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Ion migration in perovskite solar cells

Journal of Semiconductors 2021年第1期42卷 1-4页

作者： Xiaoxue Ren Lixiu Zhang 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 University of Chinese Academy of Sciences Beijing 100049China

The past few years have witnessed a remarkable progress of perovskite solar cells(PSCs),which can be attributed to the high light absorption coefficient,tunable bandgap,long carrier diffusion length,solution processab... 详细信息

关键词： materials. perovskite attributed

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Effects of 3d-transition metal doping on the electronic and magnetic properties of one-dimensional diamond nanothread

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Chinese Physics B 2020年第6期29卷 358-363页

作者： Zhenzhen Miao Can Cao Bei Zhang Haiming Duan Mengqiu Long Institute of Low-dimensional Quantum Materials and Devices School of Physics Science and TechnologyXinjiang UniversityUrumqi 830046China Hunan Key Laboratory of Super Micro-structure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

The diamond nanothread(DNT), a new one-dimensional(1 D) full carbon sp3 structure that has been successfully synthesized recently, has attracted widespread attention in the carbon community. By using the first-principles calculation method of density functional theory(DFT), we have studied the effects of 3 d transition metal(TM) atomic doping on the electronic and magnetic properties of DNT. The results show that the spin-polarized semiconductor characteristics are achieved by doping Sc, V, Cr, Mn, and Co atoms in the DNT system. The magnetic moment ranges from 1.00 μB to 3.00 μB and the band gap value is from 0.35 e V to 2.54 e V. The Fe-doped DNT system exhibits spin-metallic state with a magnetic moment of 2.58 μB, while the Ti and Ni-doped DNT systems are nonmagnetic semiconductors. These results indicate that the 3 d TM atoms doping can modulate the electronic and magnetic properties of 1 D-DNT effectively, and the TM-doped DNT systems have potential applications in the fields of electronics, optoelectronics, and spintronics.

关键词： diamond nanothread transition metal atom doping electronic and magnetic property

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Adjusting energy level alignment between HTL and CsPbI_(2)Br to improve solar cell efficiency

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Journal of Semiconductors 2021年第3期42卷 11-13页

作者： Zihan Zhang Jia Li Zhimin Fang Haipeng Xie Yongbo Yuan Chuantian Zuo Liming Ding Bin Yang College of Materials Science and Engineering Hunan UniversityChangsha 410082China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China Hunan Key Laboratory of Super Microstructure and Ultrafast Process College of Physics and ElectronicsCentral South UniversityChangsha 410083China

Lead halide perovskites are at the forefront of optoelectronic materials due to their high absorption coefficient,tunable bandgap,long carrier diffusion length,and small exciton binding energy[1−3],yielding high-perfo... 详细信息

关键词： optoelectronic tunable alignment

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High-throughput calculation of large spin Hall conductivity in heavy-metal-based antiperovskite compounds

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Materials Genome Engineering Advances 2024年

作者： Xiong Xu J. X. Lv Y. Wang Min Li Zhe Wang Hui Wang School of Physics Hunan Key Laboratory of Super Microstructure and Ultrafast Process Hunan Key Laboratory of Nanophotonics and Devices State Key Laboratory of Powder Metallurgy Central South University Changsha China Department of Physics and Astronomy University of California Irvine California USA

Spin Hall effect (SHE) provides a promising solution to the realization of advantageous functionalities for spin-based recording and information processing. In this work, we conduct high-throughput calculations on the spin Hall conductivity (SHC) of antiperovskite compounds with the composition ZXM 3 , where Z is a nonmetal, X is a metal, and M is a platinum group metal. From an initial database over 4500 structures, we screen 295 structurally stable compounds and identify 24 compounds with intrinsic SHC exceeding 500 (ℏ/e) (Ω⁻ 1 cm⁻ 1 ). We reveal a strong dependence of SHC on spin-orbit coupling-induced energy splitting near the Fermi level. In addition, SHCs can be regulated through proper doping of electrons or holes. The present work establishes high-throughput database of SHC in antiperovskites which is crucial for designing future electric and spintronic devices.

关键词： AB initio simulation bulk material computational materials science high-throughput computing materials database

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FLIM as a Promising Tool for Cancer Diagnosis and Treatment Monitoring

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Nano-Micro Letters 2021年第9期13卷 48-74页

作者： Yuzhen Ouyang Yanping Liu Zhiming MWang Zongwen Liu Minghua Wu Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya Medical School Central South UniversityChangsha 410013HunanPeople’s Republic of China School of Physics and Electronics Hunan Key Laboratory for Super-Microstructure and Ultrafast ProcessCentral South University932 South Lushan RoadChangsha 410083HunanPeople’s Republic of China The Key Laboratory of Carcinogenesis of the Chinese Ministry of Health The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of EducationCancer Research InstituteCentral South UniversityChangsha 410008HunanPeople’s Republic of China Shenzhen Research Institute of Central South University A510aVirtual University BuildingNanshan DistrictSouthern DistrictHigh-tech Industrial ParkYuehai StreetShenzhenPeople’s Republic of China State Key Laboratory of High-Performance Complex Manufacturing Central South University932 South Lushan RoadChangsha 410083HunanPeople’s Republic of China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054SichuanPeople’s Republic of China School of Chemical and Biomolecular Engineering The University of SydneySydneyNSW 2006Australia

Fluorescence lifetime imaging microscopy(FLIM)has been rapidly developed over the past 30 years and widely applied in biomedical *** progress in fluorophore-dyed probe design has widened the application prospects of *** fluorescence lifetime is sensitive to microenvironments and molecule alterations,FLIM is promising for the detection of pathological *** cancer-related FLIM applications can be divided into three main categories:(i)FLIM with autofluorescence molecules in or out of a cell,especially with reduced form of nicotinamide adenine dinucleotide,and flavin adenine dinucleotide for cellular metabolism research;(ii)FLIM with Förster resonance energy transfer for monitoring protein interactions;and(iii)FLIM with fluorophore-dyed probes for specific aberration *** in nanomaterial production and efficient calculation systems,as well as novel cancer biomarker discoveries,have promoted FLIM optimization,offering more opportunities for medical research and applications to cancer diagnosis and treatment *** review summarizes cutting-edge researches from 2015 to 2020 on cancer-related FLIM applications and the potential of FLIM for future cancer diagnosis methods and anti-cancer therapy *** also highlight current challenges and provide perspectives for further investigation.

关键词： Fluorescence lifetime imaging microscopy Förster resonance energy transfer Reduced form of nicotinamide adenine dinucleotide Biosensors Cancer

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Generation of fractional and multiple imaginary rotational alignment echoes

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Physical Review A 2021年第5期104卷 053105-053105页

作者： Zhenzhong Lian Zhan Hu Hongxia Qi Dehou Fei Sizuo Luo Zhou Chen Chuan-Cun Shu Institute of Atomic and Molecular Physics Advanced Light Field and Modern Medical Treatment Science and Technology Innovation Center of Jilin Province Jilin University Changchun 130012 China 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

We present a theoretical investigation to understand the connection between the formation of different rotational alignment echoes and the underlying excitation pathways induced by temporally delayed laser pulses. The fractional and multiple imaginary alignment echoes are predicted and demonstrated in the linear polar molecule carbonyl sulfide. We also use a two-dimensional spectrum obtained from higher-order alignment echo signals to identify the underlying quantum coherence. This work deepens our understanding of the alignment echo phenomenon. It provides a way to gain insight into the relationship between the echo signal and the underlying pathway with potential applications in rotational echo spectroscopy.

关键词： Molecular spectra Strong field excitation Ultrashort pulses Molecules Schroedinger equation

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Quantized charge-pumping in higher-order topological insulators

arXiv

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arXiv 2022年

作者： Wu, Bing-Lan Guo, Ai-Min Zhang, Zhi-Qiang Jiang, Hua Gusu Laboratory of Materials Suzhou215123 China Institute for Advanced Study Soochow University Suzhou215006 China Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha410083 China School of Physical Science and Technology Soochow University Suzhou215006 China

We study the quantized charge pumping of higher-order topological insulators (HOTIs) with edge-corner correspondences based on the combination of the rotation of in-plane magnetic field and the quantum spin Hall effect. A picture of a specific charge pumping process is uncovered with the help of the non-equilibrium Green's function method. Significantly, we demonstrate that the quantized charge pumping current is achieved without the participation of bulk states, and the charges move along the boundary of the sample. Furthermore, the effects of external parameters on the pumping current is also studied. We find that the magnitude and direction of the pumping current can be manipulated by adjusting the coupling strength between the leads and sample. Our work deepens the understanding of the charge pumping in HOTIs and extends the study of their transport properties. Copyright © 2022, The Authors. All rights reserved.

关键词： Electric insulators

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One-dimensional model for coupling between magnon and optical phonon

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Physical Review B 2021年第15期104卷 155132-155132页

作者： Xiao-Yan Chen 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 People's Republic of China

In this work, we propose and study a one-dimensional model of the effects of optical phonon/magnon coupling. The indirect interactions between magnetic ions are conducted by the sandwiched nonmagnetic ions. The vibrations of nonmagnetic ions invoke effective magnetic fields to spins and hence couple with the magnon. The quantum solutions of the model show energy gaps in the spin-wave dispersion induced by the magnon-phonon coupling. Classical simulations reveal the existence of hybrid magnon-phonon quasiparticles and the coherent phonon (magnon) induced by magnon (phonon).

关键词： Magnetoelastic effect Magnons Optical phonons 1-dimensional spin chains Classical spin chains Quantum spin chains

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Thin-film growth behavior of non-planar vanadium oxide phthalocyanine

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Chinese Physics B 2019年第8期28卷 369-375页

作者： Tian-Jiao Liu Hua-Yan Xia Biao Liu Mei Fang Jun-Liang Yang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China Department of Chemistry University of WarwickCoventryCV47ALUnited Kinedom

The thin film properties of organic semiconductors are very important to the device ***,non-planar vanadyl phthalocyanine(VOPc)thin films grown on rigid substrates of indium tin oxide,silicon dioxide,and flexible substrate of kapton by organic molecular beam deposition under vacuum conditions are systematically studied via atomic force microscopy and x-ray *** results clearly reveal that the morphology and grain size are strongly dependent on the substrate temperature during the process of film ***,the VOPc films with the structure of phase I or phase II can be modulated via in situ annealing and post-annealing ***,the crystalline structure and molecular orientation of vapor-deposited VOPc can be controlled using molecular template layer 3,4,9,10-perylenetetracarboxylic dianhydride(PTCDA),the VOPc film of which exhibits the phase I *** deep understanding of growth mechanism of non-planar VOPc film provides valuable information for controlling structure-property relationship and accelerates the application in electronic and optoelectronic devices.

关键词： organic semiconductor thin film vanadyl phthalocyanine(VOPc) growth behavior

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Recrystallization Behavior and Phase Transformation in a Hot-Rolled Pure Cobalt During Annealing at the Elevated Temperature

SSRN

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SSRN 2022年

作者： Song, Kerui Xiao, Zhu Li, Zhou Fang, Mei Zhu, Yuntian Lei, Qian School of Materials Science and Engineering Central South University Changsha410083 China State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha410083 China Key Laboratory of Non-ferrous Metal Materials Science and Engineering Ministry of Education Changsha410083 China

The evolution of microstructure and properties of the hot rolled cobalt during the isothermal annealing at different temperature was investigated. Recrystallization only occurred in HCP-Co at low annealing temperature, the proportion of FCC-Co decreased dramatically and become HCP-Co single-phase with the annealing time due to the diffusive phase transformation promoted by HABs. For samples annealed above 400°C, recrystallization occurred in both of HCP-Co and FCC-Co. The proportion of FCC-Co reached the highest value of 50% in samples annealed at 400°C for 4h, and the average grain size is only about 2.5 μm even after 12h annealing due to the formation of special boundaries, annealing twins and the alternate permutation of nano FCC-Co lamellae and HCP-Co lamellae. The recrystallization mechanism was analyzed by the Johnson-Mehl-Avrami-Kolmogorov model and modified Arrhenius relationship. The nucleation and grain growth through the migration of HABs promote the FCC→HCP diffusive phase transformation at low annealing temperature. At high temperature, recrystallization kinetics of HCP-Co and migration of HABs was restricted by reverse martensitic transformation. © 2022, The Authors. All rights reserved.

关键词： Recrystallization (metallurgy)

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