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The effect of air exposure on device performance of flexible C8-BTBT organic thin-film transistors with hygroscopic insulators

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Science China Materials 2020年第12期63卷 2551-2559页

作者： Pengshan Xie Tianjiao Liu Pei He Guozhang Dai Jie Jiang Jia Sun Junliang Yang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

Organic thin film transistors(OTFTs)are normally sensitive to ambient conditions and show performance degradation in *** the contrary,the performance of flexible 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene(C8-BTBT)OTFTs using cross-linked polymer layer,poly(4-vinyl-phenol)-4,4’-(hexafluoroisopropylidene)diphthalic anhydride(PVP-HDA),as the dielectric layer can be improved in air conditions with 40%relative *** soaking in air with 40%relative humidity,the electrical behavior,surface morphology,and contact angle of the flexible C8-BTBT OTFTs using PVP-HAD as dielectric layer with three different thicknesses were *** is found that,when the devices with 375 nm-thick PVP-HDA films are placed in 40%relative humidity air conditions for 6 h,the corrected average mobility(μ)can increase from 3.2 to 5.1 cm^2 V^-1 s^-***,the average threshold voltage(Vth)changes from-12.4 to-9.3 V while keeping a constant ratio of I on/Ioff=10^*** results indicate that the flexible C8-BTBT OTFTs with PVP-HDA dielectric layer exhibit interesting application prospects.

关键词： flexible electronics C8-BTBT OTFTs PVP-HDA hygroscopicity air stability

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Revealing the intrinsic nonlinear optical response of a single MoS_(2) nanosheet in a suspension based on spatial self-phase modulation

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Photonics Research 2020年第11期8卷 1725-1733页

作者： Si Xiao Ying Ma Yilin He Yiduo Wang Hao Xin Qi Fan Jingdi Zhang Xiaohong Li Yu Zhang Jun He Yingwei Wang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

The reorientation of 2D materials caused by nonlocal electron coherence is the formation mechanism of 2D material spatial self-phase modulation under laser irradiation,which is widely known as the“wind-chime”***,we present a method that provides strong evidence for the reorientation of 2D-material-induced spatial self-phase *** traditional“wind-chime”model was modified by taking into account the attenuation,i.e.,damping of the incident light beam in the direction of the optical ***,we can extract the nonlinear refractive index of a single MoS2 nanosheet,instead of simply obtaining the index from an equivalent MoS2 film that was constructed by all *** approach introduces a universal and accurate method to extract intrinsic nonlinear optical parameters from 2D material systems.

关键词： nonlinear intrinsic phase

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Solution-processed perovskite solar cells

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Journal of Central South University 2020年第4期27卷 1104-1133页

作者： CHANG Jian-hui LIU Kun LIN Si-yuan YUAN Yong-bo ZHOU Cong-hua YANG Jun-liang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

Perovskite solar cells(PSCs) have emerged as one of the most promising candidates for photovoltaic applications. Low-cost, low-temperature solution processes including coating and printing techniques makes PSCs promising for the greatly potential commercialization due to the scalability and compatibility with large-scale, roll-to-roll manufacturing processes. In this review, we focus on the solution deposition of charge transport layers and perovskite absorption layer in both mesoporous and planar structural PSC devices. Furthermore, the most recent design strategies via solution deposition are presented as well, which have been explored to enlarge the active area, enhance the crystallization and passivate the defects, leading to the performance improvement of PSC devices.

关键词： perovskite solar cells mesoporous structure planar structure solution process large-scale deposition techniques

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Passivation with crosslinkable diamine yields 0.1 V non-radiative Vloss in inverted perovskite solar cells

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Science Bulletin 2021年第5期66卷 417-420,M0003页

作者： Fang Wan Lili Ke Yongbo Yuan Liming Ding Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Organic-inorganic hybrid perovskite solar cells(PSCs)have attracted continually increasing attention in recent years due to its outstanding photoelectric properties and bright commercial prospect[1–6].So far,the certified power conversion efficiency(PCE)record of PSCs increased up to be 25.2%[7].However,the efficiency for PSCs with inverted structure was generally lower(~22.3%)[8].A major reason for the relatively lower PCE in inverted solar cells was that the achieved open-circuit voltage(V_(oc))was generally lower than that of conventional PSCs based on the same photoactive layers[9–11].

关键词：钙钛矿太阳电池开路电压能量转换效率非辐射复合载流子复合倒置结构 EDA 钝化

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Coupling Stacking Orders with Interlayer Magnetism in Bilayer H-VSe2

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Chinese Physics Letters 2020年第10期37卷 61-67页

作者： Aolin Li Wenzhe Zhou Jiangling Pan Qinglin Xia Mengqiu Long Fangping Ouyang State Key Laboratory of Powder Metallurgy and Powder Metallurgy Research InstituteCentral South UniversityChangsha 410083China School of Physics and Electronics and Hunan Key Laboratory for Super-Microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China School of Physics and Technology Xinjiang UniversityUrumqi 830046China

Stacking-dependent magnetism in van der Waals materials has caught intense *** on the first principle calculations,we investigate the coupling between stacking orders and interlayer magnetic orders in bilayer H-VSe *** is found that there are two stable stacking orders in bilayer H-VSe 2,named AB-stacking and A′*** standard DFT framework,the A′B-stacking prefers the interlayer AFM order and is semiconductive,whereas the AB-stacking prefers the FM order and is ***,under the DFT+U framework both the stacking orders prefer the interlayer AFM order and are *** detailedly analyzing this difference,we find that the interlayer magnetism originates from the competition between antiferromagnetic interlayer super-superexchange and ferromagnetic interlayer double exchange,in which both the interlayer Se-4 p z orbitals play a crucial *** the DFT+U calculations,the double exchange is suppressed due to the opened bandgap,such that the interlayer magnetic orders are decoupled with the stacking *** on this competition mechanism,we propose that a moderate hole doping can significantly enhance the interlayer double exchange,and can be used to switch the interlayer magnetic orders in bilayer VSe *** method is also applicable to a wide range of semiconductive van der Waals magnets.

关键词： stacking interlayer orders

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Tuning the alignment of pentacene on copper substrate by annealing-assistant surface functionalization

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Chinese Physics B 2020年第7期29卷 421-427页

作者： Qiao-Jun Cao Shuang Wen Hai-Peng Xie Bi-Yun Shi Qun Wang Cong-Rong Lu Yongli Gao Wei-Dong Dou Laboratory of Low-dimensional Carbon Materials and Department of Physics Shaoxing UniversityShaoxing 312000China Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China Department of Physics and Astronomy University of RochesterRochesterNY 14627USA

Controlling the alignment and packing structure of organic molecules on solid substrate surfaces at molecule level is essential to develop high-performance organic thin film(OTF)***,which is a typical p-type semiconductor material usually adopts lying-down geometry on metal substrates owning toπ-d coupling between pentacene and metal ***,in this study,we found that pentacene molecules can be adsorbed on an anneal-treated Cu(111)surface with their long axis perpendicular to substrate *** ordered single-layer pentacene film with stand-up molecular geometry was achieved on this *** was found that the functionalization of Cu surface with C=O groups due to annealing treatment should be accounted for standing-up geometry of pentacene on Cu *** observation shed light on the tuning of the alignment and packing structure of organic molecules.

关键词： ultra-thin film molecular alignment metal substrate interfacial tuning

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Boosting acidic water oxidation performance by constructing arrays-like nanoporous Ir_(x)Ru_(1−x)O_(2) with abundant atomic steps

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Nano Research 2022年第7期15卷 5933-5939页

作者： Junjie Li Zan Lian Qiang Li Zhongchang Wang Lifeng Liu Francis Leonard Deepak Yanping Liu Bo Li Junyuan Xu Zuxin Chen CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Technical Institute of Physics&ChemistryChinese Academy of SciencesUrumqi 830011China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China International Iberian Nanotechnology Laboratory(INL) Braga 4715-330Portugal Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China Laboratory of Advanced Spectro-electrochemistry and Li-ion Batteries Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Institute of Semiconductors South China Normal UniversityGuangzhou 510631China

The fabrication of electrocatalysts with high activity and acid stability for acidic oxygen evolution reaction(OER)is an urgent need,yet extremely ***,we report the design and successful fabrication of a high performance self-supported cogwheel arrays-like nanoporous Ir_(x)Ru_(1−x)O_(2) catalyst with abundant atomic steps for acidic OER using a facile alloy-spinningelectrochemical activation method that allows large-scale *** obtained Ir_(x)Ru_(1−x)O_(2) catalysts merely need overpotentials of 211 and 295 mV to deliver catalytic current densities of 10 and 300 mA·cm^(−2) in 0.5 M H_(2)SO_(4),respectively,and can sustain constant OER electrolysis for at least 140 h at a high current density of 300 mA·cm^(−2).Further density functional theory(DFT)calculations uncover that such high intrinsic activities mainly originate from the largely exposed high-index atomic step planes,which markedly lower the limiting potential of the rate-determining step(RDS)of *** findings provide an insight into the exploration of high performance electrocatalysts,and open up an avenue for further developing the state-of-theart Ir and/or Ru-based catalysts for large-scale practical applications.

关键词： oxygen evolution reaction(OER)electrolysis nanoporous structure Ir_(x)Ru_(1−x)O_(2) defects atomic steps

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First-principles study on the p-orbital multiferroicity of single-layer XN (X = Ge, Sn, Pb)

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Results in Physics 2024年 60卷

作者： Xiong, Wei Lei, Bocheng Gao, Yunfei Yang, Ruofan Li, Aolin Ouyang, Fangping School of Physics and Technology Xinjiang Key Laboratory of Solid-State Physics and Devices Xinjiang University Urumqi 830046 China School of Physics Science and Technology Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matter Physics Yili Normal University Yining 835000 China School of Physics Hunan Key Laboratory for Super-Microstructure and Ultrafast Process Hunan Key Laboratory of Nanophotonics and Devices Central South University Changsha 410083 China

Two-dimensional (2D) multiferroic materials have triggered a burst of interest owing to their wide applications in nanoelectronics. Specifically, p-orbital multiferroicity is strongly desired but has been very few reported. Here, based on first-principles calculations, we unveil a new type of 2D multiferroic material: the single-layer (SL) XN (X = Ge, Sn, Pb). Our findings show these materials are ferromagnetic semiconductors with strong magnetoelectric coupling and wide bandgaps. The multiferroicity is related to the unpaired p-orbital electrons of N atoms and the buckled crystal structure. All the single layers show easy-plane magnetocrystalline anisotropy, and the magnetic anisotropy energy increases significantly with the atomic number increasing. Our Monte Carlo simulations suggest the Curie temperature T_C is 205.44 K, 200.45 K, and 287.88 K for SL GeN, SnN, and PbN, respectively. By applying tensile strain, the T_C can be further increased to 225.39 K, 245.35 K, 369.99 K, respectively. Additionally, biaxial strain can induce semiconductor-to-half-metal and ferroelectricity-to-paraelectricity transition in the single layers. We aspire that our work contributes to the exploration of room-temperature p-orbital multiferroicity. © 2024

关键词： Curie temperature In plane biaxial strain P-orbital multiferrosity Semiconductor-to-half-metal Transition Strong magnetoelectric coupling

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Quantum Coherent Control of a Single Molecular-Polariton Rotation

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Physical Review Letters 2023年第4期130卷 043604-043604页

作者： Li-Bao Fan Chuan-Cun Shu Daoyi Dong Jun He Niels E. Henriksen Franco Nori Hunan Key Laboratory of Nanophotonics and Devices Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha 410083 China School of Engineering and Information Technology University of New South Wales Canberra Australian Capital Territory 2600 Australia Department of Chemistry Technical University of Denmark Building 207 DK-2800 Kongens Lyngby Denmark Theoretical Quantum Physics Laboratory RIKEN Saitama 351-0198 Japan Physics Department University of Michigan Ann Arbor Michigan 48109 USA

We present a combined analytical and numerical study for coherent terahertz control of a single molecular polariton, formed by strongly coupling two rotational states of a molecule with a single-mode cavity. Compared to the bare molecules driven by a single terahertz pulse, the presence of a cavity strongly modifies the postpulse orientation of the polariton, making it difficult to obtain its maximal degree of orientation. To solve this challenging problem toward achieving complete quantum coherent control, we derive an analytical solution of a pulse-driven quantum Jaynes-Cummings model by expanding the wave function into entangled states and constructing an effective Hamiltonian. We utilize it to design a composite terahertz pulse and obtain the maximum degree of orientation of the polariton by exploiting photon blockade effects. This Letter offers a new strategy to study rotational dynamics in the strong-coupling regime and provides a method for complete quantum coherent control of a single molecular polariton. It, therefore, has direct applications in polariton chemistry and molecular polaritonics for exploring novel quantum optical phenomena.

关键词： Atoms, ions, & molecules in cavities Cavity quantum electrodynamics Coherent control Hybrid quantum systems Quantum state engineering

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An improved A∗ algorithm for UAV path planning

An improved A∗ algorithm for UAV path planning

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2021 IEEE International Conference on Electrical Engineering and Mechatronics Technology, ICEEMT 2021

作者： Gao, Fengxiao Ding, Jiafeng Liu, Zhengchun Du, Zongze Central South University Hunan Key Laboratory For Super Microstructure and Ultrafast Process Department of Electronic Information Science and Technology School of Physics and Electronics Changsha China Central South University Department of Electronic Information Science and Technology School of Physics and Electronics Changsha China

ISBN: (纸本)9781665441285

The main task of path planning is to provide a safe and feasible path for robot navigation. Although conventional A∗ algorithm can provide a distance-optimized path, there are some collision hazards when UAV cannot follow path perfectly. The proposed algorithm adds the obstacle information to the evaluation function of A∗ algorithm to avoid obstacle-dense area for planning. Besides, in order to compensate computing time increased by the improved evaluation function, an extended search step size is added to the A*, which performs better in the obstacle-sparse area. and simulation results also prove the above advantages. © 2021 IEEE.

关键词： Motion planning

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