检索结果-南通市图书馆

Brightening thiocyanate-anion layered perovskite through internal stress modulated nano phase segregation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第4期16卷 5533-5540页

作者： Yiming Li Jiangjian Shi Huijue Wu Yanhong Luo Dongmei Li Qingbo Meng Key Laboratory for Renewable Energy Chinese Academy of SciencesBeijing Key Laboratory for New Energy Materials and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Huairou Division Institute of PhysicsChinese Academy of SciencesBeijing 101400China Songshan Lake Materials Laboratory Dongguan 523808China

Thiocyanate-anion(SCN−)two-dimensional(2D)layered perovskite with internal stress-controlled nano phase segregation has been firstly demonstrated as a promising material system for luminescence *** interesting energy band structure is found as well as charge transfer process caused by nano phase segregation,which provide an alternative route to overcome the indirect-bandgap luminescence limit of SCN layered *** is revealed that,within the SCN layered framework,the segregated nano phases exist in a quantum well form,possessing much higher carrier localization and second-order radiative recombination *** the help of internal stress modulation,these advantages can be significantly enhanced and finally contribute to high luminescence performances in visible-red *** work provides more potential opportunities for 2D layered perovskite materials in the future optoelectronic applications.

关键词： two-dimensional perovskite internal stress thiocyanate anion phase segregation luminescence

Nonlinear current-voltage characteristics originated from phase segregation and micro-cracks in polycrystalline La_(0.67)Ba_(0.33)MnO_3

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2011年第7期29卷 716-718页

作者：崔益民刘伟潘晖 Key Laboratory of Micro-Nano Measurement-Manipulation and Physics (Ministry of Education) and Department of Physics Beijing University of Aeronautics and As-tronautics

Polycrystalline La0.67Ba0.33MnO3 bulk samples were annealed in flowing 95%Ar：5%H2 （AH） mixed gas at 973 K for different time respectively. The influence of the annealing time on the current-voltage properties was systematically investigated. Linear current-voltage characteristics were observed in the as-prepared and the 10 h annealed samples, and nonlinear current-voltage characteristics was found in the 100 h annealed sample. At the same time, segregation of impurity phase and micro-cracks were found on the surfaces of the 100 h annealed samples, which was testified to be Ba ion impurity. Analysis showed that the changes of electronic properties were caused by barium ion im-purities and micro-cracks in the 100 h annealed sample.

关键词： La0.67Ba0.33MnO3 hydrogen annealing phase segregation current-voltage characteristics rare earths

Moisture-Induced Non-Equilibrium phase segregation in Triple Cation Mixed Halide Perovskite Monitored by In Situ Characterization Techniques and Solid-State NMR

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2023年第2期6卷 185-194页

作者： Mohammad Ali Akhavan Kazemi Nicolas Folastre Parth Raval Michel Sliwa Jean Marie Vianney Nsanzimana Sema Golonu Arnaud Demortiere Jean Rousset Olivier Lafon Laurent Delevoye G.N.Manjunatha Reddy Frédéric Sauvage Laboratoire de Réactivité et Chimie des Solides(LRCS) UMR CNRS 7314-Institut de Chimie de Picardie FR 3085Université de Picardie Jules Verne33 rue Saint LeuAmiens Cedex FR-80039France CNRS Centrale LilleUMR 8181UCCSUnitéde Catalyse et Chimie du SolideUniversité de LilleUniversitéd’ArtoisLille F-59000France UMR 8516-LASIRE-Laboratoire de Spectroscopie pour les Interactions la Réactivité et l’EnvironnementCNRSUniversitéde LilleLille F-59000France EDF R&D EDF LabBoulevard Gaspard MongePalaiseau 91120France

Environmental stability is a major bottleneck of perovskite solar *** a handful of studies are investigating the effect of moisture on the structural degradation of the *** mostly rely on ex situ experiments and on completely degraded samples,which restrict the assessment on initial and final *** combining in situ X-ray diffraction under controlled 85%relative humidity,and live observations of the water-induced degradation using liquid-cell transmission electron microscopy,we reveal two competitive degradation paths leading on one hand to the decomposition of state-of-theart mixed cation/anion(Cs_(0.05)(MA_(0.17)FA_(0.83))_(0.95)Pb(Br_(0.17)I_(0.83))_(3)(CsMAFA)into PbI_(2) through a dissolution/recrystallization mechanism and,on the other hand,to a non-equilibrium phase segregation leading to CsPb_(2)Br_(5) and a Cesium-poor/iodide-rich Cs_(0.05)-x(MA_(0.17)FA_(0.83))_(0.95)Pb(Br_(0.17-2y)I_(0.83)+2y)_(3) *** degradation mechanism is corroborated at atomic-scale resolution through solid-state ^(1)H and ^(133)Cs NMR *** to moisture leads to a film containing important heterogeneities in terms of morphology,photoluminescence intensities,and *** results provide new insights and consensus that complex perovskite compositions,though very performant as champion devices,are comparatively metastable,a trait that limits the chances to achieve long-term stability.

关键词： liquid-cell transmission electron microscopy moisture degradation perovskite stability phase segregation solid-state NMR

Preventing inhomogeneous elemental distribution and phase segregation in mixed Pb-Sn inorganic perovskites via incorporating PbS quantum dots

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第2期31卷 179-185页

作者： Tao Zhang Huaxia Ban Qiang Sun Han Pan Haixuan Yu Zhiguo Zhang Xiaoli Zhang Yan Shen Mingkui Wang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina

Inhomogeneous Pb/Sn elemental distribution and the resulted phase segregation in mixed Pb-Sn halide perovskites would result in energy disorder(band structure and phase distribution disorder),which greatly limits their photovoltaic ***,Pb S quantum dot has been synthesized and demonstrated as seeds for modulation crystallization dynamics of the mixed Pb-Sn inorganic perovskites,allowing an enhanced film quality and significantly suppressing phase *** this additive power conversion efficiency of 8%and 6%is obtained under irradiation of full sunlight in planar and mesoporous structured solar cells in combination with CsPb_(0.5) Sn_(0.5)I_(2)Br inorganic perovskite,*** finding reveals exploring the actual Pb/Sn atoms location in perovskite structure and its influence on developing efficient and stable low-bandgap perovskite solar cells.

关键词： Inorganic perovskite phase segregation Optoelectronic material Photovoltaic device

A-site phase segregation in mixed cation perovskite

在线全文

学校读者我要写书评

暂无评论

Materials Reports(Energy) 2021年第4期1卷 3-21页

作者： Lang Liu Jiuzhou Lu Hao Wang Zhenhua Cui Giacomo Giorgi Yang Bai Qi Chen Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications MIIT Key Laboratory for Low-dimensional Quantum Structure and DevicesExperimental Center of Advanced MaterialsSchool of Materials Science&EngineeringBeijing Institute of TechnologyBeijing100081PR China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081PR China Chaotic Matter Science Research Center Department of MaterialsMetallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou341000PR China Beijing Institute of Technology Chongqing Innovation Center Chongqing401120PR China Department of Civil&Environmental Engineering(DICA) Universita degli Studi di PerugiaVia G.Duranti 9306125PerugiaItaly CNR-SCITEC 06123PerugiaItaly

Mixed cation strategy greatly benefits the enhancement of device performance and chemical ***,adverse impact also accompanies the mixed cation system *** brings the compositional instability,wherein the homogeneous film is likely to segregate into multi-phases during the fabrication and ageing process,thus resulting in the efficiency reduction of perovskite solar cells(PSCs)*** review focuses on the cation induced phase segregation,and elucidates the segregation mechanisms from the perspectives of film formation and ageing process,***,the influence of cation segregation on device performance and operational stability are *** based on these understandings,viable strategies are proposed for the design of phase-stable mixed composition halide perovskites and for suppressing segregation to benefit its development towards commercial applications.

关键词： Photovoltaic Perovskite Mixed cation phase segregation Stability

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

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

同方期刊数据库

Water induced phase segregation in hydrocarbon proton exchange membranes

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2018年第6期27卷 1517-1520页

作者： Kangjie Lyu Yanqiu Peng Li Xiao Juntao Lu Lin Zhuang College of Chemistry and Molecular Sciences Hubei Key Lab of Electrochemical Power Sources Wuhan University Wuhan 430072 Hubei China Institute for Advanced Studies Wuhan University Wuhan 430072 Hubei China

Proton exchange membranes （PEMs） are a key material for proton exchange membrane fuel cells （PEM-FCs）, Non-fluorinated hydrocarbon PEMs are low-cost alternatives to Nation, but limited by the low pro-ton conductivity, because of the weak phase segregation structure and narrow ion-transport *** efforts have been taken to improve the performance of hydrocarbon PEMs, but mostly with com-plex methodologies. Here we demonstrate a simple, yet very efficient method to create phase segrega-tion structure inside a typical hydrocarbon PEM, sulfonated poly（ether ether ketone）（SPEEK）. By sim-ply adding appropriate amounts of water into the DMF solvent, the resulting SPEEK membrane exhibitswidened ion-transport channels, with the phase size of 2.7 nm, as indicated by both molecular dynamic（MD） simulations and transmission electron microscope （TEM） observations, and the proton conductivityis thus improved by 200%. These findings not only further our fundamental understanding of hydrocarbonPEMs, but are also valuable to the development of low-cost and practical fuel cell technologies.

关键词： Proton exchange membrane phase segregation Proton conductivity Molecular dynamics simulation Sulfonated poly(ether ether ketonel

Relationship between Localization of PBSU in Interlamellar/Interfibrillar Regimes and Double Peaks in DSC/SAXS in its Blend with PVDF

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第6期40卷 631-641页

作者： Jia-Yao Wang Yong-Jin Li Ji-Chun You Feng-Gang Bian Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China College of Material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of EducationHangzhou Normal UniversityHangzhou 311121China

In this work,phase segregation and localization of PBSU have been investigated with the combination of SAXS and DSC in its blend with *** stepwise crystallization of PVDF and PBSU,there are double melting peaks of PBSU in DSC and double scattering peaks in *** has been demonstrated that double peaks can be attributed to the localization of PBSU in interlamellar/interfibrillar region in pre-formed PVDF crystal *** the case of low content of PBSU in blend,PBSU is trapped into the interlamellar region of PVDF crystals,resulting in the alternating lamellae crystal of them and the first peak(with low-q)in *** enhanced confinement effect produces thinner PBSU lamellae,corresponding to the lower melting temperature in *** increasing its content in blend,some PBSU segregates in interfibrillar regions in addition to the enrichment in interlamellar regions of PVDF crystal *** larger space and higher concentration of PBSU in interfibrillarregions contribute to periodic lamellae structure of PBSU with higher thickness,which is the reason for the second peak(with high-q)in SAXS and *** results not only clarify the relationship between localization of PBSU in interlamellar/interfibrillar regions and double peaks in DSC/SAXS,but also provide a novel strategy to detect the interlamellar and interfibrillar segregation of low-T_(m) component in miscible crystalline/crystalline blend.

关键词： phase segregation Localization Double peaks DSC/SAXS

Stabilization of mixed-halide lead perovskites under light by photothermal effects

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第12期30卷 8-11,I0001页

作者： Juvinch R.Vicente Martin E.Kordesch Jixin Chen Department of Chemistry and Biochemistry Ohio UniversityAthensOH 45701United States Nanoscale and Quantum Phenomena Institute Ohio UniversityAthensOH 45701United States Department of Chemistry University of the Philippines VisayasMiagaoIloilo 5023Philippines Department of Physics and Astronomy Ohio UniversityAthensOH 45701United States

Mixed-halide lead perovskites(MHLPs) are semiconductor materials with bandgaps that are tunable across the visible spectrum and have seen promising applications in photovoltaics and ***, their segregation into phases with enriched halide components, under resonant light illumination and/or electric field, have hindered their practical applications. Herein, we demonstrate the stabilization of the MHLP photoluminescence(PL) peak as a function of their excitation *** effect is associated with the phase segregation of MHLPs and their subsequent remixing by photothermal heating. We conclude that the balance between these opposing processes dictates the equilibrium PL peak of the MHLPs. The findings in this work could serve as a potential approach to obtain MHLP with stable emission peaks under operating conditions.

关键词： Perovskites phase segregation Photothermal Solar cells LEDs