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Kinetic Monte Carlo simulation of film morphologies at the initial stages

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Science China(Physics,Mechanics & Astronomy) 2008年第1期51卷 56-63页

作者： ZheNG XiaoPing ZHANG PeiFeng he deyan LI Lian State Key Lab.of Advanced Non-Ferrous Materials Lanzhou University of TechnologyLanzhou 730050China Institute of Electronic Information Science and Technology Lanzhou City UniversityLanzhou 730070China Post-Doctor Working Station Lanzhou UniversityLanzhou 730070China

The morphologies at the initial stages of thin film growth were studied by using Kinetic Monte Carlo techniques.A more efficient model was used to calculate the activity *** model involves incident atom attachment,diffusion,detachment from the surface,detached atom returning,and dimer *** edited a set of software of the model and simulated the surface morphologies by the principle of computer *** is shown that the nucleuses formed at the initial stages and the surface morphologies at high temperatures are very different from those at low *** later surface growth depends on the nucleuses at the initial *** mechanism results from the atom thermal movement,the temperature determines the diffusion ability,and the deposition rate determines the diffusion time.

关键词： film initial stage morphologies simulation Kinetic Monte Carlo(KMC)

Ultraviolet Photoconductance of a Single hexagonal WO_(3) Nanowire

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Nano Research 2010年第4期3卷 281-287页

作者： Kai Huang Qing Zhang Feng Yang deyan he Microelectronics Center School of Electrical and Electronics EngineeringNanyang Technological UniversitySingapore 639798 School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China

The ultraviolet (UV) photoconductance properties of a single hexagonal WO_(3) nanowire have been studied systematically. The conductance of WO_(3) nanowires is very sensitive to ultraviolet B light and a field-effect transistor (FET) nanodevice incorporating a single WO_(3) nanowire exhibits excellent sensitivity, reversibility, and wavelength selectivity. A high photoconductivity gain suggests that WO_(3) nanowires can be used as the sensing element for UV photodetectors. Measurements under UV light in vacuum show that the adsorption and desorption of oxygen molecules on the surface of the WO_(3) nanowire can significantly influence its photoelectrical properties. The WO_(3) nanowires have potential applications in biological sensors, optoelectronic devices, optical memory, and other areas.

关键词： hexagonal WO_(3)nanowire ultraviolet photodetector

Study on performance of PVDF piezoelectric film for the separator in Li-ion rechargeable cell

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Science China(Technological Sciences) 2013年第11期56卷 2646-2648页

作者： LIU YingQi LI XiuWan WEI XiuCheng he deyan School of Physical Science and Technology and Key Laboratory for Magnetism and Magnetic Materials of the Ministry of EducationLanzhou University

The properties of piezoelectric PVDF films as separators are studied in NiO/Li electrodes Li-ion power *** results show that the PVDF piezoelectric film with excellent insulation is suitable for the environmental energy harvesting *** is attributable to the compact structure of the piezoelectric PVDF film,and which make it has low leakage current and low charge-discharge current characteristics.

关键词： PVDF piezoelectric film Li-ion rechargeable cell separator

泡沫镍上生长的具有三明治纳米结构的MnCo_(2)O_(4)@NiCoMnS_(4)用于高性能水系非对称超级电容器

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Science China Materials 2024年第3期67卷 816-823页

作者：陈勇超李亚丽董云霞李东昊沈思锦胡继东付玉军贺德衍栗军帅 LONGi Institute of Future Technology and School of Materials&EnergyLanzhou UniversityLanzhou 730000China

本文介绍了一种由水热生长的MnCo_(2)O_(4)(MCO)纳米线以及随后电沉积的NiCoMnS_(4)(NCMS)纳米片组成的高性能超级电容器电极材料,即泡沫镍上生长的MCO@NCMS.由于其多孔和互联的纳米结构以及MCO和NCMS的协同效应,在1 mA cm^(-2)处实现了... 详细信息

本文介绍了一种由水热生长的MnCo_(2)O_(4)(MCO)纳米线以及随后电沉积的NiCoMnS_(4)(NCMS)纳米片组成的高性能超级电容器电极材料,即泡沫镍上生长的MCO@NCMS.由于其多孔和互联的纳米结构以及MCO和NCMS的协同效应,在1 mA cm^(-2)处实现了12,020.8 mF cm^(-2)的高电容,并展现出良好的倍率性能以及循环稳定性.电化学测试表明,组装成的水性非对称超级电容器在0.800 mW cm^(-2)的功率密度下,达到0.611 mW h cm^(-2)的高能量密度并具有良好的循环稳定性,即在15,000次充放电循环后,容量保持率可达90%,且保持100%的库仑效率.

关键词： sandwich structure high energy density transition metal sulfides aqueous asymmetric supercapacitor transition metal oxides

Preparation and electrochemical performance of MWCNTs@MnO_2 nanocomposite for lithium ion batteries

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Science China(Technological Sciences) 2014年第6期57卷 1077-1080页

作者： LIU YingQi LI XiuWan WEI ZhiWei ZHANG LiPing WEI XiuCheng he deyan School of Physical Science and Technology and Key Laboratory for Magnetism and Magnetic Materials of the Ministry of EducationLanzhou University

Tubular nanocomposite with interconnected MnO2 nanoflakes coated on MWCNTs(MWCNTs@MnO2)was fabricated by an aqueous solution method at 80°*** electron microscopy,X-ray diffraction and galvanostatic charge-discharge tests were used to characterize the structures and electrochemical performances of the as-prepared *** capacity reaches 1233.6 mA h g-1 at a current density of 100 mA g-1 for the first discharge,and it can still maintain a capacity of 633.1mA h g-1 after 100 charge-discharge *** results show that MWCNTs with good electrical conductivity as anchors of MnO2 can provide fast electron transport channels for MnO2 in the electrochemical reactions,and the as-prepared MWCNTs@MnO2 nanocomposite is a potential anode material for lithium ion batteries.

关键词： manganese dioxide multi-walled carbon nanotubes nanocomposite aqueous solution preparation electrochemical performances lithium ion battery

Annealing effects on the photoluminescence of Pb-ion irradiated he-doped sapphire

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Science China(Physics,Mechanics & Astronomy) 2012年第10期55卷 1803-1807页

作者： SONG Yin ZHANG ChongHong he deyan ZHANG LiQing GOU Jie YANG YiTao LI JianJian School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

In the present work, the photoluminescence （PL） character of single crystal sapphire （A1203） samples with and without im- plantation by 110 keV he and/or irradiation by 230-MeV Pb ions, as well as subsequently annealing at 600, 900 and 1100 K （TA） was studied. The modification of the structure and optical properties induced by ion irradiation were analyzed by using PL and FTIR spectra. The PL measurements showed that luminescence peaks located at 390, 413,450, and 564 nm appeared in irradiated samples. The luminescence peaks appeared at 360, 380, and 516 nm after annealing. Infrared spectra showed a broad- ening of the absorption band between 460 cm^-1 and 510 cm^-1, which indicated the formation of strongly damaged regions in the Al2O3 samples. The position shift of the absorption band in 1000-1300 cm^-1 tended towards to a higher wavelength.

关键词： ion irradiation Al2O3 PL spectra

MXenes for Solar Cells

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Nano-Micro Letters 2021年第5期13卷 90-106页

作者： Lujie Yin Yingtao Li Xincheng Yao Yanzhou Wang Lin Jia Qiming Liu Junshuai Li Yali Li deyan he Key Laboratory of Special Function Materials and Structure Design of the Ministry of Education and School of Physical Science and TechnologyLanzhou University222 South Tianshui RoadLanzhou 730000People’s Republic of China

Application of two-dimensional MXene materials in photovoltaics has attracted increasing attention since the first report in 2018 due to their metallic electrical conductivity,high carrier mobility,excellent transparency,tunable work function and superior mechanical *** this review,all developments and applications of the Ti3C2Tx MXene(here,it is noteworthy that there are still no reports on other MXenes’application in photovoltaics by far)as additive,electrode and hole/electron transport layer in solar cells are detailedly summarized,and meanwhile,the problems existing in the related studies are also *** view of these problems,some suggestions are given for pushing exploration of the MXenes’application in solar *** is believed that this review can provide a comprehensive and deep understanding into the research status and,moreover,helps widen a new situation for the study of MXenes in photovoltaics.

关键词： Ti3C2Tx MXene Solar cells Additives Hole/electron transport layers Electrodes

Field electron emission of diamond films on nanocrystalline diamond coating by CVD method

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Chinese Science Bulletin 2003年第18期48卷 1934-1937页

作者： CAI Rangqi CheN Guanghua SONG Xuemei XING Guangjian FENG Zhenjian he deyan College of Physics Science and Technology Lanzhou 730000China The Key Laboratory of Advanced Functional Materials Ministry of Education China Beijing University of TechnologyBeijing 100022China

The preparation process, structure feature and field electron emission characteristic of diamond films on nanocyrstalline diamond coating by the CVD method were studied. The field electron emission measurements on the samples showed that the diamond films have lower turn-on voltage and higher field emission current density. A further detailed theory explanation to the results was given.

关键词： diamond films MW-CVD field electron emission.

Enhancement of photoelectric performance for CsPbI2Br solar cells by the synergistic effect of binary additives

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Journal of Materiomics 2023年第1期9卷 27-34页

作者： Qiulu Chen Like Lin Yanzhou Wang Zhe Gao Yujun Fu Qiming Liu Junshuai Li deyan he School of Materials and Energy LONGi Institute of Future TechnologyLanzhou UniversityLanzhou730000China College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional MaterialsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China

CsPbI_(2)Br-based perovskite solar cells(PSCs)have attracted much attention because of their excellent phase stability and appropriate ***,numerous defects of undercoordinated ions or mobile species are the sites of carrier nonradiative recombination,causing a low power conversion efficiency(PCE).In this work,NaCl and nitrogen-doped graphene quantum dots(N-GQDs)as binary additives are introduced into perovskite precursor to obtain high-quality photoactive *** ion(Cl^(-))is incorporated into perovskite due to the same physical and chemical properties as bromine(Br^(-)),that align the energy level of CsPbI_(2)Br,decrease the energy barrier between perovskite and P3HT to promote carrier transport and extraction,hence result in the reduced energy ***,because of its good conductivity,N-GQDs at grain boundaries can rapidly conduct photogenerated electrons to SnO_(2),suppressing carrier recombination at grain ***,the trap state density of the CsPbI_(2)Br film with binary additives is reduced,which could prolong the carrier lifetime,and improve surface *** a result,a PCE of 15.37%for CsPbI_(2)Br PSCs with binary additives is obtained,which shows~22.76%relative increment compare with the pristine ***,a simple and convenient optimization strategy of binary additives for PSCs is proposed in this work.

关键词： All-inorganic perovskite solar cells Synergistic effect Carrier transport Binary additives engineering