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arXiv 2020年

作者： Liu, Xiao-Long Zhao, Yang Wang, Wen-Jing Ma, Sheng-Xiang Ning, Xi-Jing Zhao, Li Zhuang, Jun The Shanghai Ultra-Precision Optical Manufacturing Engineering Center Department of Optical Science and Engineering Fudan University Shanghai200433 China The Applied Ion Beam Physics Laboratory Institute of Modern Physics Department of Nuclear Science and Technology Fudan University Shanghai200433 China The State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China The Collaborative Innovation Center of Advanced Microstructures Fudan University Shanghai200433 China

The self-powered sensing system could harness ambient energy to power the sensor without the need for external electrical energy. Recently, the concept of photovoltaic (PV) self-powered gas sensing has aroused wider attentions due to room-temperature operation, low power consumption, small size and potential applications. The PV self-powered gas sensors integrate the photovoltaic effects and the gas sensing function into a single chip, which could truly achieve the goal of zero power consumption for an independent gas sensing device. As an emerging concept, the PV self-powered gas sensing has been achieved by using different strategies, including integrated gas sensor and solar cell, integrated light filter and solar cell, gas-sensitive heterojunction photovoltaics, and gas-sensitive lateral photovoltaics, respectively. The purpose of this review is to summarize recent advances of PV self-powered gas sensing and also remark on the directions for future research in this topic. © 2020, CC BY-NC-ND.

关键词： Gas detectors

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Pseudohalide induced tunable electronic and excitonic properties in two-dimensional single-layer perovskite for photovoltaics and photoelectronic applications

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Journal of Energy Chemistry 2019年第9期28卷 106-113页

作者： Zhuo Xu Ming Chen Shengzhong(Frank)Liu Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Normal UniversityXi'an 710119 Shaanxi China Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Normal UniversityXi'an 710119 Shaanxi China Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials Shaanxi Normal UniversityXi'an 710119 Shaanxi China School of Materials Science and Engineering Shaanxi Normal UniversityXi'an 710119 Shaanxi China iChEM Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China University of the Chinese Academy of Sciences Beijing 100039 China

Two-dimensional(2D) layered organic-inorganic hybrid perovskites have attracted much more attention for some applications than their three-dimensional(3D) perovskite counterparts due to their promising thermal and moisture *** particular, the 2D perovskite devices have shown better promise for optoelectronic ***, tunability of optoelectronic properties is often demanded to improve the device ***, we adopt a newly method to tune the electronic properties of 2D perovskite by introducing pseudohalide into the *** this work, we designed a pseudohalidesubstituted 2D perovskite by substituting the out-of-plane halide with pseudohalide and studied the electronic and excitonic properties of 2D-BA2MX4 and 2D-BA2MX2Ps2(M=Ge^(2+), Sn^(2+), and Pb^(2+);X=I;Ps=NCO, NCS, OCN, SCN, Se CN).We revealed the dependence of electronic properties including band gaps, composition of band edges, bonding characteristics, work functions, effective masses, and exciton binding energies on different pseudohalides substituted in 2D *** results indicate that the substitution of pseudohalide in 2D perovskites is energetically favorable and can significantly affect the bonding characteristics as well as the CBM and VBM that often play major role in determining their performance in optoelectronic *** is expected that the pseudohalide substitution will be helpful in developing more advanced optoelectronic device based on 2D perovskite by optimizing band alignment and promoting charge extraction.

关键词： Two-dimensional perovskites Pseudohalides Density functional theory Electronic and excitonic properties

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Frontispiece: Detection of Reactive Oxygen and Nitrogen Species by Upconversion Nanoparticle-Based Near-Infrared Nanoprobes: Recent Progress and Perspectives

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Chemistry – A European Journal 2022年第65期28卷

作者： Xiaokan Yu Wenao Ouyang Dr. Hao Qiu Zhijun Zhang Prof. Zhimin Wang Prof. Bengang Xing Department of Chemistry Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province Zhejiang Sci-Tech University Hangzhou 310018 China Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of Technology Beijing 10008 China Division of Chemistry and Biological Chemistry School of Chemistry Chemical Engineering & Biotechnology Nanyang Technological University Singapore 637371 Singapore

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Low-temperature-gradient crystallization for multi-inch high-quality perovskite single crystals for record performance photodetectors

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Materials Today 2019年 22卷 67-75页

作者： Yucheng Liu Yunxia Zhang Zhou Yang Jiangshan Feng Zhuo Xu Qingxian Li Mingxin Hu Haochen Ye Xu Zhang Ming Liu Kui Zhao Shengzhong(Frank) Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi’an 710119 China iChEM Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education & International Center for Dielectric Research Xi'an Jiaotong University Xi'an 710049 China

With their excellent optoelectronic properties, the practical application of single-crystalline organolead halide perovskite materials is now limited by the lack of a method to prepare high-quality perovskite single crystals in large dimension. Herein, we report our development of a low-temperature-gradient crystallization (LTGC) method for high-quality CH 3 NH 3 PbBr 3 (MAPbBr 3 ) perovskite single crystals with lateral dimension as large as two inches. The theoretical analysis suggests that a small temperature gradient should be used to restrain the growth condition, particularly the solution concentration, within the optimal single-crystal-growth (OSCG) zone. The solubility curve as a function of temperature reveals a sharp turning point at ∼60 °C, across which the first-order solubility derivative (dC/dT) shows very different behaviors: below this temperature, the dC/dT changes dramatically as the temperature increases, while above this temperature, the dC/dT enters a plateau where further temperature change has little effect on the derivative, meaning that one can attain both a substantial crystal growth rate and crystallization yield below this temperature. Utilizing this discovery, a MAPbBr 3 single crystal as large as 47 × 41 × 14 mm is obtained with high quality via the LTGC method. The single crystal exhibits the best optoelectronic quality among all MAPbBr 3 materials reported in the literature, including the best trap state density, mobility, carrier lifetime, and diffusion length. These superior optoelectronic properties are further transferred into a high-performance planar photodetector. The device exhibits high operational stability, high external quantum efficiency (13,453%), excellent detectivity as high as 8 × 10 13 Jones, and a fast response speed as quick as 15.8 μs. To our knowledge, both the detectivity and the response speed are the best among all MAPbBr 3 devices reported to date. The unique synthesis method and excellent crystalline quality

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Magnetotransport in Al6Re

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Physical Review B 2019年第5期100卷 054509-054509页

作者： Erjian Cheng Darren C. Peets Chuanying Xi Yeyu Huang Li Pi Shiyan Li State Key Laboratory of Surface Physics Department of Physics and Laboratory of Advanced Materials Fudan University Shanghai 200438 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo Zhejiang 315201 China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of Sciences Hefei Anhui 230031 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

Since very few type-I superconductors are known and most are elemental superconductors, there are very few experimental platforms where the interaction between type-I superconductivity and topologically nontrivial band structure can be probed. The rhenium aluminide Al6Re has recently been identified as a type-I superconductor with a transition of 0.74 K and a critical field of ∼50 Oe. Here, we report its magnetotransport behavior including de Haas–van Alphen and Shubnikov–de Haas oscillations. Angular dependence of the magnetoresistance reveals a highly anisotropic Fermi surface with dominant hole character. From the strong oscillatory component ΔRxx in high magnetic fields up to 33 T, the Landau index infinite-field intercept in the case of a single oscillation frequency, and the phase factor φ where multiple frequencies coexist, are both ∼1/4. This intermediate value is suggestive of possible nontrivial band topology but does not allow strong conclusions.

关键词： Fermi surface Magnetoresistance Superconductivity Topological materials Transition metal alloys Type-I superconductors Shubnikov-de Haas effect de Haas-van Alphen effect

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Experimental study of breathers and rogue waves generated by random waves over non-uniform bathymetry

arXiv

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arXiv 2020年

作者： Wang, A. Ludu, A. Zong, Z. Zou, L. Pei, Y. School of Shipbuilding Engineering Dalian University of Technology Dalian Liaoning116024 China Dept. Mathematics & Wave Lab Embry-Riddle Aeronautical University Daytona BeachFL United States Collaborative Centre of Advanced Ships and Deepwater Engineering DUT Dalian Liaoning116024 China Liaoning Deepwater Floating Structure Engineering Technology Lab Dalian Liaoning China School of Naval Architecture Dalian University of Technology Dalian Liaoning116024 China State Key Laboratory of Structural Analysis for Industrial Equipment DUT Dalian Liaoning116024 China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240 China

Experimental results describing random, uni-directional, long crested, water waves over non-uniform bathymetry confirm the formation of stable coherent wave packages traveling with almost uniform group velocity. The waves are generated with JONSWAP spectrum for various steepness, height and constant period. A set of statistical procedures were applied to the experimental data, including the space and time variation of kurtosis, skewness, BFI, Fourier and moving Fourier spectra, and probability distribution of wave heights. Stable wave packages formed out of the random field and traveling over shoals, valleys and slopes were compared with exact solutions of the NLS equation resulting in good matches and demonstrating that these packages are very similar to deep water breathers solutions, surviving over the non-uniform bathymetry. We also present events of formation of rogue waves over those regions where the BFI, kurtosis and skewness coefficients have maximal *** Codes 76B15, 76B25, 76D33, 76E30, 74J30, 74J35 Copyright © 2020, The Authors. All rights reserved.

关键词： Water waves

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Ion-Accumulation-Induced Charge Tunneling for High Gain Factor in P–I–N-Structured Perovskite CH3NH3PbI3X-Ray Detector

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advanced Materials Technologies 2021年第6期7卷

作者： Shanshan Jia Yingrui Xiao Mingxin Hu Xilai He Nuo Bu Nan Li Yucheng Liu Yunxia Zhang Jian Cui Xiaodong Ren Kui Zhao Ming Liu Shubo Wang Ningyi Yuan Jianning Ding Zhou Yang Shengzhong(Frank) Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China School of Microelectronics and State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China School of Materials Science and Engineering Jiangsu Collaborative Innovation Center for Photovoltaic Science and Engineering Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology Changzhou University Changzhou 213164 China Micro/Nano Science and Technology Center Jiangsu University Zhenjiang 212013 China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Lead halide perovskite-based X-ray detectors show very promising sensitivity and low detection limit, which can be used for next-generation, room-temperature radiation detections. It is interesting to find that the diode-structured X-ray detector shows very high photocurrent gain under small reversed bias voltage, which is unusual and should be investigated and understood for better device design. In this regard, a lead halide perovskite-based X-ray detector with the p–i–n structure is fabricated and studied. The p–i–n structured device shows abnormal and excellent photoconductor properties with high photocurrent gain factor under reverse bias. Further device simulation reveals that the ion migration and accumulation in the perovskite material are responsible for the large band-bending at the interface, which may induce charge tunneling to reduce the contact resistance and causes the reverse-biased device to work as a photoconductor rather than a photodiode. This finding provides a new approach to the understanding and design of high-performance X-ray detectors utilizing ionic semiconductors like lead halide perovskites.

关键词： ion migration photoconductive gain X-ray detector

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Crystallization Regulation by Self-Assembling Liquid Crystal Template Enables Efficient and Stable Perovskite Solar Cells

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Angewandte Chemie 2023年第52期135卷

作者： Meizi Wu Hongyan Wang Yong Li Dr. Ran Chen Hui Zhou Shaomin Yang Dongfang Xu Kun Li Prof. Dr. Zhongwei An Shengzhong (Frank) Liu Prof. Dr. Zhike Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology International Joint Research Center of Shaanxi Province for Photoelectric Materials Science School of Materials Science & Engineering Shaanxi Normal University Xi'an 710119 P. R. China Contribution: Data curation (lead) Formal analysis (lead) Investigation (lead) Writing - original draft (lead) Contribution: Data curation (equal) Formal analysis (equal) Contribution: Data curation (equal) Investigation (equal) School of Materials Science and Engineering Xi' an University of Science and Technology Xi'an 710054 P. R. China Contribution: Conceptualization (lead) Methodology (equal) Contribution: Formal analysis (equal) Investigation (equal) Contribution: Methodology (equal) Contribution: Data curation (equal) Contribution: Investigation (equal) Contribution: Conceptualization (equal) Methodology (equal) Contribution: Conceptualization (equal) Methodology (equal) Writing - review & editing (lead)

It is found that the disordered growth of bottom perovskite film deteriorates the buried interface of perovskite solar cells (PSCs), so developing a new material to modify the buried interface for regulating the crystal growth and defect passivation is an effective approach for improving the photovoltaic performance of PSCs. Here, we developed a new ionic liquid crystal (ILC, 1-Dodecyl-3-methylimidazolium tetrafluoroborate) as both crystal regulator and defect passivator to modify the buried interface of PSCs. The high lattice matching between this ILC and perovskite promotes preferential growth of perovskite film along [001] direction, while the oriented ILC with mesomorphic phase has a strong chemical interaction with perovskite to passivate the interface defect, as a result, the modified buried interface exhibits suppressed defects, improved band alignment, reduced nonradiative recombination losses, and enhanced charge extraction. The ILC-modified PSC delivers a power conversion efficiency of 24.92 % and maintains 94 % of the original value after storage in ambient for 3000 h.

关键词： Crystallization Regulation Ionic Liquid Crystals Perovskite Solar Cells Self-Assembling

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Path towards high-efficient kesterite solar cells

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Journal of Energy Chemistry 2018年第4期27卷 1040-1053页

作者： Dongxiao Wang Wangen Zhao Yi Zhang Shengzhong(Frank)Liu Institute of Photoelectronic Thin Film Devices and Technology and Key Laboratory of Photoelectronic Thin Film Devices and Technology Tianjin Nankai UniversityTianjin 300071China Key Laboratory for Applied Surface and Colloid Chemistry National Ministry of EducationShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710062ShaanxiChina Dalian National Laboratory for Clean Energy iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023.LiaonigChina

Kesterite structure semiconductor Cu2ZnSn（S,Se）4 is one of the most promising candidate as a light absorber material to overtake the next generation of thin film solar cells, owing to its low cost, non-toxic, and earth abundant source materials. The Sbockley-Queisser limit of the single junction Cu2ZnSn（S,Se）4 solar cell is over 30%, signifying a large potential of this family of solar cells. In the past years, with the development of synthesis techniques, Cu2ZnSn（S,Se）4 solar cells have attracted considerable atten- tion and the power conversion efficiency of Cu2ZnSn（S,Se）4 solar cell has experienced a rapid progress. Presently, the certified champion efficiency of CZTSSe solar cells has reached to 12.6%, which is far below the efficiency of Cu（ln,Ga）Se2 solar cell. In this review, the developments of Cu2ZnSn（S,Se）4 solar cells in recent years are briefly reviewed. Then the fundamental understanding of Cu2ZnSn（S,Se）4 solar cells is introduced, including materials and device structure, as well as the band alignment of hetero-junction and their impacts on device performance. After that, we mainly review the progress and achievements in the preparation processes, through vacuum and non-vacuum based processes. Finally, we outline the challenges and perspectives of this promising solar cell.

关键词： Kesterite CZTS Thin film solar cells

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Intrinsic mechanism for anisotropic magnetoresistance and experimental confirmation in CoxFe1−x single-crystal films

arXiv

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arXiv 2020年

作者： Zeng, F.L. Ren, Z.Y. Li, Y. Zeng, J.Y. Jia, M.W. Miao, J. Hoffmann, A. Zhang, W. Wu, Y.Z. Yuan, Zhe Department of Physics State Key Laboratory of Surface Physics Fudan University Shanghai200433 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Center for Advanced Quantum Studies Department of Physics Beijing Normal University Beijing100875 China Department of Physics Oakland University RochesterMI48309 United States Materials Science Division Argonne National Laboratory LemontIL60439 United States Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China

Using first-principles transport calculations, we predict that the anisotropic magnetoresistance (AMR) of single-crystal CoxFe1−x alloys is strongly dependent on the current orientation and alloy concentration. An intrinsic mechanism for AMR is found to arise from the band crossing due to magnetization-dependent symmetry protection. These special k-points can be shifted towards or away from the Fermi energy by varying the alloy composition and hence the exchange splitting, thus allowing AMR tunability. The prediction is confirmed by delicate transport measurements, which further reveal a reciprocal relationship of the longitudinal and transverse resistivities along different crystal axes. Copyright © 2020, The Authors. All rights reserved.

关键词： Anisotropy

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