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Intermediate phase-enhanced Ostwald ripening for the elimination of phase segregation in efficient inorganic CsPbIBr_(2)perovskite solar cells

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science China Materials 2021年第11期64卷 2655-2666页

作者： Wei Li Benjia Zhu Mathias Uller Rothmann Amelia Liu Weijian Chen Yen Yee Choo Narendra Pai Wenxin Mao Tian Zhang Qiaoliang Bao Xiaoming Wen Udo Bach Joanne Etheridge Yi-Bing Cheng Foshan Xianhu Laboratory of the Advanced Energy science and Technology Guangdong Laboratory Xianhu hydrogen ValleyFoshan 528200China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Physics University of OxfordOxford OX13PUUnited Kingdom school of Physics and Astronomy Monash UniversityVictoria 3800Australia Centre for Micro-Photonics Swinburne University of TechnologyHawthorn 3122Australia Australian Research Council Centre of Excellence in Exciton science Monash UniversityVictoria 3800Australia Department of Materials science and engineering Monash UniversityVictoria 3800Australia Department of Chemical engineering Monash UniversityVictoria 3800Australia Commonwealth Scientific and Industrial Research Organization Manufacturing FlagshipClaytonVictoria 3168Australia Melbourne Centre for Nano fabrication 151 Wellington RoadClaytonVIC 3168Australia Monash Centre for Electron Microscopy Monash UniversityVictoria 3800Australia

Mixed halide perovskites with the ability to tune bandgaps exhibit attractive applications in tandem solar cells,building integrated photovoltaic and wavelength-tunable light-emitting ***,halide demixing under illumination or in the dark with a charge-carrier injection in both hybrid and inorganic perovskites results in bandgap instability and current-density-voltage(J-V)hysteresis,which can significantly hamper their ***,we demonstrate that halide segregation and J-V hysteresis in mixed halide inorganic CsPbIBr_(2)solar cells can be effectively mitigated by introducing an intermediate phase-enhanced Ostwald ripening through the control of the chemical composition in the CsPbIBr_(2)precursor *** amounts of either PbBr_(2)or CsI are incorporated into originally even molar amounts of PbBr_(2)and CsI precursor *** the PbBr_(2)-excess,we observed an enlarged perovskite grain size,no detectable halide phase segregation at the grain boundaries nor the perovskite/TiO2 interface,an increased minority carrier lifetime,a reduced J-V hysteresis,and an improved solar-cell ***,different CsI:PbBr_(2)stoichiometric ratios were found to have different effects on the performance of the perovskite solar *** excessive lead phase is reactive with the dimethyl sulfoxide(DMSO)in the precursor solution to form the Pb(I,Br)2·DMSO complex and the quasi-twodimensional(2D)CsPb_(2)(I,Br)5,which are conducive to Ostwald maturation and defect ***,the CsPbIBr_(2)solar cell with a PbBr_(2)-excess precursor composition reaches a power conversion efficiency(PCE)of 9.37%(stabilized PCE of 8.48%)and a maximum external quantum efficiency of over 90%.

关键词： solar cells phase segregation CsPbIBr_(2) cathodoluminescence transmission electron microscope

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An Autonomous Navigation Methodology for a Pioneer 3DX Robot

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computer Technology and Application 2014年第2期5卷 91-97页

作者： Salvador Ibarra Martinez Jose Antonio Castan Rocha Julio Laria Menchaca Mayra Guadalupe Trevino Berrones Javier Guzman Obando Julissa Perez Cobos Emilio Castan Rocha computer science Department Engineering School Autonomous University of Tamaulipas Victoria Tamaulipas 87000 Mexico. Electrical and Electronic Department Technological Institute of Madero City Tampico Tamaulipas 89440 Mexico.

Autonomous navigation is a complex challenge that involves the interpretation and analysis of information about the scenario to facilitate the cognitive processes of a robot to perform free trajectories in dynamic environments. To solve this, the paper introduces a Case-Based Reasoning methodology to endow robots with an efficient decision structure aiming of selecting the best maneuver to avoid collisions. In particular, Manhattan Distance was implemented to perform the retrieval process in CBR method. Four scenarios were depicted to run a set of experiments in order to validate the functionality of the implemented work. Finally, conclusions emphasize the advantages of CBR methodology to perform autonomous navigation in unknown and uncertain environments.

关键词： Autonomous navigation pioneer 3DX robot CBR methodology.

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Electrospinning as a route to advanced carbon fibre materials for selected low-temperature electrochemical devices:A review

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Journal of Energy Chemistry 2021年第8期30卷 492-529,I0011页

作者： Yue Wen Matt D.R.Kok Jorge Pavel victoria Tafoya Ana BJorge Sobrido Ellsworth Bell Jeff T.Gostick Servann Herou Philipp Schlee Maria-Magdalena Titirici Dan J.L.Brett Paul R.Shearing Rhodri Jervis The Electrochemical Innovation Lab Dept.of Chemical EngineeringUniversity College LondonTorrington PlaceWC1E 7JE LondonUK Queen Mary university of London School of Engineering and Materials ScienceMile End RoadE14NS LondonUK Department of Chemical engineering University of WaterlooWaterlooCanada Department of Chemical engineering Imperial College LondonSouth Kensington CampusSW72AZ LondonUK

Electrospinning has been proven as a highly versatile fabrication method for producing nano-structured fibres with controllable morphology,of both the fibres themselves and the void structure of the ***,it is possible to use heteroatom doped polymers or to include catalytic precursors in the electrospinning solution to control the surface properties of the *** factors make it an ideal method for the production of electrodes and flow media for a variety of electrochemical devices,enabling reduction in mass transport and activation overpotentials and therefore increasing ***,the use of biomass as a polymer source has recently gained attention for the ability to embed sustainable principles in the materials of electrochemical devices,complementing their ability to allow an increase in the use of renewable electricity via their *** this review,the historical and recent developments of electrospun materials for application in redox flow batteries,fuel cells,metal air batteries and supercapacitors are thoroughly reviewed,including an overview of the electrospinning process and a guide to best ***,we provide an outlook for the emerging use of this process in the field of electrochemical energy devices with the hope that the combination of tailored microstructure,surface functionality and computer modelling will herald a new era of bespoke functional materials that can significantly improve the performance of the devices in which they are used.

关键词： Electrospinning Redox flow batteries Fuel cells Metal-air batteries Supercapacitors

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The optimization of replica distribution in the unstructured overlays

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science China(Information sciences) 2012年第3期55卷 714-722页

作者： FENG GuoFu1,2 , LI WenZhong2, LU SangLu2, CHEN DaoXu2 & BUYYA Rajkumar3 1school of Information science, Nanjing Audit university, Nanjing 210029, China 2State Key Laboratory of Novel Software Technology, Nanjing university, Nanjing 210093, China 3Department of computer science and Software engineering, The university of Melbourne, victoria 3010, Australia school of Information science Nanjing Audit University State Key Laboratory of Novel Software Technology Nanjing University

Replication is a widely used technique in unstructured overlays to improve content availability or system performance. A fundamental question often addressed by previous work focused on: how many replicas ought to be allocated for each data item given the fixed query rates and limited storage capability? In this paper, we have put forth two optimal replica distributions to achieve the highest success rate and the lowest message consumption. Especially, we have investigated the influence of item size on replica distribution. Our results show that Square-Root Replication, which is traditionally considered to be optimal, is not always the best choice. Our study offers a new deep understanding of resource managment in self-organized unstructured overlays.

关键词： unstructured overlay item size distribution query rate success rate expected search size

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High-quality-factor optical microresonators fabricated on lithium niobate thin film with an electro-optical tuning range spanning over one free spectral range [Invited]

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Chinese Optics Letters 2021年第6期19卷 3-7页

作者： Zhe Wang Chaohua Wu Zhiwei Fang Min Wang Jintian Lin Rongbo Wu Jianhao Zhang Jianping Yu Miao Wu Wei Chu Tao Lu Gang Chen Ya Cheng State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser science Shanghai Institute of Optics and Fine Mechanics(SIOM)Chinese Academy of Sciences(CAS)Shanghai 201800China Center of Materials science and Optoelectronics engineering University of Chinese Academy of SciencesBeijing 100049China school of Physical science and Technology ShanghaiTech UniversityShanghai 200031China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China The Extreme Optoelectromechanics Laboratory(XXL) School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Department of Electrical and computer engineering University of VictoriaVictoria BC V8P 5C2Canada

We demonstrate high-quality(intrinsic Q factor∼2.8×106)racetrack microresonators fabricated on lithium niobate thin film with a free spectral range(FSR)of∼86 *** integrating microelectrodes alongside the two straight arms of the racetrack resonator,the resonance wavelength around 1550 nm can be red shifted by 92 pm when the electric voltage is raised from−100 V to 100 *** microresonators with the tuning range spanning over a full FSR are fabricated using photolithography assisted chemo-mechanical etching.

关键词： microresonators lithium niobate electro-optical tuning chemo-mechanical etching

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The LBFGS quasi-Newtonian method for molecular modeling prion AGAAAAGA amyloid fibrils

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Natural science 2012年第12期4卷 1097-1108页

作者： Jiapu Zhang Yating Hou Yiju Wang Changyu Wang Xiangsun Zhang Centre for Informatics and Applied Optimization & Graduate school of sciences Information Technology and Engineering The University of Ballarat Victoria Australia Institute of Applied Mathematics Academia Sinica Beijing China school of Management science Qufu Normal University Rizhao China

Experimental X-ray crystallography, NMR (Nuclear Magnetic Resonance) spectroscopy, dual polarization interferometry, etc. are indeed very powerful tools to determine the 3-Dimensional structure of a protein (including the membrane protein);theoretical mathematical and physical computational approaches can also allow us to obtain a description of the protein 3D structure at a submicroscopic level for some unstable, noncrystalline and insoluble proteins. X-ray crystallography finds the X-ray final structure of a protein, which usually need refinements using theoretical protocols in order to produce a better structure. This means theoretical methods are also important in determinations of protein structures. Optimization is always needed in the computer-aided drug design, structure-based drug design, molecular dynamics, and quantum and molecular mechanics. This paper introduces some optimization algorithms used in these research fields and presents a new theoretical computational method—an improved LBFGS Quasi-Newtonian mathematical optimization method—to produce 3D structures of prion AGAAAAGA amyloid fibrils (which are unstable, noncrystalline and insoluble), from the potential energy minimization point of view. Because the NMR or X-ray structure of the hydrophobic region AGAAAAGA of prion proteins has not yet been determined, the model constructed by this paper can be used as a reference for experimental studies on this region, and may be useful in furthering the goals of medicinal chemistry in this field.

关键词： Protein 3D Structure Computational Approaches Optimization Method Molecular Modelling Prion AGAAAAGA Amyloid Fibrils

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Beyond Lambertian light trapping for large-area silicon solar cells:fabrication methods

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Opto-Electronic Advances 2022年第9期5卷 14-25页

作者： Jovan Maksimovic Jingwen Hu Soon Hock Ng Tomas Katkus Gediminas Seniutinas Tatiana Pinedo Rivera Michael Stuiber Yoshiaki Nishijima Sajeev John Saulius Juodkazis Optical sciences Centre and ARC Training Centre in Surface engineering for Advanced Materials(SEAM) School of ScienceSwinburne University of TechnologyHawthorn Vic 3122Australia Melbourne Centre for Nanofabrication ANFF Victoria151 Wellington Rd.Clayton Vic 3168 Australia Department of Electrical and computer engineering Graduate School of EngineeringYokohama National University79-5 TokiwadaiHodogaya-kuYokohama 240-8501Japan Institute of Advanced sciences Yokohama National University79-5 TokiwadaiHodogaya-kuYokohama 240-8501Japan Department of Physics University of Toronto60 St.George StreetTorontoONM5S 1A7Canada World Research Hub Initiative(WRHI) School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

Light trapping photonic crystal(PhC)patterns on the surface of Si solar cells provides a novel opportunity to approach the theoretical efficiency limit of 32.3%,for light-to-electrical power conversion with a single junction *** is beyond the efficiency limit implied by the Lambertian limit of ray trapping~29%.The interference and slow light effects are harnessed for collecting light even at the long wavelengths near the Si *** compare two different methods for surface patterning,that can be extended to large area surface patterning:1)laser direct write and 2)step-&-repeat 5×reduction projection *** area throughput limitations of these methods are compared with the established elec-tron beam lithography(EBL)route,which is conventionally utilised but much slower than the presented ***-tral characterisation of the PhC light trapping is compared for samples fabricated by different *** of Si etched via laser patterned mask was~7%at visible wavelengths and was comparable with Si patterned via EBL made *** later pattern showed a stronger absorbance than the Lambertian limit6.

关键词： silicon solar cells laser ablation light trapping Lambertian limit

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Electro-optic tuning of a single-frequencyultranarrow linewidth microdisk laser

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Advanced Photonics 2022年第3期4卷 105-113页

作者： Jintian Lin Saeed Farajollahi Zhiwei Fang Ni Yao Renhong Gao Jianglin Guan Li Deng Tao Lu Min Wang Haisu Zhang Wei Fang Lingling Qiao Ya Cheng Chinese Academy of sciences(CAS) Shanghai Institute of Optics and Fine Mechanics(SIOM)State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-Intense Laser ScienceShanghaiChina university of Chinese Academy of sciences Center of Materials Science and Optoelectronics EngineeringBeijingChina university of victoria Department of Electrical and Computer EngineeringVictoriaBritish ColumbiaCanada East China Normal university School of Physics and Electronic ScienceXXL—The Extreme Optoelectromechanics LaboratoryShanghaiChina Research Center for Intelligent Sensing Zhejiang LabHangzhouChina Zhejiang university College of Optical Science and EngineeringThe Interdisciplinary Center for Quantum InformationState Key Laboratory of Modern Optical InstrumentationHangzhouChina East China Normal university State Key Laboratory of Precision SpectroscopyShanghaiChina Jiaxing Institute of Zhejiang university Intelligent Optics&Photonics Research CenterJiaxingChina Shanxi university Collaborative Innovation Center of Extreme OpticsTaiyuanChina Shandong Normal university Collaborative Innovation Center of Light Manipulations and ApplicationsJinanChina Shanghai Research Center for Quantum sciences Shang

Single-frequency ultranarrow linewidth on-chip microlasers with a fast wavelength tunability play a game-changing role in a broad spectrum of applications ranging from coherent communication,light detection and ranging,to metrology and *** and fabrication of such light sources remain a challenge due to the difficulties in making a laser cavity that has an ultrahigh optical quality(Q)factor and supports only a single lasing frequency ***,we demonstrate a unique single-frequency ultranarrow linewidth lasing mechanism on an erbium ion-doped lithium niobate(LN)microdisk through simultaneous excitation of high-Q polygon modes at both pump and laser *** the polygon modes are sparse within the optical gain bandwidth compared with the whispering gallery mode counterpart,while their Q factors(above 10 million)are even higher due to the significantly reduced scattering on their propagation paths,single-frequency lasing with a linewidth as narrow as 322 Hz is *** measured linewidth is three orders of magnitude narrower than the previous record in on-chip LN ***,enabled by the strong linear electro-optic effect of LN,real-time electro-optical tuning of the microlaser with a high tuning efficiency of∼50 pm∕100 V is demonstrated.

关键词： lasers lithium niobate microcavities integrated opti

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从四方到立方:高性能太阳能电池的钙钛矿相结构演变

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science Bulletin 2023年第2期68卷 141-145,M0003页

作者：魏旗梁昊 Yuki Haruta Makhsud Saidaminov 米启兮 Michael Saliba 崔光磊宁志军 school of Physical science and Technology ShanghaiTech UniversityShanghai 201210China High Performance Computing Department National Supercomputing Center in ShenzhenShenzhen 200441China Department of Chemistry and Department of Electrical&computer engineering and Centre for Advanced Materials and Related Technologies(CAMTEC) University of VictoriaVictoria V8P 5C2Canada Institute for Photovoltaics University of StuttgartStuttgart 70569Germany Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China

Crystal structure, which is generally determined by the composition, ionic radius and valence state of constituent elements, plays a significant role in the material’s fundamental properties such as optical, electronic, and mechanical characters. The manipulation of the crystal structure through compositional engineering, and understanding the relationship between crystal structure and properties are essential for the development of materials.

关键词：太阳能电池结构演变钙钛矿相

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Avoidance of Cross-Tier Interference from Open Access Femtocells to Macrocell Users

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通讯和计算机（中英文版） 2012年第8期9卷 929-941页

作者： Shahryar Saleem Horace King school of engineering and science Victoria University Melbourne Victoria 8001 Australia

Cross-tier interference can have severe impacts on the overall macrocell capacity. Avoiding such interference is very important for the co-existence of femtocells within a macrocell. In this paper, we use simple handover strategy between the macrocell and the femtocell to alleviate the problem of cross-tier interference from open access femtocells. The handover to an interfering femtocell is performed only when the femtocell contains unutilised resources having very little or no level of downlink interference to serve the macrocell user. In order to deal with the problem of increased number of handovers associated with the open access femtocells, a timer with a minimum and a maximum value is proposed in every macrocell user. The macrocell user measures the RSS (received signal strength) from the nearby interfering femtocells, and starts the timer from 0 to the minimum value as soon as the RSS from the femtocells become greater than the RSS from the macrocell. Once the timer expires, the macrocell user checks the RSS from the interfering femtocells. If the RSS from the interfering femtocells is still high, the macrocell user again starts the timer from 0 to the maximum value. After the timer expires, the macrocell user again checks the RSS from the interfering femtocells. If the RSS is high, the macrocell user requests a handover. However, if the RSS from the interfering femtocells is low, no handover request is made. The efficiency of the proposed timer can be seen from the simulation results.

关键词：下行链路干扰微蜂窝基站用户服务宏单元跨层切换策略微微蜂窝 RSS

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