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Polarization-Sensitive Enhancement of Photoluminescence and Interlayer Absorption in WSe₂/InSe Heterostructure via Plasmonic Metastructure

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Small 2025年 e2411761页

作者： Zhang, Chao Wu, Kai Wu, Luyan Cao, Guoyang Liu, Xiaoyi Zhang, Cheng Wu, Shaolong Yuan, Xiaoming Zhang, Linglong Li, Xiaofeng Yang, Jiong School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215006 China Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China Soochow University Suzhou 215006 China Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics Central South University Hunan Changsha 410083 China College of Physics Nanjing University of Aeronautics and Astronautics Key Laboratory of Aerospace Information Materials and Physics (NUAA) MIIT Nanjing 211106 China Laboratory of Solid State Microstructures Nanjing University Nanjing 210093 China

2D van der Waals heterostructures (vdWH) serve as ideal platforms for studying interlayer excitons (IX) and developing excitonic devices. Typically, IX exhibit in-plane isotropy and weak oscillator strengths, limiting their application in high-performance and polarization-sensitive optoelectronics. In this work, through the coupling of plasmonic resonances to multilayer WSe₂/InSe vdWH, both anisotropy and enhancement of IX emissions are achieved thanks to the specifically designed metastructure, which couples plasmonic resonance modes with the excitation field in the visible and aligns with the excitonic emission in the near-infrared (NIR). By harnessing the significantly enhanced electromagnetic field generated by the anisotropic plasmonic resonance, a remarkable 52-fold increase is achieved in IX emission intensity, accompanied by an anisotropic ratio of 23%. Furthermore, by utilizing the polarization-sensitive and enhanced interlayer absorption, a NIR WSe₂/InSe photodetector is fabricated on the metastructure, achieving a linear polarization ratio of 5.2 along with an optimal photoresponsivity of 1.85 mA W⁻¹ at 1120 nm, one order of magnitude higher than the pristine WSe₂/InSe photodetector. This work provides a universal approach for introducing anisotropy into IX, while simultaneously enhancing the IX emission and interlayer absorption in 2D vdWH. © 2025 Wiley-VCH GmbH.

关键词： interlayer absorption interlayer exciton metastructure photodetection van der waals heterostructure

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Dynamic control of moirépotential in twisted WS_(2)-WSe_(2)heterostructures

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Nano Research 2022年第8期15卷 7688-7694页

作者： Shaofei Li Haihong Zheng Junnan Ding Biao Wu Jun He Zongwen Liu Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Shenzhen Research Institute of Central South University Shenzhen 518057China

Moirésuperlattices are formed by a lattice mismatch or twist angle in two-dimensional materials,which can generate periodical moirépotentials leading to strong changes in the band structure,resulting in new quantum ***,the experimental engineering of in-situ deformation of moiréheterostructures remains ***,we demonstrate a dynamic local deformation of the twisted heterostructures using a diamond anvil cell(DAC),enabling in-situ dynamic modulation of moirépotential in twisted WS_(2)–WSe_(2)heterostructures at room *** of the twisted heterostructure increases the moirépotential,causing a red shift of the moiréexciton resonance,and observed the red shift of the intralayer exciton resonance up to 16.3 meV(less than 1.1 GPa).The blue shift of the interlayer excitons of twisted WS_(2)–WSe_(2)heterostructures shows an evident transition of the pressure sensitive exciton,induced by the dominant effect of modifying the band structure on optical *** with the spectral changes of pressurized Raman,which further demonstrated that the DAC can efficiently regulate the interlayer *** results offer an effective strategy for in-situ dynamic modulation of moirépotential,providing a promising platform for the development of novel quantum devices.

关键词： moirésuperlattices twisted heterostructures moirépotential diamond anvil cell(DAC)

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Interface modification for organic solar cells

Interface modification for organic solar cells

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Photonics for Energy, PFE 2015

作者： Yang, Junliang Xiong, Jian Yang, Bingchu Gao, Yongli School of Physics and Electronics Central South University Changsha Hunan410083 China Hunan Key Laboratory for Super-microstructure and Ultrafast Process Central South University Changsha Hunan410083 China Department of Physics and Astronomy University of Rochester RochesterNY14627 United States

Annealing-free and stable TiO2 nanocrystalline particles (TiO2 NPs) was synthesized and used as an interface modification layer in both conventional and inverted organic solar cells as well as in perovskite solar cell... 详细信息

ISBN: (纸本)9781943580019

关键词： Organic solar cells

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Evidence for interlayer coupling and moiréexcitons in twisted WS_(2)/WS_(2)homostructure superlattices

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Nano Research 2023年第2期16卷 3429-3434页

作者： Haihong Zheng Biao Wu Shaofei Li Jun He Keqiu Chen Zongwen Liu Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China Department of Applied Physics School of Physics and ElectronicsHunan UniversityChangsha 410082China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Shenzhen Research Institute of Central South University Shenzhen 518000China

The formation of moirésuperlattices in twisted van der Waals(vdW)homostructures provides a versatile platform for designing the electronic band structure of two-dimensional(2D)*** graphene and transition metal dichalcogenides(TMDs)moirésystems,twist angle has been shown to be a key parameter for regulating the moiré***,the effect of the modulation of the twist angle on moirépotential and interlayer coupling has not been the subject of experimental ***,we report the observation of the modulation of moirépotential and intralayer excitons in the WS_(2)/WS_(2)*** accurately adjusting the torsion angle of the homobilayers,the depth of the moirépotential can be *** confinement effect of the moirépotential on the intralayer excitons was further demonstrated by the changing of temperature and valley ***,we show that a detection of atomic reconstructions by the low-frequency Raman mapping to map out inhomogeneities in moirélattices on a large scale,which endows the uniformity of interlayer *** results provide insights for an in-depth understanding of the behaviors of moiréexcitons in the twisted van der Waals homostructure,and promote the study of electrical engineering and topological photonics.

关键词： moirésuperlattices moiréexcitons interlayer coupling moirépotential

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Spin-dependent transport characteristics of nanostructures based on armchair arsenene nanoribbons

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Chinese Physics B 2017年第9期26卷 542-548页

作者：杨开巍李明君张小姣李新梅高永立龙孟秋 Hunan Key laboratory of Super Micro-structure and Ultrafast Process School of Physics and ElectronicsCentral Soulh UniversityChangsha 410083China Physical Science and Technology College of Yichun University Yichun 336000China Department of Physics and Astronomy University of RochesterRochesterNY 14627USA

By employing non-equilibrium Green＇s function combined with the spin-polarized density-functional theory, we investigate the spin-dependent electronic transport properties of armchair arsenene nanoribbons（a As NRs）. Our results show that the spin-metal and spin-semiconductor properties can be observed in a As NRs with different widths. We also find that there is nearly 100% bipolar spin-filtering behavior in the a As NR-based device with antiparallel spin configuration. Moreover, rectifying behavior and giant magnetoresistance are found in the device. The corresponding physical analyses have been given.

关键词： armchair arsenene nanoribbons spin-dependent electronic transport property spin-polarized density-functional theory bipolar spin-filtering behavior

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High performance hole-transport-material-free perovskite solar cells using SnO2 based planer structure

High performance hole-transport-material-free perovskite sol...

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第四届新型太阳能电池学术研讨会

作者： Siyuan Lin Bingchu Yang Jiaqi Yan Xincan Qiu Conghua Zhou Hunan Key Laboratory of Super-microstructure and Ultrafast Process School of Physics and Electronics Central South University

Carbon-based Hole-transport-material-free perovskite solar cells using the special properties(bipolar)of perovskite,not only further reduce the cost of device preparation,but also simplifying the device

关键词： SnO red High performance hole-transport-material-free perovskite solar cells using SnO2 based planer structure

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Composition-controlled synthesis of platinum and palladium nanoalloys as highly active electrocatalysts for methanol oxidation

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Chinese Journal of Catalysis 2018年第2期39卷 342-349页

作者： Haiqiang Zhao Weihong Qi Xinfeng Zhou Haofei Wu Yejun Li School of Materials Science and Engineering Central South University Changsha 410083 Hunan China Key Laboratory of Non‐ferrous Materials Science and Engineering Ministry of Education Central South University Changsha 410083 Hunan China Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha 410083Hunan China

Platinum and palladium(PtPd)alloy nanoparticles(NPs)are excellent catalysts for direct methanol fuel *** this study,we developed PtPd alloy NPs through the co‐reduction of K2PtCl4and Na2PdCl4in a polyol synthesis *** the reaction,the feed molar ratio of the two precursors was carried over to the final products,which have a narrow size distribution with a mean size of *** catalytic activity for methanol oxidation reactions possible depends closely on the composition of as‐prepared PtPd alloy NPs,and the NPs with a Pt atomic percentage of approximately75%result in higher activity and stability with a mass specific activity that is7times greater than that of commercial Pt/C *** results indicate that through composition control,PtPd alloy NPs can improve the effectiveness of catalytic performance.

关键词： Platinum and palladium alloy nanoparticles Composition and size control Methanol oxidation

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Probing Temperature at Nanoscale through Thermal Vibration Characterization using Scanning Precession Electron Diffraction

arXiv

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arXiv 2025年

作者： Yang, Kun Zhang, Chao Wu, Chengwei Du, Qian Li, Bingzhi Fang, Zhen Li, Liang Wu, Jianbo Wu, Tianru Wang, Hui Deng, Tao Gao, Wenpei State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Future Material Innovation Center Zhangjiang Institute for Advanced Study Shanghai Jiao Tong University Shanghai200240 China School of Physics and Electronics Hunan Key Laboratory of Super Microstructure and Ultrafast Process State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Research Center for Scientific Data Hub Zhejiang Lab Hangzhou310000 China SKLPPC Shanghai200240 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China

Accurate, non-contact temperature measurement with high spatial resolution is essential for understanding thermal behavior in integrated nanoscale devices and heterogeneous interfaces. However, existing techniques are often limited by the need for physical contact or insufficient spatial resolution for the measurement of local temperature and mapping its distribution. Here, we showcase the direct temperature measurement of graphene with nanometer spatial resolution in transmission electron microscopy. In experiments, combining a scanning nanobeam with precession electron diffraction offers the collection of kinemetic diffraction from a local area at the nanometer scale. In analysis, we use a pre-calculated, sample-specific structure-factor-based correction method to enable the linear fitting of the diffraction intensities, allowing the determination of the Debye-Waller factor as a function of temperature at the precision of 10-4Å2/C. With the high spatial resolution and measurement precision, the temperature and thermal vibration mapping further reveal the influence of graphene lattice parameters and thickness on the Debye-Waller factor, providing valuable insights into the vibrational properties impacted by temperature, lattice structure, and graphene layer thickness. Copyright © 2025, The Authors. All rights reserved.

关键词： Crystal lattices

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The charge extraction and recombination study in carbon-based hole-conductor-free mesoscopic perovskite solar cells

The charge extraction and recombination study in carbon-base...

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第五届新型太阳能电池学术研讨会

作者：周聪华 Hui Chen Kangming Li Huang Liu Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University

In carbon-baed hole-conductor-free mesoscopic perovskite solar cells(MPSCs),The charge extraction and recombination of the light-induced carriers play a key role in the power conversion efficiency(PCE). Therefore, we systematically study the charge extraction and recombination rate in the different crystallinity devices with varying the loading amount of perovskite. And the results show the larger loading amount leads to better crystallinity and reduce charge recombination rate while inevitably cut down the conductivity and thus influence the charge extraction ***, the effect of the thickness of carbon film on charge extraction is also *** extraction rate is largely enhanced when the thickness is over than 11 μm(30μL), which would guide us to improve the device for the higher PCE.

关键词： Hole-conductor-free Carbon charge extraction and recombination Stability

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The role of 4D flow MRI in deep vein thrombosis research

Meta-Radiology

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Meta-Radiology 2025年第1期3卷

作者： Li, Meizhi Wu, Shangjie Liang, Xiao Gao, Chuanqi Hu, Muhua Chen, Zhu He, Pei Jia, Tingting Xiong, Li Department of Pulmonary and Critical Care Medicine The Second Xiangya Hospital of Central South University Changsha China Department of Medical Administration The Second Xiangya Hospital of Central South University Changsha China Clinical Medical Research Center for Pulmonary and Critical Care Medicine in Hunan Province Changsha China Hunan Research Centre for Evidence-based Medicine The Second Xiangya Hospital of Central South University Changsha China Department of Biomedical Engineering School of Basic Medical Science Central South University Changsha China Department of Radiology Second Xiangya Hospital Central South University Changsha China Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha China National Engineering Research Center for Medical Big Data Application Technology and Big Data Institute Central South University Changsha China General Surgery Department of Second Xiangya Hospital Central South University Changsha China General Surgery Intelligent Healthcare Division of Clinical Medical Research Center of Hunan Province Changsha China

Four-dimensional (4D) flow Magnetic Resonance Imaging (MRI) technology has emerged as a valuable tool in angiography, offering unique insights into the hemodynamics and flow patterns. This research aims to explore the role of 4D flow MRI in advancing our understanding of Deep Vein Thrombosis (DVT), covering its applications in diagnosing, characterizing and mechanism of DVT, as well as its potential for guiding treatment strategies. The qualitative and quantitative information provided by 4D flow MRI enables a comprehensive assessment of blood flow in different vascular regions, shedding light on the relationship between hemodynamic changes and the onset and progression of vascular diseases. Nevertheless, most quantitative research findings for 4D hemodynamic indicators are lacking, and their use is mainly limited to examining arterial conditions. More exploration will be necessary to determine their applicability in studying venous vessels. © 2025 The Authors

关键词： 4D flow MRI Deep vein thrombosis Image analysis algorithms Noninvasive imaging

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