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In-plane electron-phonon coupling anisotropy and multiple charge density wave orders in the superconductor Bi2Rh3Se2

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Physical Review B 2023年第4期108卷 045118-045118页

作者： Yongsong Wang Bo Chen Zi-Teng Liu Xiao Guo Siwen You Zihan Wang Haipeng Xie Tianchao Niu Jian-Qiao Meng Han Huang School of Physics and Electronics Hunan Key Laboratory of Super-microstructure and Ultrafast Process Central South University 932 South Lushan Road Changsha Hunan 410083 People's Republic of China Beihang Hangzhou Innovation Institute Yuhang Xixi Octagon City Yuhang District Hangzhou 310023 China

The ternary chalcogenide superconductor Bi2Rh3Se2 was discovered to have charge density wave (CDW) order and electron-phonon coupling (EPC). However, it is still debated whether the phase transition at ∼240K is a CDW one. Here, we systematically performed Raman scattering investigations on single-crystal Bi2Rh3Se2. Angle-resolved polarized Raman spectroscopic measurements reveal the in-plane anisotropic EPC in Bi2Rh3Se2, which inhibits the Raman intensity. Temperature-dependent x-ray diffraction and Raman measurements indicate the existence of the incommensurate (ICCDW) and commensurate (CCDW) CDW orders below ∼250 and ∼170 K, respectively, in Bi2Rh3Se2. The appearance of zone-folded phonon modes at ∼170 K confirms the CCDW-induced 2×2 reconstruction of the Brillouin zone. Semiquantitative analysis based on Landau theory of second-order phase transitions of CDW-correlated and uncorrelated phonon modes reflects extensive coupling between the phonons and CDW orders. Our findings elucidate the existence of CCDW and ICCDW and confirm the critical role of EPC in CDW transitions in Bi2Rh3Se2.

关键词： Charge density waves Lattice dynamics Phonons Quasiparticles & collective excitations Transition temperature Chalcogenides Raman spectroscopy

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Facet-Controlled LiMn_(2)O_(4)/C as Deionization Electrode with Enhanced Stability and High Desalination Performance

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Nano-Micro Letters 2022年第11期14卷 75-86页

作者： Yuxin Jiang Liyuan Chai Dehe Zhang Fangping Ouyang Xiangyuan Zhou Sikpaam IAlhassan Sailin Liu Yingjie He Lvji Yan Haiying Wang Wenchao Zhang School of Metallurgy and Environment Central South UniversityChangsha 410083People’s Republic of China Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Changsha 410083People’s Republic of China Water Pollution Control Technology Key Lab of Hunan Province Changsha 410083People’s Republic of China School of Physics and Electronics Hunan Key Laboratory for Super-Microstructure and Ultrafast Processand Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083People’s Republic of China State Key Laboratory of Powder Metallurgy and Powder Metallurgy Research InstituteCentral South UniversityChangsha 410083People’s Republic of China School of Chemical Engineering and Advanced Materials Faculty of SciencesEngineering and TechnologyThe University of AdelaideAdelaide 5005Australia

Battery materials as emerging capacitive deionization electrodes for desalination have better salt removal capacities than traditional carbon-based ***_(2)O_(4),a widely used cathode mate-rial,is difficult to utilize as a deionization electrode due to its structural instability upon cycling and Mn dissolution in aqueous-based ***,a facile and low-cost ball-milling routine was proposed to prepare a LiMn_(2)O_(4)material with highly exposed(111)*** prepared electrode exhibited relatively low dissolution of Mn during cycling,which shows its long cycle *** the hybrid capacitive deionization system,the LiMn_(2)O_(4)/C electrode delivered a high desalination capacity of 117.3 mg g^(−1) without obvious capacity decay at a voltage of 1.0 V with a 20 mM initial salt *** addition,the exposed(111)facets significantly alleviated Mn ion dissolution,which also enhanced the structural steadiness.

关键词： Deionization electrode Desalination Lithium-ion battery

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High-speed doctor-blading PM 6:L 8-BO organic solar cells from non-halogenated green solvent with a module efficiency of 16.07%

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Journal of Central South University 2024年第12期31卷 4297-4306页

作者： FENG Er-ming ZHANG Chu-jun HAN Yun-fei CHANG Jian-hui YANG Fang LI Heng-yue LUO Qun MA Chang-qi ZOU Ying-ping DING Li-ming YANG Jun-liang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of PhysicsCentral South UniversityChangsha 410083China i-Lab&Printable Electronics Research Center Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China College of Chemistry and Chemical Engineering Central South UniversityCentral South UniversityChangsha 410083China Center for Excellence in Nanoscience Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Highly efficient organic solar cells(OSCs)are normally produced using the halogenated solvents chloroform or chlorobenzene,which present challenges for scalable manufacturing due to their toxicity,narrow processing window and low boiling ***,we develop a novel high-speed doctor-blading technique that significantly reduces the required concentration,facilitating the use of eco-friendly,non-halogenated solvents as alternatives to chloroform or *** utilizing two widely used high-boiling,non-halogenated green solvents-o-xylene(o-XY)and toluene(Tol)-in the fabrication of PM 6:L 8-BO,we achieve power conversion efficiencies(PCEs)of 18.20%and 17.36%,***,a module fabricated with o-XY demonstrates a notable PCE of 16.07%.In-situ testing and morphological analysis reveal that the o-XY coating process extends the liquid-to-solid transition stage to 6 s,significantly longer than the 1.7 s observed with Tol *** prolonged transition phase is crucial for improving the crystallinity of the thin film,reducing defect-mediated recombination,and enhancing carrier mobility,which collectively contribute to superior PCEs.

关键词： organic solar module high-speed doctor-blading non-halogenated solvent green solvent

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Evidence for moiréintralayer excitons in twisted WSe_(2)/WSe_(2) homobi layer superlattices

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Light(Science & Applications) 2022年第7期11卷 1493-1500页

作者： Biao Wu Haihong Zheng Shaofei Li Junnan Ding Jun He Yujia Zeng Keqiu Chen Zongwen Liu Shula Chen Anlian Pan Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South University932 South Lushan RoadChangshaHunan 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South University932 South Lushan RoadChangshaHunan 410083China Department of Applied Physics School of Physics and ElectronicsHunan UniversityChangsha 410082China School of Chemical and Biomolecular Engineering The University of SydneySydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneySydneyNSW 2006Australia Hunan Institute of Optoelectronic Integration College of Materials Science and EngineeringHunan UniversityChangshaHunan 410082China Shenzhen Research Institute of Central South University A510aVirtual University BuildingSouthern DistrictHigh-tech Industrial ParkYuehai StreetNanshan DistrictShenzhenChina

Recent advances in twisted van der Waals heterostructure superlattices have emerged as a powerful and attractive platform for exploring novel condensed matter physics due to the interplay between the moirépotential and Coulomb *** moirésuperlattices act as a periodic confinement potential in space to capture interlayer excitons(IXs),resulting in moiréexciton arrays,which provide opportunities for quantum emitters and many-body *** observation of moiréIXs in twisted transition-metal dichalcogenide(TMD)heterostructures has recently been widely ***,the capture and study of the moiréintralayer excitons based on TMD twisted homobilayer(T-HB)remain ***,we report the observation of moiréintralayer excitons in a WSe_(2)/WSe_(2) T-HB with a small twist angle by measuring PL *** multiple split peaks with an energy range of 1.55-1.73 eV are different from that of the monolayer WSe_(2) exciton *** split peaks were caused by the trapping of intralayer excitons via the moiré*** confinement effect of the moirépotential on the moiréintralayer excitons was further demonstrated by the changing of temperature,laser power,and valley *** findings provide a new avenue for exploring new correlated quantum phenomena and their applications.

关键词： twisted layer quantum

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Ultraviolet-Selective Organic Phototransistors for Low-Power Skin-Inspired Nociceptor

SSRN

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SSRN 2023年

作者： Shi, Xiaofang Liu, Wanrong Xu, Yunchao Jin, Chenxing Zhang, Gengming Shi, Yiming Huang, Han Sun, Jia Yang, Junliang Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Hunan Changsha410083 China Hunan Key Laboratory of Nanophotonics and Devices School of Physics and Electronics Central South University 932 South Lushan Road Hunan Changsha410083 China

Skin-inspired nociceptors are particularly important for future neurorobotic technology. In this work, an artificial skin nociceptor based on ultraviolet (UV)-selective C8-BTBT phototransistors was reported. By using polymethyl methacrylate as an interfacial modification layer, a large number of standing crystals appeared in the C8-BTBT film, and the photo-dark current ratio of the devices exceeded the value of 1010. The main biological synaptic behaviors of the devices under UV light stimuli were also thoroughly investigated. Interestingly, the minimum power consumption per synaptic event (2.45 fJ) is comparable to the energy required by the biological synapses. The biological behavior of the skin-inspired nociceptor was further simulated, such as allodynia, hyperalgesia, and the self-protection behavior under UV light stimulation. Finally, as a proof of concept, the skin-inspired nociceptor was proposed to be integrated with the UV-transmittance modulator to protect against excess UV stimulation, which fully demonstrated its potential applications in bionic electronics technology. © 2023, The Authors. All rights reserved.

关键词： Phototransistors

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Stress compensation based on interfacial nanostructures for stable perovskite solar cells

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Interdisciplinary Materials 2023年第2期2卷 348-359页

作者： Cheng Zhu Xi Wang Hangxuan Li Chenyue Wang Ziyan Gao Pengxiang Zhang Xiuxiu Niu Nengxu Li Zipeng Xu Zhenhuang Su Yihua Chen Huachao Zai Haipeng Xie Yizhou Zhao Ning Yang Guilin Liu Xueyun Wang Huanping Zhou Jiawang Hong Xingyu Gao Yang Bai Qi Chen Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications MIIT Key Laboratory for Lowdimensional Quantum Structure and DevicesExperimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijingChina School of Aerospace Engineering Beijing Institute of TechnologyBeijingChina Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijingChina Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghaiChina Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangshaChina School of Science Jiangnan University WuxiWuxiJiangsuChina

The long-term stability issue of halide perovskite solar cells hinders their *** residual stress-strain affects device stability,which is derived from the mismatched thermophysical and mechanical properties between adjacent *** this work,we introduced the Rb_(2)CO_(3)layer at the interface of SnO_(2)/perovskite with the hierarchy morphology of snowflake-like microislands and dendritic *** a suitable thermal expansion coefficient,the Rb_(2)CO_(3)layer benefits the interfacial stress relaxation and results in a compressive stress-strain in the perovskite ***,reduced nonradiative recombination losses and optimized band alignment were *** enhancement of open-circuit voltage from 1.087 to 1.153 V in the resultant device was witnessed,which led to power conversion efficiency(PCE)of 22.7%(active area of 0.08313 cm^(2))and 20.6%(1 cm2).Moreover,these devices retained 95%of its initial PCE under the maximum power point tracking(MPPT)after 2700 *** suggests inorganic materials with high thermal expansion coefficients and specific nanostructures are promising candidates to optimize interfacial mechanics,which improves the operational stability of perovskite cells.

关键词： interfacial nanostructures long-term stability perovskite solar cells strain engineering thermal expansion coefficient

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Improving Contact and Passivation of Buried Interface by Anionic Surfactant For Planar Perovskite Solar Cells

SSRN

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SSRN 2024年

作者： Deng, Ke Li, Hongxing Chen, Hanyue Li, Miao Ke, Lili Du, Wenjuan Xiong, Jian Zhou, Conghua Liu, Gang Hunan Key Laboratory for Micro-Nano Energy Materials and Devices School of Physics and Optoelectronics Xiangtan University Hunan411105 China Guangxi Key Laboratory of Information Materials School of Materials Science and engineering Guilin University of Electronic Technology Guilin541004 China Hunan Key Laboratory of Super-microstructure and Ultrafast Process School of Physics and Electronics Central South University Hunan Province Changsha410083 China

Organic-inorganic perovskite solar cells (PSCs) are attracting a lot of attention because of their simple structure and ease of manufacture. In planar PSCs, the presence of defect states and imperfect contact of the buried interface are major obstacles to further efficiency improvement. In this work, the contact and passivation of the SnO2/perovskite interface are improved by incorporating sodium dodecyl sulfate (SDS) molecules into the SnO2 film. Through dynamic light scattering (DLS) analysis, we find that the SDS molecules can inhibit the agglomeration of SnO2 nanoparticles in solution, forming a uniform and compact film. Meanwhile, the SDS modification can significantly improve the electrical property of SnO2 ETL and passivate the interfacial defects, thus promoting effective charge transfer and reducing carrier recombination. As a consequence, the SDS-modified device has a much higher PCE (22.10%) with significantly reduced hysteresis than the control device (19.76%). © 2024, The Authors. All rights reserved.

关键词： Perovskite solar cells

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First-principles study of spin-orbital coupling induced ferroelectricity in NiBr2

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Physical Review B 2023年第5期108卷 054429-054429页

作者： Da-Wei Wu Yong-Bo Yuan Shuang Liu Meng-Qiu Long Yun-Peng Wang School of Physics and Electronics Hunan Key Laboratory for Super-Micro Structure and Ultrafast Process Central South University 932 South Lushan Road Changsha 410083 People's Republic of China

Two-dimensional multiferroic materials have attracted wide interest due to their intriguing physical properties and strong electromagnetic coupling. Among them, NiBr2 is unique with a temperature dependent magnetic modulation vector Q which is linearly related to the electric polarization. In this work, we perform first-principles calculations on the NiBr2 monolayer. Density functional theory calculations with appropriate Hubbard correction reproduce the electric polarization and its linear dependence on the magnitude of Q. The calculated polarization decreases as the Hubbard parameter U increases which enlarges the electronic band gap. Our results suggest the spin-orbital coupling effect of Br ions play a crucial role in generating the polarization. Wannier function analysis proves that the major contributor to electric polarization is the Br atomic orbitals which are strongly hybridized with Ni orbitals. The atomic position relaxation has a negligible contribution to the polarization.

关键词： Ferroelectricity Multiferroics Noncollinear magnets Density functional calculations

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Observation of double indirect interlayer exciton in MoSe_(2)/WSe_(2) heterostructure

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Nano Research 2022年第3期15卷 2661-2666页

作者： Biao Wu Yunpeng Wang Jiahong Zhong Cheng Zeng Yassine Madoune Wanting Zhu Zongwen Liu Yanping Liu School of Physics and ElectronicsHunan Key Laboratory for Super-microstructure and Ultrafast Process Central South University932 South Lushan RoadChangshaHunan 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South University932 South Lushan RoadChangshaHunan 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 A510aVirtual University BuildingSouthern DistrictHigh-tech Industrial ParkYuehai StreetNanshan DistrictShenzhen 518057China

Interlayer excitons(IXS)are electron–hole pairs bound in the spatial separation layer by the Coulomb effect,and their lifetime is several orders of magnitude longer than that of direct excitons,providing an essential platform for long-lived exciton *** recent emergence of the van der Waals heterostructure(HS),which combines two layers of different transitional metal dichalcogenides(TMDs),has created new opportunities for IX ***,we demonstrate the observation of double indirect interlayer excitons in the MoSe_(2)/WSe_(2)HS using photoluminescence(PL)*** intensities of the two peaks are essentially the same,and the energy difference is 22 meV,which is perfectly in line with the calculation result of density functional ***,the experience of variable excitation power also proves that the splitting of the IXs originates from the conduction band spin-splitting of MoSe_(2).The observation results provide a promising platform for further exploring the new physical properties and optoelectronic phenomena of TMD HS.

关键词： transitional metal dichalcogenides heterostructure interlayer exciton photoluminescence density functional theory

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Saturable absorption and reverse saturable absorption of CdGa2Se4 nanoparticles determined by bond strength

SSRN

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SSRN 2022年

作者： Xiao, Xingcheng Zhu, Haixia Wang, Chang Wang, Yingwei Fan, Wenxuan He, Jun Zhong, Mianzeng Xiao, Si Chen, Zhihui Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and Electronics Central South University 932 South Lushan Road Hunan Changsha410083 China

The nonlinear optical (NLO) properties of selenide gallium-cadmium (CdGa2Se4) nanoparticles (NPs) are investigated by femtosecond open-aperture Z-scan technique. The results show that they exhibit saturable absorption at 400 nm while reverse saturable absorption at 800 nm, which is ascribed to single-photon absorption and two-photon absorption, respectively. The NLO response conversion can be attributed to its band gap determined by the moderate bond strength of gallium and selenium atoms. An empirical equation for band gap and proton number of CdGa2Se4’s belonging class of compounds is proposed. It can be used to estimate the band gap values of this class of compounds and predict their nonlinear optical responses at different waveband. © 2022, The Authors. All rights reserved.

关键词： Energy gap

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