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Einstein-de Haas effect:a bridge linking mechanics,magnetism,and topology

Science Bulletin 2025年第3期70卷 301-304页

作者： Xin Nie Dao-Xin Yao Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and TechnologiesCenter for Neutron Science and TechnologySchool of PhysicsSun Yat-sen UniversityGuangzhou 510275China

The Einstein-de Haas(EdH)effect,which establishes that changes in magnetization induce mechanical rotation,was experimentally demonstrated in 1915[1],independently of Richardson’s[2]earlier conceptual prediction rela... 详细信息

关键词： effect linking topology

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A hybrid ambipolar synaptic transistor emulating multiplexed neurotransmission for motivation control and experience-dependent learning

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Chinese Chemical Letters 2023年第2期34卷 557-562页

作者： Zhipeng Xu Yao Ni Hong Han Huanhuan Wei Lu Liu Shuo Zhang Hao Huang Wentao Xu Institute of Optoelectronic Thin Film Devices and Technology Key Laboratory of Optoelectronic Thin Film Devices and Technology of TianjinCollege of Electrical Information and Optical EngineeringNational Institute for Advanced MaterialsNankai UniversityTianjin 300350China

Artificial synapses with full synapse-like functionalities are of crucial importance for the implementation of neuromorphic computing and bioinspired intelligent systems. In particular, the development of artificial synapses with the capability to emulate multiplexed neural transmission is highly desirable, but remains challenging. In this work, we proposed a hybrid ambipolar synaptic transistor that combines two-dimensional(2D) molybdenum disulfide(Mo S_(2)) sheet and crystalline one-dimensional(1D) poly(3-hexylthiophene-2,5-diyl) polymer nanowires(P3HT NWs) as dual excitatory channels. Essential synaptic functions, including excitatory postsynaptic current, paired-pulse facilitation, synaptic potentiation and depression, and dynamic filtering were emulated using the synaptic transistor. Benefitting from the dual excitatory channels of the synaptic transistor, the device achieved a fast switch between short-term and long-term memory by altering the charge carriers in the dual channels, i.e., electrons and holes. This emulated the multiplexed neural transmission of different excitatory neurotransmitters, e.g., dopamine and noradrenaline. The plasticity-switchable artificial synapse(PSAS) simulates the task-learning process of individuals under different motivations and the impact of success or failure on task learning and memory, which promises the potential to enable complex functionalities in future neuromorphic intelligent electronics.

关键词： Hybrid ambipolar Artificial synapse Dual excitatory channels Fast-switching plasticity Task-learning process

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A Multimodal Approach for Prediction of Plastic Color Formulation with Transformers and Convolutional Networks 24

A Multimodal Approach for Prediction of Plastic Color Formul...

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13th International Conference on Computing and Pattern Recognition, ICCPR 2024

作者： Geng, Lei Sun, Huiyu Wang, Wen Xiao, Zhitao Zhang, Fang Liu, Yanbei School of Life Sciences Tianjin Key Laboratory of Optoelectronic Detection Technology and System Tiangong University Tianjin China

ISBN: (纸本)9798400717482

Color formulation prediction aims to get different target colors based on a specified color range. It was difficult for existing color matching methods to achieve accurate nonlinear mapping from target colors to formulations due to the overlook of the global and local features of color information. Global featuress represent the long-range variation trends of the input information, while local features represent the numerical characteristics of the input data. To address this issue, a novel feature extraction block based on Transformer and parallel convolutional neural network was proposed for the first time. By integrating this block with a color feature extractor after the fusion of color features, a multimodal color feature fusion network framework was constructed to comprehensively learn the nonlinear mapping between multi-modal inputs and formulations, formulation reflectance curves. This network framework achieved a total loss of 0.0421 and a formulation loss of 0.0391 on test set, indicating more accurate color formula predictions. © 2024 Copyright held by the owner/author(s).

关键词： Convolutional neural networks

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A Novel Synthesis Method of a Sparse Rectangular Planar Receiving Array for Microwave Power Transmission

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Progress In Electromagnetics Research C 2023年 134卷 11-25页

作者： Li, Jianxiong Liu, Shuo School of Electronics and Information Engineering Tiangong University Tianjin China Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems Tianjin China

A novel synthesis method of a sparse rectangular planar receiving array (SRPRA) to maximize the power transmission efficiency (PTE) for microwave power transmission (MPT) is proposed in this paper. The array element positions of the SRPRA are symmetrically distributed among different quadrants such that the array elements at symmetrical positions receive the same power, and the SRPRA adopts a sparse layout. This reduces the number of array elements and simplifies the complexity of the feeding network. An improved adaptive chaotic particle swarm optimization (IACPSO) algorithm is proposed for the optimization synthesis problem of the SRPRA. Through the optimization of the proposed IACPSO algorithm, the optimal element layout of the SRPRA can be obtained efficiently to get the maximum PTE. In addition, we conduct a series of simulation experiments to verify the advantages of the proposed SRPRA model and the effectiveness of the IACPSO algorithm. Firstly, we analyze the effects of different parameters on the synthesis results of the SRPRA. Secondly, comparing the results with those of the sparse random circular aperture array (SRCAA), it is demonstrated that the SRPRA synthesized with the IACPSO algorithm can obtain higher PTE with fewer elements and has a relatively simple feeding network. Finally, compared with the standard particle swarm optimization (SPSO) algorithm, the proposed IACPSO algorithm can effectively and stably obtain the synthesis results of the SRPRA under different parameters. Therefore, the SRPRA is suitable for creating an efficient MPT system. © 2023, Electromagnetics Academy. All rights reserved.

关键词： Particle swarm optimization (PSO)

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A Novel Receiving Subarray Partition Layout Model for Microwave Power Transmission with Smaller Power Dispersion

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Progress In Electromagnetics Research C 2023年 131卷 241-257页

作者： Li, Jianxiong Qin, Wen School of Electronics and Information Engineering Tiangong University Tianjin China Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems Tianjin China

—A novel subarray layout method is proposed for the problems of high power dispersion and high complexity of the existing layout methods of receiving rectifier antenna arrays. By the traditional RF synthesis and DC synthesis array layout, the number of units used is high, and the received power dispersion is high. Therefore, this paper proposes a uniform non-overlapping triangular subarray partition layout, and the layout takes three discrete parameters of subarray type, subarray position, subarray placement direction as optimization variables. The minimum dispersion of the received power of the subarray is used as the optimization objective to establish the optimization model. We adopt the Taboo Search (TS) algorithm to achieve the global optimum by setting up a taboo table for global neighborhood search and homogenize the received microwave power value from each subarray. The result shows a lower coefficient of variation (CV ) with fewer subarrays and a globally symmetric subarray layout, which reduces the engineering complexity and cost of the subsequent rectification circuit, as well as a lower dimensional span between different subarray types in this novel subarray layout model. We conducted a series of numerical simulations to prove that the method can meet the requirement of minimum power dispersion while ensuring that the total reception efficiency will not be greatly reduced, which verifies the effectiveness of this receiving subarray layout method. © 2023, Electromagnetics Academy. All rights reserved.

关键词： Electric power transmission

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Potassium doping for grain boundary passivation and defect suppression enables highly-efficient kesterite solar cells

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Chinese Chemical Letters 2024年第11期35卷 565-570页

作者： Yingfen Li Zhiqi Wang Yunhai Zhao Dajun Luo Xueliang Zhang Jun Zhao Zhenghua Su Shuo Chen Guangxing Liang College of Materials and Energy Engineering Guizhou Institute of TechnologyGuiyang 550003China Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

The complicated and diverse deep defects,voids,and grain boundary in the CZTSSe absorber are the main reasons for carrier recombination and efficiency *** further improvement of the open-circuit voltage and fill factor so as to increase the efficiency of CZTSSe device is *** this work,we obtained K-doped CZTSSe absorber by a simple solution *** medium-sized K atoms,which combine the advantages of light and heavy alkali metals,are able to enter the grain interior as well as segregate at grain *** K-Se liquid phase can improve the absorber *** find that the accumulation of the wide bandgap compound K_(2)Sn_(2)S_(5)at grain boundary can increase the contact potential difference of grain boundary,form more effective hole barriers,and enhance the charge separation *** the same time,K doping passivates the interface as well as bulk defects and suppresses the non-radiative *** improved crystallinity,enhanced charge transport capability and reduced defect density due to K doping result in a significant enhancement of the carrier lifetime,leading to 13.04%device *** study provides a new idea for simultaneous realization of grain boundary passivation and defect suppression in inorganic kesterite solar cells.

关键词： Kesterite Solar cell Chemical doping Defect Efficiency

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Utilizing morpholine for purely organic room temperature phosphors

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Science China Chemistry 2023年第4期66卷 1132-1138页

作者： Dongyan Jiang Tong Lu Chunya Du Futong Liu Zhenyu Yan Dehua Hu Anqi Shang Lei Gao Ping Lu Yuguang Ma State Key Laboratory of Supramolecular Structure and Materials Department of ChemistryJilin UniversityChangchun 130012China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

In this article,morpholine,a non-conjugated heterocycle,is embedded intoπsystem to construct single-component organic room temperature phosphorescence(RTP)*** effect of morpholine on intermolecular interaction,crystal packing modes,and RTP performance is investigated *** experimental and theoretical calculation results illustrate the versatility of morpholine in promoting the n-π*transition and intensifying the intermolecular interactions,which not only enhances the generation of triplet excitons,but also suppresses the nonradiative decay of triplet ***,TMPh containing three morpholine units shows an ultralong lifetime of 1.03 s and a visible afterglow up to 10 *** unique dual delayed emission and long afterglow property allow potential application of morpholine derivatives in data encryption,and the time-dependent color change of afterglow emission is realized after removing the excitation source,providing a high-level data *** article provides a new perspective for the design of purely organic RTP system without utilization of metal,or even any heavy atoms.

关键词： morpholine room temperature phosphorescence aggregation noncovalent interactions thermally activated delayed fluorescence

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A Li_(3)Bi/LiF interfacial layer enabling highly stable lithium metal anode

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Rare Metals 2023年第12期42卷 4081-4090页

作者： Lei Tan Peng Chen Qiao-Yun Chen Xing Huang Kang-Yu Zou Yan-Mei Nie Ling-Jun Li Changsha University of Science and Technology Changsha 410114China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Lithium metal anode is considered the alternative to graphite anode due to its ultra-high theoretical capacity of 3860 mAh·g^(-1).However,serious Li dendrite growth and drastic electrolyte side reactions restrain the commercial application of Li metal *** this work,a Li_(3)Bi/LiF interfacial layer is constructed on the surface of the Li metal anode by a spontaneous substitution *** composite interfacial layer possesses excellent ionic conductivity,high mechanical strength,and great electrolyte wettability,which ensures fast Li-ion transfer and uniform Li deposition of the Li_(3)Bi/LiF@Li ***,the Li_3Bi/LiF@Li symmetric cell provides a cycle life of more than 400 h with only 73 mV voltage polarization at 10 mA·cm^(-2).By pairing with commercial NCM622 cathode,the Li_(3)Bi/LiF@Li full cell exhibits a long cycle at a rate of 2 C.

关键词： Lithium metal anode Li_(3)Bi LiF interfacial layer Dendrite-free High current density

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Guest-assisted assembly strategy:boosting solvent-processed organic solar cells toward commercialization

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Science China Chemistry 2022年第4期65卷 645-646页

作者： Yong Cao State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesInstitute of Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

In recent years, due to the increasing demand for green energy, organic/polymer heterojunction solar cells have aroused great interest in the academic and industrial ***/polymer solar cells (OSCs) have a series of advantages over their counterparts. The morphology of the active layer and the energy band structure of the device can be adjusted easily by changing the molecular ***-area low-cost modules can be prepared by roll-to-roll solution printing at room temperature.

关键词： temperature structure polymer

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High glass transition temperature dopant-free hole transport material via D-A-π-A-D-strategy for perovskite solar cell

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Rare Metals 2024年第12期43卷 6373-6383页

作者： Cheng-Hui Liao Li-Gang Yuan Yi-Heng Zhang Wei-Ya Zhu Min-Chao Qin Zhi-Bo He Jie-Lin Huang Hao-Lin Xiao Zhi-Heng Li Xin-Hui Lu Ke-You Yan Yuan Li State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSchool of Materials Science and EngineeringSouth China University of TechnologyGuangzhou510640China School of Environment and Energy State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Solid Wastes Pollution Control and RecyclingSouth China University of TechnologyGuangzhou510000China Department of Physics The Chinese University of Hong KongHong Kong999077China

Despite the great leap forward perovskite solar cells(PSCs)have achieved in power conversion efficiency,the device instability remains one of the major problems plaguing its ***-free hole transport material(HTM)has been widely studied as an important strategy to improve the stability of PSCs due to its avoidance of moisture-sensitive dopants and cumbersome doping *** this work,a series of dopant-free HTMs L1F,L2F and L3F based on D-A-π-A-D configuration were synthesized through two steps of reaction.L3F presents a high glass transition temperature of 1800C and thermal decomposition temperature of ***,electron paramagnetic resonance signals of L1F,L2F and L3F powders indicate the open-shell quinoidal diradical resonance structure in their aggregation state due to aggregation-induced radical *** these HTMs present higher hole mobility than dopant-free Spiro-OMeTAD,and the dopant-free L3F-based PSC device achieves the highest power conversion efficiency of 17.6%among *** addition,due to the high hydrophobic properties of L1F,L2F and L3F,the perovskite films spin-coated with these HTMs exhibit higher humidity stability than doped *** results demonstrate a promising design strategy for high glass transition temperature dopant-free hole transport *** open-shell quinoid-radical organic semiconductors are not rational candidates for dopant-free HTMs for PSC devices.

关键词： Perovskite solar cells Dopant-free Hole transport materials D-A-π-A-D High glass transition temperature

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