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Broadband third-order optical nonlinearities of layered franckeite towards mid-infrared regime

Chinese physics B 2024年第10期33卷 275-281页

作者： Zhi-Qiang Xu Tian-Tian Zhou Jie Li Dong-Yang Liu Yuan He Ning Li Xiao Liu Li-Li Miao Chu-Jun Zhao Shuang-Chun Wen Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China School of Mechanical and Electrical Engineering Heze UniversityHeze 274015China

The study of nonlinear optical responses in the mid-infrared(mid-IR)regime is essential for advancing ultrafast mid-IR laser ***,nonlinear optical effects under mid-IR excitation are rarely reported due to the lack of suitable nonlinear optical *** natural van derWaals heterostructure franckeite,known for its narrow bandgap and stability in air,shows great potential for developing mid-IR nonlinear optical *** have experimentally demonstrated that layered franckeite exhibits a broadband wavelength-dependent nonlinear optical response in the mid-IR spectral *** nanosheets were prepared using a liquid-phase exfoliation method,and their nonlinear optical response was characterized in the spectral range of 3000 nm to 5000 *** franckeite nanosheets exhibit broadband wavelengthdependent third-order nonlinearities,with nonlinear absorption and refraction coefficients estimated to be about 10^(-7)cm/W and 10^(-11)cm^(2)/W,***,a passively Q-switched fluoride fiber laser operating around a wavelength of 2800 nm was achieved,delivering nanosecond pulses with a signal-to-noise ratio of 43.6 dB,based on the nonlinear response of *** findings indicate that layered franckeite possesses broadband nonlinear optical characteristics in the mid-IR region,potentially enabling new possibilities for mid-IR photonic devices.

关键词： third-order optical nonlinearities franckeite mid-infrared Q-switching

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Competitive assembling strategy to construct carbon nitride homojunctions for boosting photocatalytic performance

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Journal of Materials Science & Technology 2024年第5期172卷 23-32页

作者： Hua-Wei Zhang Yuan-Yuan Li Bo Li Jing-Hui Shi Tao Huang Gui-Fang Huang Anlian Pan Wangyu Hu Wei-Qing Huang School of Physics&Electronic Engineering Zhengzhou University of Light IndustryZhengzhou 450002China Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China College of Materials Science and Engineering Hunan UniversityChangsha 410082China

Both morphology and composition have a great influence on the properties and functions of materials,however,how to rational modulate both of them to achieve their synergistic effects has been a longstanding ***,we demonstrate a competitive assembling strategy for the construction of metal-free graphite carbon nitride(CN)homojunctions in which morphology and composition can be easily controlled simultaneously by only changing the ratio of assembly raw *** homojunctions are comprised of porous nanotubular S-doped CN(SCN)grafted with CN nanovesicles,which are derived from thermal polycondensation of melamine-thiocyanuric acid(M-T)/melamine-cyanuric acid(M-C)supramolecular hybrid *** unique architecture and component engineering endows the novel SCN-CN homojunction with abundant active sites,enhanced visible trapping ability,and intimate interface *** a result,the synthesized SCN-CN homojunctions demonstrate high photocatalytic activity for hydrogen evolution and pollutant *** developed strategy opens up intriguing opportu-nities for the rational construction of intricate metal-free heterostructures with controllable architecture and interfacial contact for applications in energy-related fields.

关键词： Competitive assembling strategy Supramolecular hybrid blocks Homojunctions Graphite carbon nitride Photocatalytic

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Novel two-dimensional PdSe phase:A puckered material with excellent electronic and optical properties

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Frontiers of physics 2022年第5期17卷 65-73页

作者： Mingyun Huang Xingxing Jiang Yueshao Zheng Zhengwei Xu Xiong-Xiong Xue Keqiu Chen Yexin Feng Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics&Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China

By combining structural search and first-principles calculations,we predict a new stable twodimensional PdSe monolayer,and systematically investigate its structural,electronic and optical *** calculated formation enthalpy,phonon spectra and molecular dynamic simulations confirm that PdSe monolayer possesses excellent thermodynamic and dynamic *** monolayer is a semiconductor with an indirect band gap of∼1.10 *** carrier transport of PdSe monolayer is dominated by hole and exhibits remarkable anisotropy due to the intrinsic structure *** optical properties also show obvious anisotropic characteristic with considerable absorption coefficient and broad absorption from the visible to ultraviolet *** from these excellent physical properties,PdSe monolayer is expected to be a promising candidate as electronic and optoelectronic devices.

关键词： first-principles calculation two-dimensional(2D) electronic structure structural search PdSe

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Electron-transporting boron-doped polycyclic aromatic hydrocarbons:Facile synthesis and heteroatom doping positions-modulated optoelectronic properties

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Chinese Chemical Letters 2024年第4期35卷 447-451页

作者： Tingting Huang Zhuanlong Ding Hao Liu Ping-An Chen Longfeng Zhao Yuanyuan Hu Yifan Yao Kun Yang Zebing Zeng Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Shenzhen Research Institute of Hunan University Shenzhen 518000China Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education and Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics Hunan UniversityChangsha 410082China

While heteroatom doping serves as a powerful strategy for devising novel polycyclic aromatic hydrocarbons(PAHs), the further fine-tuning of optoelectronic properties via the precisely altering of doping patterns remains a challenge. Herein, by changing the doping positions of heteroatoms in a diindenopyrene skeleton, we report two isomeric boron, sulfur-embedded PAHs, named Anti-B_(2)S_(2) and Syn-B_(2)S_(2), as electron transporting semiconductors. Detailed structure-property relationship studies revealed that the varied heteroatom positions not only change their physicochemical properties, but also largely affect their solid-state packing modes and Lewis base-triggered photophysical responses. With their low-lying frontier molecular orbital levels, n-type characteristics with electron mobilities up to 1.5 × 10^(-3)cm^(2)V^(-1)s^(-1)were achieved in solution-processed organic field-effect transistors. Our work revealed the critical role of controlling heteroatom doping patterns for designing advanced PAHs.

关键词： Polycyclic aromatic hydrocarbon Optoelectronic properties Heteroatom doping n-Type organic semiconductors Structure–property relationship

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Integer- and fractional-order cylindrical vector beam generation via self-assembled dichroic dye thin films

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Optics Letters 2025年第8期50卷 2687-2690页

作者： Wu, Yan Liu, Mingqiang Liu, Xuefei Xiao, Wenjun Wang, Gang Wang, Degui Gao, Changsong Wang, Zhen Aierken, Abuduwayiti Bi, Jinshun Wen, Shuangchun Huang, Huihui School of Physics and Electronic Science Guizhou Normal University Guiyang Guizhou550025 China School of Integrated Circuit Guizhou Normal University Guiyang550025 China Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics Hunan University Changsha410082 China

Integer- and fractional-order cylindrical vector beams have attracted widespread attention due to their wide range of tunable parameters and unique optical properties. In this paper, we propose a method for multi-order vector polarization control using self-assembled monolayers composed of dichroic dye molecules. The surface energy distribution of the liquid crystal polymer substrate is precisely controlled by dynamic laser direct writing lithography technology, driving the dichroic dye molecules to form a spatially continuous angular gradient micro-nanostructure. The results show that the single control element can realize integer- and fractional-order precise continuous cylindrical vector beam polarization state generation. The polarization modulation characteristics of cylindrical vector beams with different polarization orders were studied to reveal the changes in its polarization states during rotation, providing a method for high-precision optical control and measurement. This single polarization element has advantages in system miniaturization, process compatibility, and functional scalability, which are conducive to the flexible design and development of compact and high-precision optical systems. © 2025 Optica Publishing Group.

关键词： Dichroism

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Heterointerface Engineering-Induced Oxygen Defects for the Manganese Dissolution Inhibition in Aqueous Zinc Ion Batteries

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Energy & Environmental Materials 2024年第3期7卷 112-122页

作者： Wentao Qu Yong Cai Baohui Chen Ming Zhang Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics&Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China Engineering Research Center of Advanced Semiconductor Technology and Application of Ministry of Education&Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education College of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082China Changsha Semiconductor Technology and Application Innovation Research Institute College of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082China State Key Laboratory of Disaster Prevention&Reduction for Power Grid Transmission and Distribution Equipment(Hunan Electric Power Corporation Disaster Prevention and Reduction Center) Changsha 410007China

Manganese-based material is a prospective cathode material for aqueous zinc ion batteries(ZIBs)by virtue of its high theoretical capacity,high operating voltage,and low ***,the manganese dissolution during the electrochemical reaction causes its electrochemical cycling stability to be *** this work,heterointerface engineering-induced oxygen defects are introduced into heterostructure MnO_(2)(δa-MnO_(2))by in situ electrochemical activation to inhibit manganese dissolution for aqueous zinc ion ***,the heterointerface between the disordered amorphous and the crystalline MnO_(2)ofδa-MnO_(2)is decisive for the formation of oxygen *** the experimental results indicate that the manganese dissolution ofδa-MnO_(2)is considerably inhibited during the charge/discharge *** analysis indicates that the oxygen defect regulates the electronic and band structure and the Mn-O bonding state of the electrode material,thereby promoting electron transport kinetics as well as inhibiting Mn ***,the capacity ofδa-MnO_(2)does not degrade after 100 cycles at a current density of 0.5 Ag^(-1)and also 91%capacity retention after 500cycles at 1 Ag^(-1).This study provides a promising insight into the development of high-performance manganese-based cathode materials through a facile and low-cost strategy.

关键词： electrochemical activation heterointerface manganese dissolution inhibition oxygen defects zinc ion batteries

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Design of Flexible Films Based on Kinked Carbon Nanofibers for High Rate and Stable Potassium-Ion Storage

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Nano-Micro Letters 2022年第3期14卷 184-200页

作者： Qiaotian Xiong Hongcheng He Ming Zhang Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low‑Dimensional Structural Physics&Devices School of Physics and ElectronicsCollege of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082People’s Republic of China Semiconductor Technology and Application Innovation Institute of Changsha Changsha 410012People’s Republic of China

With the emergence of wearable electronics,flexible energy storage materials have been extensively studied in recent ***,most studies focus on improving the electrochemical properties,ignoring the flexible mechanism and structure design for flexible electrode materials with high rate capacities and long-time *** this study,porous,kinked,and entangled network structures are designed for highly flexible fiber *** on theoretical analysis and finite element simulation,the bending degree of the porous structure(30%porosity)increased by 192%at the *** appropriate increase in kinking degree at the meso-level and contact points in entanglement network at the macro-level are beneficial for the flexibility of fiber ***,a porous and entangled network of sulfur-/nitrogen-co-doped kinked carbon nanofibers(S/N-KCNFs)is *** nanofiber films synthesized from melamine as nitrogen sources and segmented vulcanization exhibited a porous,kinked,and entangled network structure,and the stretching degree increased several *** flexible S/N-KCNFs anode delivered a higher rate performance of 270 mAh g−1 at a current density of 2000 mA g−1 and a higher capacity retention rate of 93.3%after 2000 ***,the foldable pouch cell assembled by potassium-ion hybrid supercapacitor operated safely at large-angle bending and showed long-time stability of 88%capacity retention after 4000 *** study provides a new idea and strategy for the flexible structure design of high-performance potassium-ion storage materials.

关键词： Flexible design Finite element simulation Sulfur-/nitrogen-Co-doped Anode Potassium-ion storage

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Ultimate dielectric scaling of 2D transistors via van der Waals metal integration

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Nano Research 2022年第2期15卷 1603-1608页

作者： Weiqi Dang Bei Zhao Chang Liu Xiangdong Yang Lingan Kong Zheyi Lu Bo Li Jia Li Hongmei Zhang Wanying Li Shun Shi Ziyue Qin Lei Liao Xidong Duan Yuan Liu Hunan Key Laboratory of Two-Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics College oj Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Hunan Key Laboratory of Two-Dimensional Materials Department of Applied PhysicsSchool of Physics and ElectronicsHunan UniversityChangsha 410082China Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China

The two-dimensional transition metal dichalcogenides(TMDs)have attracted intense interest as an atomically thin semiconductor channel for the continued transistor ***,with a dangling bond free surface,it has been a key challenge to reliably integrate high-quality gate dielectrics on *** particular,the atomic layer deposition of dielectrics on TMDs typically features highly non-uniform nucleation and produces a highly rough or porous dielectric film with rich pinholes that are prone to further damage during the gate integration *** we report a van der Waals(vdW)integration route towards highly reliable gate metal integration on porous *** physical lamination process employed by the vdW integration avoids the direct deposition of metal electrodes into porous dielectrics to ensure reliable gate integration and produce low gate leakage *** electrical measurements demonstrate the vdW integrated MoS_(2) top gate devices exhibit substantially reduced gate leakage current that is about 3-5 orders of magnitude smaller than that with deposited metal ***,we show the vdW integration process can be used to create high performance top-gated MoS_(2) transistors with ultrathin Al_(2)O_(3) dielectrics down to 1 nm,representing the ultimate dielectric scaling for TMDs *** study demonstrates that vdW integration can enable highly reliable gate integration on relatively low quality dielectrics on TMDs,and opens an interesting pathway to high-performance top-gate transistors using dangling bond free two-dimensional(2D)semiconductors.

关键词： van der Waals(vdW)integration dielectric scaling transfer gate MoS_(2) metal oxide semiconductor field effect transistor(MOSFET)

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Selective formation of ultrathin PbSe on Ag(111)

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Chinese physics B 2022年第9期31卷 118-122页

作者： Jing Wang Meysam Bagheri Tagani Li Zhang Yu Xia Qilong Wu Bo Li Qiwei Tian Yuan Tian Long-Jing Yin Lijie Zhang Zhihui Qin Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China Department of Physics University of GuilanP.O.Box 41335-1914RashtIran

Two-dimensional(2D)semiconductors,such as lead selenide(PbSe),locate at the key position of next-generation ***,the ultrathin PbSe is still rarely reported experimentally,particularly on metal ***,we report the ultrathin PbSe synthesized via sequential molecular beam epitaxy on Ag(111).The scanning tunneling microscopy is used to resolve the atomic structure and confirms the selective formation of ultrathin PbSe through the reaction between Ag5Se2 and Pb,as further evidenced by the theoretical *** is also found that the increased accumulation of Pb leads to the improved quality of PbSe with larger and more uniform *** detailed analysis demonstrates the bilayer structure of synthesized PbSe,which could be deemed to achieve the 2D *** differential conductance spectrum reveals a metallic feature of the PbSe film,indicating a certain interaction between PbSe and Ag(111).Moreover,the moirépattern originated from the lattice mismatch between PbSe and Ag(111)is observed,and this moirésystem provides the opportunity for studying physics under periodical modulation and for device *** work illustrates a pathway to selectively synthesize ultrathin PbSe on metal surfaces and suggests a 2D experimental platform to explore PbSe-based opto-electronic and thermoelectric phenomena.

关键词： ultrathin lead selenide(PbSe) scanning tunneling microscopy/spectroscopy(STM/STS) molecular beam epitaxy

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Photonic and phononic interface states based on sunflower-type crystals[Invited]

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Chinese Optics Letters 2023年第6期21卷 61-66页

作者：郭子贤颜贝刘建军 Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China

Interface states are widely applied in waveguide ***,previous studies failed to achieve photonic and phononic interface states independent of each other in the same crystal structure depending on the behavior of the crystal structure,i.e.,photonic or phononic crystals,making the function of interface states *** this study,straight-line and circular photonic and phononic interface states were realized independently in sunflower-type *** addition,with a defect and a metal barrier,interface states could remain almost *** results have the potential to achieve multifunction devices and reduce the cost of engineering applications.

关键词： interface states photonic and phononic crystals sunflower-type crystals

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