Three-dimensional metal-halide perovskites have emerged as promising light harvesting materials for converting sunlight to electricity in the last few years.High power conversion efficiency of 23.3%has been demonstrat...Three-dimensional metal-halide perovskites have emerged as promising light harvesting materials for converting sunlight to electricity in the last few years.High power conversion efficiency of 23.3%has been demonstrated.However,the main challenge that currently limits the application of the perovskite solar cells is the long-term stability,which has ambient,thermal,and photo stability weaknesses.展开更多
The self-assembled metal halide perovskite(MHP)nanocrystal superlattices have attracted many researchers due to their exceptional optical and electrical properties.The bottom-up self-assembly can be facile to generate...The self-assembled metal halide perovskite(MHP)nanocrystal superlattices have attracted many researchers due to their exceptional optical and electrical properties.The bottom-up self-assembly can be facile to generate ideal and periodic structures.The superlattices’stability can be improved and the photoluminescence lifetime can be extended by an order of magnitude.However,due to lack of a comprehensive and systematic understanding of the internal interactions on self-assembled processes now,superlattices cannot be obtained controllably and play full use of their advantages.Therefore,gaining a deep insight of interaction forces about self-assemblies is the premise of designing and controlling the degree of self-assembly so as to prepare ideal materials.In this review,the definitions and functions of driving forces including van der Waals forces,electrostatic interactions and hydrogen bonds are discussed.Subsequently,we aim to explore the dominant factors affecting the driving forces,which can make a difference in the process of MHP self-assembly.Based on current researches,we emphasize on three aspects−the core of nanocrystals,surface ligands and solvents−to clarify their critical roles in controlling the driving forces.Finally,the outlooks and perspectives of how to facilitate the MHP self-assembly and their application on blue light emitting diodes are discussed.展开更多
Combined with the actual project,this paper carries out a nonlinear finite element analysis on 2 groups,6 short-limbed shear walls,through the finite element calculation software ANSYS.The stress-strain relation of th...Combined with the actual project,this paper carries out a nonlinear finite element analysis on 2 groups,6 short-limbed shear walls,through the finite element calculation software ANSYS.The stress-strain relation of the models,and the effects of the type of sections and the axial compression ratios on the models can be obtained,providing a reference for future design.展开更多
基金The authors acknowledge the financial support from Macao Science and Technology Development Funds(FDCT-116/2016/A3,FDCT-091/2017/A2,FDCT-014/2017/AMJ)Research Grants(SRG2016-00087-FST,MYRG2018-00148-IAPME)from University of Macao,the Natural Science Foundation of China(91733302,61605073,2015CB932200)the Young 1000 Talents Global Recruitment Program of China.
文摘Three-dimensional metal-halide perovskites have emerged as promising light harvesting materials for converting sunlight to electricity in the last few years.High power conversion efficiency of 23.3%has been demonstrated.However,the main challenge that currently limits the application of the perovskite solar cells is the long-term stability,which has ambient,thermal,and photo stability weaknesses.
基金financial support from Macao Science and Technology Development Fund(FDCT-116/2016/A3,FDCT-091/2017/A2 and FDCT-014/2017/AMJ)the Research Grants(SRG2016-00087-FST,MYRG2018-00148-IAPME)from University of Macao+1 种基金the National Natural Science Foundation of China(91733302,61605073,61935017)the Natural Science Foundation of Guangdong Province,China(2019A1515012186)。
基金supported by the Foundation of Basic and Applied Basic Research of Guangdong Province(No.2019B1515120087)the Fellowship of China Postdoctoral Science Foundation(No.2021M690723)the Guangdong Basic and Applied Basic Research Foundation(No.2021A1515111222).
文摘The self-assembled metal halide perovskite(MHP)nanocrystal superlattices have attracted many researchers due to their exceptional optical and electrical properties.The bottom-up self-assembly can be facile to generate ideal and periodic structures.The superlattices’stability can be improved and the photoluminescence lifetime can be extended by an order of magnitude.However,due to lack of a comprehensive and systematic understanding of the internal interactions on self-assembled processes now,superlattices cannot be obtained controllably and play full use of their advantages.Therefore,gaining a deep insight of interaction forces about self-assemblies is the premise of designing and controlling the degree of self-assembly so as to prepare ideal materials.In this review,the definitions and functions of driving forces including van der Waals forces,electrostatic interactions and hydrogen bonds are discussed.Subsequently,we aim to explore the dominant factors affecting the driving forces,which can make a difference in the process of MHP self-assembly.Based on current researches,we emphasize on three aspects−the core of nanocrystals,surface ligands and solvents−to clarify their critical roles in controlling the driving forces.Finally,the outlooks and perspectives of how to facilitate the MHP self-assembly and their application on blue light emitting diodes are discussed.
文摘Combined with the actual project,this paper carries out a nonlinear finite element analysis on 2 groups,6 short-limbed shear walls,through the finite element calculation software ANSYS.The stress-strain relation of the models,and the effects of the type of sections and the axial compression ratios on the models can be obtained,providing a reference for future design.
