses indicate that the chemically stoichiometric As40Se60 consists of perfect corner-sharing pyramidal AsSe3/2 units, while the others contain defect bonds such as As-As and Sere. The optical nonlinearity does not correlate with the concentration of Se, contrary to the report by Quemard et al for Ge-Se Masses.

关键词： selenium compounds

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Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films

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Chinese Physics Letters 2014年第1期31卷 156-160页

作者：张文号孙袆张金松李坊森郭明华赵弇斐张慧敏彭俊平邢颖王慧超 FUJITA Takeshi HIRATA Akihiko 李志丁浩汤辰佳王萌王庆艳何珂季帅华陈曦王俊峰夏正才李亮王亚愚王健王立莉陈明伟薛其坤马旭村 State Key Lab of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 International Center for Quantum Materials School of Physics Peking University Beijing 100871 Collaborative Innovation Center of Quantum Matter Beijing Institute of Physics Chinese Academy of Sciences Beijing 100190 WPI Advanced Institute for Materials Research Tohoku University Sendai 9808577 Japan Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Vguhan 430071

We prepared one-unit-ceil （1-UC） thick FeSe films on insulating SrTiOa substrates with non-superconducting FeTe protection layers by molecular beam epitaxy for ex situ studies. By direct transport and magnetic measurements, we provide definitive evidence for high temperature superconductivity in the 1-UC FeSe films with an onset Tc above 40 K and an extremely large critical current density fie Jc-1.7× 106 A/cm2 at 2K, which are much higher than Tc-8K and Jc-104 A/cm^2 for bulk FeSe, respectively. Our work may pave the way to enhancing and tailoring superconductivity by interface engineering.

关键词： selenium compounds

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Fabrication of high-quality ZnS buffer and its application in Cd-free CIGS solar cells

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Optoelectronics Letters 2014年第4期10卷 266-268页

作者：李凤岩党向瑜张力刘芳芳孙顶何青李长健李宝璋朱红兵 Tianjin Key Laboratory for Photoelectronic Thin Film Devices and Technology Nankai University College of Physics Science & Technology Hebei University

This paper provides the fabrication of Cd-free Cu(In,Ga)Se2(CIGS) solar cells on soda-lime glass substrates. A high quality ZnS buffer layer is grown by chemical bath deposition(CBD) process with ZnSO4-NH3-SC(NH2)2 aqueous solution system. The X-ray diffraction(XRD) result shows that the as-deposited ZnS film has cubic(111) and(220) diffraction peaks. Scanning electron microscope(SEM) images indicate that the ZnS film has a dense and compact surface with good crystalline quality. Transmission measurement shows that the optical transmittance is about 90% when the wavelength is beyond 500 nm. The bandgap(Eg) value of the as-deposited ZnS film is estimated to be 3.54 eV. Finally, a competitive efficiency of 11.06% is demonstrated for the Cd-free CIGS solar cells with ZnS buffer layer after light soaking.

关键词： Buffer layers Gallium alloys Scanning electron microscopy selenium compounds Substrates X ray diffraction Zinc sulfide

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