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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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Recurrent hardgrounds and their significance for intra-basinal correlations:a case study of upper Bathonian rocks from the western margin of the Indian craton

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Journal of Palaeogeography 2019年第1期8卷 19-30页

作者： Dhirendra K.Pandey Franz T.Fürsich Matthias Alberti Jitendra K.Sharma narendra Swami Earth and Planetary Sciences Group Manipal Center for Natural SciencesCentre of Excellence Dr. TMA Pai Planetarium Building Manipal Academy of Higher Education FG Pal?oumwelt GeoZentrum Nordbayern Friedrich-Alexander Universit?t Erlangen-Nürnberg Institut für Geowissenschaften Christian-Albrechts-Universit?t zu Kiel Department of Geology University of Rajasthan Himalayan Geology Division Geological Survey of India Northern Region

A set of two to three prominent hardgrounds can be traced for more than 40 km from east to west within the Jurassic succession of the Jaisalmer Basin at the western margin of the Indian Craton. The hardgrounds started to form under subtidal conditions in a mixed carbonate–siliciclastic setting during the last phase of a transgressive systems tract, i.e. the maximum flooding zone. The age difference between the hardgrounds is very small, but they differ lithologically. Typically, the stratigraphically oldest hardground occurs at the top of a 1-m-thick calcareous sandstone. It is characterized by a spectacular megaripple surface encrusted with oysters and subsequently occasionally bored by bivalves. The hardground is overlain by 10–25 cm of biowackestone to biopackstone, at the top of which another hardground is developed. This second hardground is characterized by abundant bivalve(Gastrochaenolites isp.) and "worm" borings(Trypanites and Meandropolydora isp.) and occasional oyster encrustations. The third hardground can be found within the overlying 60-cm-thick, bioturbated, fossiliferous silty marly packstone. It shows common to abundant oyster encrustations and occasional borings together with reworked concretions. The individual hardground can be well recognized throughout the basin based on lithology and biotic components. The second hardground(biowackestone to biopackstone) with abundant bivalve and worm borings is most prominent and widespread. Lithostratigraphically, these three hardground surfaces belong to the uppermost part of the Bada Bag Member of the Jaisalmer Formation. Based on ammonites, such as Perisphinctes congener(Waagen), brachiopods, and corals, this interval of the Bada Bag Member has been assigned a late Bathonian age. The entire succession above the first hardground is bioturbated up to the overlying marly silt of the Kuldhar Member of the Jaisalmer Formation, which is already Callovian in age. The characteristic hardground lithologies, toget

关键词： Hardgrounds Stratigraphy Palaeoenvironment Jurassic Jaisalmer Basin

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