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2023 International Conference on optoelectronic Information and Functional Materials, OIFM 2023

作者： Chen, Houjie Wei, Zhenhua Deng, Chuyun Luo, Wei Qin, Shiqiao Peng, Gang College of Science National University of Defense Technology Changsha410073 China Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices National University of Defense Technology Changsha410073 China College of Advanced Interdisciplinary Studies National University of Defense Technology Changsha410073 China

ISBN: (纸本)9781510668119

Molybdenum ditelluride (2H-MoTe2) has attracted extension research interest for its unconventional features and devices application potentials. Field effect transistors (FETs) based on 2H -MoTe2 usually exhibit ambipolar electric properties, however, integrating both n-type and p-type FETs is of great significance for the device applications. Here, we found that the electric properties of the MoTe2 FETs could be reversible tuned with gas molecules adsorption and magnesium (Mg) doping. After the gas molecules adsorption, the MoTe2 FET is p-type doped and shows hole dominant conduction performance. In the vacuum, the p-type performance of the MoTe2 FET is effectively weakened after the gas molecules desorption. The similar phenomenon happens at the magnesium (Mg) evaporated on the MoTe2 FETs. After the Mg atoms surface covering, the MoTe2 FET is n-type doped and shows electron dominant conduction performance. In the air, the p-type performance of MoTe2 FET is recovered after the Mg oxidation. These results display an effectively method for reversible controlling the MoTe2 FETs. © 2023 SPIE.

关键词： Field effect transistors

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Fabrication and electron transport characteristics of suspended Graphene/hBN heterostructure devices

Fabrication and electron transport characteristics of suspen...

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2022 International Conference on Applied Mechanics and Advanced Materials, ICAMAM 2022

作者： Cui, Ziru Bai, Zongqi Luo, Fang Zhu, Mengjian College Of Advanced Interdisciplinary Studies Hunan Provincial Key Laboratory Of Novel Nano-Optoelectronic Information Materials And Devices National University Of Defense Technology Hunan Changsha410073 China

Graphene has outstanding electrical properties such as high carrier mobility and large operation current density due to it's unique two-dimensional carbon honeycomb lattice structure. However, the carrier mobility and on/off ratio in current of traditional silicon-integrated graphene devices are largely limited due to the substrate-induced scattering effect. Exploring new device structure to prepare graphene devices is an important way to improve their performance. In this work, we propose a new fabricate technique for suspended Graphene/hBN van der Waals heterostructure device with high vield. Combined with improved transfer technology, it greatly improves the probability of successful suspending graphene devices, and we found that the Dirac point of the suspended graphene device is located in nearly zero gate voltage, which reduced the doping in graphene effectively, and further proved the advantages of our device structure in fabricating suspended devices. © Published under licence by IOP Publishing Ltd.

关键词： Graphene

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Flexible Organic Electrochromic devices Having Multicolored,Low-Voltage-Driven and High Contrast,and Organic Photovoltaic Properties Based on Oligomers and Viologen Derivatives

Flexible Organic Electrochromic Devices Having Multicolored,...

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第八届粤港澳真空科技创新发展论坛暨2024年广东省真空学会学术年会

作者：刘平 Jiang Chuanyu Hu jianhua La Ming Huang jiale Xia yaqin Zeng jinming Zhang xuejian Ye weijie Zhumimi Zhong xiaoting Guo xu Qian cha Wang peng Key Laboratory of Luminescent Materials and Devices Research Institute of Materials ScienceSouth China University of Technology Zhuhai Kaivo Optoelectronic Technology Co. Ltd

A series of organic conjugated oligomers and viologen derivatives are synthesized,their photovoltaic(OPV),electrochromic(OEC) properties and corresponding flexible electrochromic devices(FOECD) were investigated..The research results of OPV showed that the hydrogen bond interaction between electron donor and electron acceptor,and photovoltaic materials with liquid crystal and crystal properties,can improve the photoelectric conversion efficiency(PCE) of organic photovoltaic *** research results of OEC showed that these oligomers and viologen derivatives exhibit reversible color changes upon electrochemical doping and *** FOECD has high optical contrast is 75.2% at 700 ***,FOECD driven by solar cells demonstrated good stability.

关键词： Oligomer viologen derivatives Liquid crystal crystal vacuum-evaporated thin film molecular orientation organic photovoltaic device organic photovoltaic performance flexible electrochromic device electrochromic performance optical contrast

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Regulation of photophysical and electronic properties of I-III-VI quantum dots for light-emitting diodes

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Science China Materials 2024年第9期67卷 2737-2748页

作者： Xiaofei Dong Xianggao Li Shougen Yin Zheng Li Longwu Li Jingling Li School of Science Langfang Normal UniversityLangfang 065000China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Institute of Material Physics Key Laboratory for Optoelectronic Materials and Devices of TianjinKey Laboratory of Display Materials and Photoelectric Devices of Ministry of EducationTianjin University of TechnologyTianjin 300384China College of Chemistry and Materials Science Langfang Normal UniversityLangfang 065000China School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528000China

Quantum dot light-emitting diodes(QLEDs)have become an important research direction in the pursuit of next-generation display technology owing to their favorable attributes,including high energy efficiency,wide color gamut,and low *** in the luminous efficiency and operating life of QLEDs have been achieved by enhancing the photoluminescence efficiency of the quantum dots(QDs)and optimizing the device ***,the current mainstream QDs contain heavy metal elements such as lead and cadmium,which restrict the development and application of QD *** new types of environmentally friendly QDs is crucial.I-III-VI semiconductor QDs have been developed as luminescent materials for constructing high color rendering index QLEDs,owing to the outstanding photophysical properties of these QDs,such as composition-dependent tunable bandgap,large Stokes shift,and highefficiency ***,the microstructures of heterojunctions,especially the surface states and interface states,affect the recombination and transport of carriers in electroluminescent(EL)devices with multilayer thin film structures,which in turn influence the luminous efficiency and stability of the *** review focuses on the synthesis strategies of I-III-VI multi-component QDs and provides an in-depth understanding of the luminescence mechanism and the regulation of photophysical and electronic ***,the application of I-III-VI QDs in multi-color and white EL QLEDs is discussed and the challenges and outlook are addressed.

关键词： Ⅰ-Ⅲ-Ⅵquantum dots synthesis method defect states luminescence mechanism light-emitting diodes

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Unveiling the multiband metallic nature of the normal state in the nickelate La3Ni2O7

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Physical Review B 2025年第5期111卷 054519-054519页

作者： Bowen Chen Hengyuan Zhang Jingyuan Li Deyuan Hu Mengwu Huo Shuyang Wang Chuanying Xi Zhaosheng Wang Hualei Sun Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices School of Physics Sun Yat-Sen University Guangzhou 510275 China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University Guangzhou Guangdong 510275 China Anhui Key Laboratory of Low-Energy Quantum Materials and Devices High Magnetic Field Laboratory HFIPS Chinese Academy of Sciences Hefei Anhui 230031 China

The discovery of unconventional superconductivity around 80 K in perovskite nickelates under high pressure has furnished a new platform to explore high-temperature unconventional superconductivity in addition to cuprates. Understanding the normal state of nickelate superconductors is crucial to uncovering the origin of this unconventional superconductivity and gaining further insight into its underlying mechanism. In this paper, we systemically study the transport properties of La3Ni2O7 by tuning the pressure under high magnetic fields. Magnetoresistance (MR) consistently exhibits a quasiquadratic dependence on the magnetic field across all measured pressures and temperatures. Increased pressure enhances the metallicity of the system and leads to a monotonic increase in MR, which follows the extended Kohler's rule. These results suggest the normal state of La3Ni2O7 to be of a multiband metallic nature.

关键词： Perovskite

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Fluorescent light enhanced graphitic carbon nitride/ceria with ultralow-content platinum catalyst for oxidative decomposition of formaldehyde at ambient temperature

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Rare Metals 2021年第11期40卷 3135-3146页

作者： Gang Huang Zhi-Hua Xu Ting-Ting Luo Zhao-Xiong Yan Meng Zhang Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education Jianghan UniversityWuhan 430056China Materials Analysis Center Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Industrial Fume and Dust Pollution Control Jianghan UniversityWuhan 430056China

The complete decomposition of formaldehyde(HCHO) at ambient temperature is the most potential strategy for HCHO elimination from indoor ***,extra low content of Pt nanoparticles(0.025 wt%)supported on water-solubility carbon nitride/ceria(Pt/gC_(3)N_(4)@CeO_(2)) was prepared for gaseous HCHO removal at ambient temperature in a simulated indoor *** light(8 W) illumination could visibly boost the complete decomposition of HCHO into CO_(2) over Pt/gC_(3)N_(4)@CeO_(2).The cooperative effect in the distinct heterostructure and plenty of surface reactive oxygen species contribute primarily to the enhanced catalytic performance of Pt/g-C_(3)N_(4)@CeO_(2).Moreover,the possible mechanism of HCHO oxidation over Pt/g-C_(3)N_(4)@CeO_(2) assisted by the fluorescent light irradiation was proposed based on the physicochemical and optical characterization as well as the result of in situ diffuse reflectance infrared Fourier transform *** work might shed some light on the potential application of the versatile catalysts for ambient-temperature catalytic decomposition of HCHO by making full use of the indoor energies.

关键词： Graphitic carbon nitride(g-C3N4) CeO_(2) Catalytic oxidation Formaldehyde decomposition Ambient temperature Fluorescent light irradiation

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Single-shot terahertz polarization detection based on terahertz time-domain spectroscopy

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Photonics Research 2022年第6期10卷 1374-1379页

作者： QINGGANG LIN XINMING YUAN XUANKE ZENG YATAO YANG YI CAI XIAOWEI LU MAIJIE ZHENG CONGYING WANG WENHUA CAO SHIXIANG XU Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China

This paper presents a novel design for single-shot terahertz polarization detection based on terahertz time-domain spectroscopy(THz-TDS).Its validity has been confirmed by comparing its detection results with those of the THz common-path spectral interferometer through two separate measurements for the orthogonal *** results also show that its detection signal-to-noise ratios(SNRs)are obviously superior to those of the 45°optical bias THz-TDS by electro-optical sampling due to its operation on common-path spectral interference rather than the polarization-sensitive intensity *** setup works without need of any optical scan,which does not only save time,but also efficiently avoids the disturbances from the fluctuations of the system and *** single-shot mode allows it to work well for the applications with poor or no repeatability.

关键词： polarization interferometer optical

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Low IR Drop 480×540RGB Mini-LED Display Based on High Mobility Ln-IZO TFT

Low IR Drop 480×540RGB Mini-LED Display Based on High Mobil...

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International Conference on Display technology, ICDT 2022

作者： Zhou, Lei Xu, Miao Guangzhou New Vision Optoelectronic Co. Ltd. Guangzhou China State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou China

In this paper, we presented a glass Mini-LED display based on high mobility Ln-IZO thin film transistor (TFT) panel. The single Mini-LED display panel has a 240×180RGB pixel array with a pixel pitch of 0.6mm. A new power line structure is adopted to minimize the IR drop of power line to achieve a uniform display. In this Mini-LED display panel, a high mobility Ln-IZO TFT is used, which helps to reduce the power of Mini-LED panel. Both gate IC, source IC and fanout lines are placed at the top of the display, and a three-sided borderless Mini-LED display can be realized after border laser cutting. Then 480×540RGB spliced display is achieved by 2×3 three-sided borderless single panel. At last, a new PWM driving method is introduced, which can simplify drive scheme and achieve a better display image. © 2022, John Wiley and Sons Inc. All rights reserved.

关键词： Thin film transistors

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An improved method for controllable growth of monolayer WSe2and its optical characterization 6

An improved method for controllable growth of monolayer WSe2...

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2022 6th International Conference on Green Composite Materials and Nanotechnology, GCMN 2022

作者： Zhang, Wenhao Yang, Xi Zhu, Zhihong College of Advanced Interdisciplinary Studies Hunan Provincial Key Laboratory of Novel Nano Optoelectronic Information Materials and Devices National University of Defense Technology Hunan Changsha410073 China

Due to the van der Waals interaction between the transition metal sulfide layers, it can be stripped into a single atomic layer, and tungsten diselenides(WSe2) as one of the typical p-type semiconductors has become a research hotspot. WSe2 thin flakes have been successfully prepared by chemical vapor deposition(CVD) methods, but the synthesis conditions of WSe2 are usually highly sensitive and difficult to control, which makes it difficult to grow monolayer WSe2 with good lattice quality in a large area. Here, we use a new CVD growth method to improve the product quality, through the combination of reverse gas flow and rapid heating method to improve the nucleation and lattice quality of *** work will systematically study the effects of key growth conditions, focus on elucidating the growth mechanism, and optimize the growth parameters. In order to verify the preparation of monolayer and multi-layer WSe2 thin flakes with good lattice quality. WSe2 thin flakes were characterized by optical microscope, atomic force microscope, Raman spectrum and photoluminescence (PL) spectrum. Moreover, monolayer WSe2 and multi-layer WSe2 can be distinguished by Raman test and fluorescence spectrum test, and they have different characteristic peaks. We can judge whether the material is monolayer by observing the peak position. © Published under licence by IOP Publishing Ltd.

关键词： Tungsten compounds

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Multidisciplinary and multiscale nanoscience research roadmap based on large scientific facilities

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Science China Chemistry 2024年第8期67卷 2497-2523页

作者： Yuan Zeng Shuhan Zhang Yuecong Guo Yalin Cong Xu Ding Peihua Li Yunxiang Lin Wenzhi Ren Hui Su Weigang Sun Liuxin Xu Guikai Zhang Shihua Chen Yu Chen Weiren Cheng Shengqi Chu Yong Guan Jinru Han Jie Lin Hengjie Liu Zheyi Liu Pan Luo Fanchun Meng Sicong Qiao Zongyin Song Ying Wang Zhao Wu Chenyu Yang Meng Yang Shirui Yang Zi Yin Zhibin Yin Pengjun Zhang Hongyu Zhang Pingping Zheng Jia Zhou Wanlin Zhou Pengfei An He Cheng Chunhai Fan Xingjiu Huang Yong Lei Lina Li Mu Li Qinghua Liu Shuming Peng Li Song Zhihu Sun Yangchao Tian Fangjun Wang Lihua Wang Liming Wang Shiqiang Wei Aiguo Wu Chunlei Xiao Xueming Yang Panchao Yin Jing Zhang Mingxin Zhang Yaling Wang Chunying Chen CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety New Cornerstone Science LaboratoryNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Institute of Solid State Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China Ningbo Key Laboratory of Biomedical Imaging Probe Materials and Technology Zhejiang International Cooperation Base of Biomedical Materials Technology and ApplicationCAS Key Laboratory of Magnetic Materials and DevicesNingbo Cixi Institute of Biomedical EngineeringZhejiang Engineering Research Center for Biomedical MaterialsNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516000China College of Chemistry and Chemical Engineering Hunan Normal UniversityChangsha 410081China State Key Laboratory of Luminescent Materials and Devices South China Advanced Institute for Soft Matter Science and TechnologySouth China University of TechnologyGuangzhou 510640China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Separation Sciences for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Institute of Advanced Science Facilities Shenzhen 518107China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Acade

With the advancement of modern science and technology, large scientific facilities are increasingly oriented toward demand and application, and can be used for basic research as well as serving multiple disciplines. Developing large scientific facilities and related analytical technologies enhances understanding of large scientific facilities and popularizes their application in research across multiple disciplines. The combination of light or neutron sources from large scientific facilities and advanced analytical technologies can be achieved for materials structure information, dynamics study of chemical reactions, high dissociation of biomolecules, 3D visualization of energy materials or biological samples, etc. We first introduce the progress of domestic large scientific facilities of synchrotron radiation(SR) and free electron lasers(FELs) with different wavelengths and neutron *** further discuss the comparison between Chinese and typical foreign facilities in X-ray radiation from X-ray tubes, synchrotrons, X-ray FELs, and neutron sources based on physical parameters of light and neutron sources. In addition, we focus on the technological progress and perspectives combined with advanced X-ray radiation and neutron sources of large scientific facilities in China, especially in the nanoscience fields of energy catalysis and biological science. We hope that this roadmap will provide references on technology and methods to experimental users, as well as prospects for future development of technologies based on large research infrastructure facilities. Comprehensive studies and guidelines for basic research to practical application in various disciplines can be made with the assistance of large scientific facilities.

关键词： large scientific facilities synchrotron radiation FEL light sources neutron sources spectroscopic analysis methods X-ray imaging techniques structural information chemical dynamics

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