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Laser-induced phase segregation of inorganic halide perovskite alloy nanowires for optical switch

Nano Research 2025年第2期18卷 878-886页

作者： Qihang Lv Xia Shen Xuyang Li Jianzhe Liu Zhaohui Shan Liantuan Xiao Pengfei Guo Johnny CHo College of Physics and Optoelectronics Taiyuan University of TechnologyTaiyuan 030024China Huangshan Bright Semiconductor Co. Ltd.Huangshan 245021China Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong 999077China Institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka 819-0395Japan

Inorganic perovskitenanostructures have attracted considerable attention for their tunable band gaps and excellent optoelectronic *** is inevitable that phase segregation of halide perovskite usually occurs in mixed-halide perovskites under a focused laser llumination,which caused by photo-induced halide-ion ***,we reported an uniform perovskite alloy nanowires via a chemical vapor deposition(CvD)*** characterization reveals that these perovskite nanowires have independent linear morphology_with high-quality ***-photoluminescence(PL)spectra exhibit that these nanowire structures show a dual-wavelength emissions at 690 and 570 nm,***,time-dependent PL intensity of the emission peak at 690 nm increased by the decrease of the emission peak at 570 nm under a focused laser llumination,indicating the formation of phase segregation at the excited ***,based on these as-grown halide perovskite CsPbBr2.52lo.48 nanowires,a reasonably optical switch is designed and *** optical switch may have potential applications in timed blasting system and time-delay circuit in the future.

关键词： perovskite alloy nanowires phase segregation dual-wavelength emission optical switch nanophotonics

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Deuteron under strong magnetic fields: Skyrme model study

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Chinese physics C 2023年第3期47卷 146-153页

作者：陈晏军蒋威 Department of Physics and Electronic Science Changsha University of Science and TechnologyChangsha 410114China Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering Changsha 410114China

We explore the deuteron under strong magnetic fields in Skyrme *** effects of the derivative dependent sextic term in the Skyrme Lagrangian are investigated,and the rational map approximation is used to de-scribe the *** influences of strong magnetic fields on the electric charge distribution and mass of the deu-teron arediscussed.

关键词： skyrmion strong magnetic fields deuteron

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Insight into structural degradation of NCMs under extreme fast charging process

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Rare Metals 2024年第1期43卷 41-50页

作者： Yu Tang Xing-Yu Wang Jin-Can Ren Bo-Wen Chen Zhi-Yong Huang Wei Wang Ya-Lan Huang Bing-Hao Zhang Si Lan Zhang-Long He Qi Liu Hao He Department of Physics City University of Hong KongHong Kong 999077China Shenzhen Research Institute City University of Hong KongShenzhen 518057China College of Materials Science and Engineering Changsha University of Science&TechnologyChangsha 410114China

Lithium-ion batteries(LIBs)with extreme fast charging(XFC)capability are considered an effective way to alleviate range anxiety for electric vehicle(EV)*** to the high ionic and electronic conductivity of LiNi_(x)Co_(y)Mn_zO_(2)(x+y+z=1,NCM)cathodes,the inevitable Li plating of graphite in NCM|graphite cell is usually identified as a key bottleneck for XFC ***,the capacity decay mechanism of cathode materials under XFC has not been fully *** this work,three typical NCM cathode materials with different Ni fractions were chosen and their electrochemical performances under XFC associated with structural evolution were investigated.A faster capacity decay of NCMs under XFC conditions is observed,especially for Ni-rich ***-situ X-ray diffraction(XRD)reveals that the multiple caxis parameters appear at the high-voltage regions in Nirich NCMs,which is probably triggered by the larger obstruction of Li(de)***,NCMs with moderate Ni fraction also present a similar trend under XFC *** phenomenon is more detrimental to the structural and morphological stability,resulting in a faster capacity decay than that under low current *** work provides new insight into the degradation mechanism of NCMs under XFC conditions,which can promote the development of NCM cathode materials with XFC capability.

关键词： Lithium-ion batteries Ni fraction Extreme fast charging Structural evolution

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Tunable Single-Photon Emission with Wafer-Scale Plasmonic Array

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Nano Letters 2024年第11期24卷 3395-3403页

作者： Chen, Chun-An Chen, Po-Han Zheng, Yu-Xiang Chen, Chiao-Han Hsu, Mong-Kai Hsu, Kai-Chieh Lai, Ying-Yu Chuu, Chih-Sung Deng, Hui Lee, Yi-Hsien Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan Department of Physics University of Michigan Ann ArborMI48109-2122 United States Department of Physics National Tsing Hua University Hsinchu30013 Taiwan

Bright, scalable, and deterministic single-photon emission (SPE) is essential for quantum optics, nanophotonics, and optical information systems. Recently, SPE from hexagonal boron nitride (h-BN) has attracted intense interest because it is optically active and stable at room temperature. Here, we demonstrate a tunable quantum emitter array in h-BN at room temperature by integrating a wafer-scale plasmonic array. The transient voltage electrophoretic deposition (EPD) reaction is developed to effectively enhance the filling of single-crystal nanometals in the designed patterns without aggregation, which ensures the fabricated array for tunable performances of these single-photon emitters. An enhancement of ∼500% of the SPE intensity of the h-BN emitter array is observed with a radiative quantum efficiency of up to 20% and a saturated count rate of more than 4.5 × 106 counts/s. These results suggest the integrated h-BN-plasmonic array as a promising platform for scalable and controllable SPE photonics at room temperature. © 2024 American Chemical Society

关键词： Single crystals

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Regulating Molecular Structure of S,N-Heteroacene Non-fullerene Acceptors to Achieve Efficient Photoelectric Properties

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Chinese Journal of Chemistry 2025年第1期43卷 13-22页

作者： Mingtao Liu Peipei Zhu Shiting Lai Xiage Zhang Yuang Fu Ling Xue Dan Liu Kui Feng Xinhui Lu Xugang Guo Xunfan Liao Yiwang Chen Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education College of Chemistry and MaterialsJiangxi Normal University99 Ziyang AvenueNanchangJiangxi330022 China Department of Materials Science and Engineering Southern University of Science and Technology(SUSTech)ShenzhenGuangdong518055 China Department of Physics Chinese University of Hong KongNew TerritoriesKowloonHong Kong999077 China

The ternary strategy has demonstrated its efficacy in improving charge transport in organic solar cells(OSCs).Here,three novel non-fullerene acceptors,SN6C9-4F,SN6C9-4Cl and SN6C10-4F,based on S,N-heteroacene linear backbone were designed and *** three acceptors exhibit excellent molecular coplanarity,high crystallinity and possess a deep-lying lowest unoccupied molecular orbital energy level,which is beneficial for charge transport and injection in organic field-effect transistors(OFETs).Notably,the OFET devices based on all three acceptors achieved impressive electron mobilities,with SN6C10-4F achieving up to 0.73 cm^(2)·V^(-1)·s^(-1),which is one of the highest values among A-D-A type small *** addition,the OSCs device based on PBDB-T:SN6C9-4F exhibited the best power conversion efficiency of 12.07%owing to its optimal morphology and enhanced charge ***,the incorporation of SN6C9-4F into the efficient PM6:L8-BO binary system to form ternary OSCs resulted in extended absorption range,enhanced donor crystallization,improved and more balanced charge transport,ultimately leading to an improvement of PCE from 17.78%to 18.32%.This study highlights the potential of developing acceptors with distinct structures from Y-series acceptors to broaden absorption and regulate donor crystallization,providing a novel approach to enhance the PCE of OSCs.

关键词： S,N-Heteroacene Optoelectronic devices High electron mobility Ternary strategy Regulate crystallinity

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Selectivity control of photocatalytic CO_(2) reduction over ZnS-based nanocrystals:A comparison study on the role of ionic cocatalysts

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Journal of Energy Chemistry 2023年第11期86卷 391-398,I0009页

作者： Hong Pang Fumihiko Ichihara Xianguang Meng Lijuan Li Yuqi Xiao Wei Zhou Jinhua Ye Hebei Provincial Laboratory of Inorganic Nonmetallic Materials College of Materials Science and EngineeringNorth China University of Science and TechnologyTangshan 063210HebeiChina International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)Tsukuba 305-0044Japan Center for Green Research on Energy and Environmental Materials(GREEN) National Institute for Materials Science(NIMS)Tsukuba 305-0044Japan Department of Applied Physics School of ScienceTianjin UniversityTianjin 300072China Graduate School of Chemical Sciences and Engineering Hokkaido UniversitySapporo 060-0814Japan

Taking copper doped ZnS(ZnS:Cu)nanocrystals as the main body of photocatalyst,the influence of different base transition metal ions(M^(2+)=Ni^(2+),Co^(2+),Fe^(2+)and Cd^(2+))on photocatalytic CO_(2)reduction in inorganic reaction system is *** single-atom Ni^(2+),Co^(2+),and Cd^(2+)sites were created via cation-exchange process and enhanced CO_(2)reduction,while Fe^(2+)suppressed the photocatalytic activity for both water and CO_(2)*** modified ZnS:Cu photocatalysts(M/ZnS:Cu)demonstrated tunable product selectivity,with Ni^(2+)and Co^(2+)showing high selectivity for syngas production and Cd^(2+)displaying remarkable formate *** calculations indicated favorable H adsorption free energy on Ni^(2+)and Co^(2+)sites,promoting the hydrogen evolution *** selectivity of CO_(2)reduction products was found to be sensitive to the initial intermediate adsorption states.*COOH formed on Ni^(2+)and Co^(2+)while*OCHO formed on Cd^(2+),favoring the production of CO and HCOOH as the main products,*** work provides valuable insights for developing efficient solar-to-fuel platforms with controlled CO_(2)reduction selectivity.

关键词： CO_(2) reduction Photocatalysis Zns Ionic cocatalyst Formate Syngas DFT calculations

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Local probing of the non-uniform distribution of ferrielectric and antiferroelectric phases

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Nano Research 2023年第2期16卷 3021-3027页

作者： Huimin Qiao Fangping Zhuo Zhen Liu Jinxing Wang Jeongdae Seo Chenxi Wang Jinho Kang Bin Yang Yunseok Kim School of Advanced Materials and Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Research Center for Advanced Materials Technology Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany Department of Physics College of ScienceNortheast Forestry UniversityHarbin 150040China Department of Physics Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea School of Instrumentation Science and Engineering Harbin Institute of TechnologyHarbin 150080China

Piezoresponse force microscopy(PFM)is an indispensable tool in the investigation of local electromechanical responses and polarization *** acquired data provide spatial information on the local disparity of polarization switching and electromechanical responses,making this technique advantageous over macroscopic *** its widespread application in ferroelectrics,it has rarely been used to investigate the ferrielectric(FiE)behaviors in antiferroelectric(AFE)***,the PFM was utilized to study the local electromechanical behavior and distribution of FiE,and the AFE phases of PbZrO_(3)thin-film were studied,where only the FiE behavior is observable using a macroscopic *** FiE region resembles a ferroelectric material at low voltages but exhibits a unique on-field amplitude response at high *** contrast,the AFE region only yields an observable response at high ***-field simulations reveal the coexistence of AFE and FiE states as well as the phase-transition processes that underpin our experimental *** work illustrates the usefulness of PFM as an analytical tool to characterize AFE/FiE materials and their phase-coexistence behavior,thereby providing insights to guide property modification and potential applications.

关键词： scanning probe microscopy ferrielectrics antiferroelectrics local electromechanical response

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Improved multiferroic in EuTiO_(3) films by interphase strain engineering

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Chinese Chemical Letters 2023年第7期34卷 379-383页

作者： Yiyan Fan Shiqing Q.Deng Tianyu Li Qinghua Zhang Shuai Xu Hao Li Chuanrui Huo jiaou Wang Lin Gu Kuijuan Jin Oswaldo Dieguez Er-jia Guo Jun Chen Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China School of Mathematics and Physics University of Science and Technology BejingBejing 100083China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Institute of High Energy Physics Chinese Academy of SciencesBejing 100049China Department of Physics University of Chinese Academyof SciencesBeijing100049China Songshan Lake Materials Laboratory Dongguan 523808China National Center for Electron Microscopy in Beijing School of Materials science and EngineeringTsinghua UniversityBeijing 100084China Department of Materials Science and Engineering Faculty of EngineeringTel Aviv UniversityTel Aviv 6997801Israel

Interphase strain engineering provides a unique methodology to significantly modify the lattice structure across a single film,enabling the emergence and manipulation of novel functionalities that are inaccessible in the context of traditional strain engineering *** this work,by using the interphase strain,we achieve a ferromagnetic state with enhanced Curie temperature and a room-temperature polar state in EuO secondary phase-tunned EuTiO_(3) thin films.A combination of atomic-scale electron microscopy and synchrotron X-ray spectroscopy unravels the underlying mechanisms of the ferroelectric and ferromagnetic properties ***,the EuO secondary phase is found to be able to dramatically distort the TiO_6 octahedra,which favors the non-centrosymmetric polar state,weakens antiferromagnetic Eu-Ti-Eu interactions,and enhances ferromagnetic Eu-O-Eu *** work demonstrates the feasibility and effectiveness of interphase strain engineering in simultaneously promoting ferroelectric and ferromagnetic performance,which would provide new thinking on the property regulation of numerous strongly correlated functional materials.

关键词： EuTiO_(3) Magnetic phase transition Polar state Interphase strain engineering

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Broadband nonreciprocal thermal emissivity and absorptivity

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Light(science & Applications) 2024年第9期13卷 1820-1827页

作者： Komron J.Shayegan Jae S.Hwang Bo Zhao Aaswath P.Raman Harry A.Atwater Thomas J.Watson Laboratory of Applied Physics California Institute of TechnologyPasadenaCAUSA Department of Electrical Engineering California Institute of TechnologyPasadenaCAUSA Department of Materials Science and Engineering University of CaliforniaLos AngelesLos AngelesCAUSA Department of Mechanical Engineering University of HoustonHoustonTXUSA

A body that violates Kirchhoff’s law of thermal radiation exhibits an inequality in its spectral directional absorptivity and *** such an inequality is of fundamental interest as well as a prerequisite for achieving thermodynamic limits in photonic energy conversion1 and radiative *** far,inequalities in the spectral directional emissivity and absorptivity have been limited to narrow spectral resonances3,or wavelengths well beyond the infrared *** the gap from basic demonstrations to practical applications requires control over a broad spectral range of the unequal spectral directional absorptivity and *** this work,we demonstrate broadband nonreciprocal thermal emissivity and absorptivity by measuring the thermal emissivity and absorptivity of gradient epsilon-near-zero InAs layers of subwavelength thicknesses(50 nm and 150 nm)with an external magnetic *** effect occurs in a spectral range(12.5–16μm)that overlaps with the infrared transparency window and is observed at moderate(1 T)magnetic fields.

关键词： field. reciprocal thermal

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Midgap states induced by Zeeman field and p-wave superconductor pairing

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Physical Review B 2024年第24期109卷 L241101-L241101页

作者： Yuanjun Jin XingYu Yue Yong Xu Xiang-Long Yu Guoqing Chang Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics Division of Physics and Applied Physics School of Physical and Mathematical Sciences Physics Department and Guangdong-Hong Kong Joint Laboratory of Quantum Matter the Institute of Micro/Nano Materials and Devices Shenzhen Institute for Quantum Science and Engineering International Quantum Academy Shenzhen 518048 China

The one-dimensional Su-Schrieffer-Heeger (SSH) model is central to band topology in condensed matter physics, which allows us to understand and design distinct topological states. In this work we find another mechanism to analogize the SSH model in a spinful system, realizing an obstructed atomic insulator by introducing intrinsic spin-orbit coupling and in-plane Zeeman field. In our model the midgap states originate from a quantized hidden polarization with invariant index Z2 (0; 01) due to the local inversion symmetry breaking. When the global inversion symmetry is broken, a charge pumping is designed by tuning the polarization. Moreover, by introducing the p+ip superconductor pairing potential, a topological phase dubbed obstructed superconductor (OSC) is identified. This new state is characterized by invariant index Z2 (0; 01) and nonchiral midgap states. More interestingly, these nonchiral edge states result in a chiral-like nonlocal conductance, which is different from the traditional chiral topological superconductor. Our findings not only find another strategy to achieve a spinful SSH model but also predict the existence of OSC, providing a promising avenue for further exploration of its transport properties.

关键词： 2-dimensional systems Electronic structure Node-line semimetals Topological insulators Topological materials Topological superconductors

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