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Ultrathin lead-free double perovskite cesium silver bismuth bromide nanosheets

Nano Research 2021年第11期14卷 4079-4086页

作者： Jianmei Huang Shengwen Zou Jia Lin Zhiwei Liu Mingjing Qi School of Energy and Power Engineering Beihang UniversityBeijing100191China Department of Physics Shanghai University of Electric PowerShanghai200090China

Two-dimensional (2D) lead halide perovskites nanostructures have drawn great fundamental interest and displayed excellent properties for various optoelectronic applications. However, the toxicity of lead remains a concern for their large-scale utilizations. Bismuth halide double perovskites stand out as a class of promising candidates for lead-free halide perovskites. In this work, we demonstrate the first synthesis of lead-free 2D halide double perovskite nanosheets. The synthesized Cs2AgBiBr6 nanosheets exhibited thicknesses in the range of 3–5 nm and lateral dimensions of ∼ 200 nm. The nanosheets showed a strong absorption peak centered at ∼ 430 nm and the photoluminescence emission observed at ∼ 630 nm. We also explored dimensionality control from zero-dimensional nanocubes to 2D nanosheets and investigated the preferential growth of Cs2AgBiBr6 over other related compounds such as Cs3Bi2Br9 and CsAgBr2. Our study reveals that Cs2AgBiBr6 nanosheets are interesting 2D material for potential optoelectronic applications and provides a guideline for the controllable synthesis of multi-component compounds with tunable morphology, dimensionality and phase.

关键词： inorganic halide perovskites double perovskites nanocrystals bismuth based two-dimensional nanostructures

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The stability of inorganic perovskite solar cells:from materials to devices

Materials Futures

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Materials Futures 2023年第3期2卷 21-37页

作者： Bingcheng Yu Shan Tan Dongmei Li Qingbo Meng Beijing National Laboratory for Condensed Matter Physics Renewable Energy LaboratoryInstitute of PhysicsChinese Academy of Sciences(CAS)Beijing 100190People’s Republic of China Huairou Division Institute of PhysicsChinese Academy of SciencesBeijing 101407People’s Republic of China College of Materials Science and Opto-Electronic Technology University Chinese Academy of SciencesBeijing 100049People’s Republic of China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Songshan Lake Materials Laboratory DongguanGuangdong 523808People’s Republic of China

inorganic halide perovskite solar cells(IHPSCs)have become one of the most promising research hotspots due to to the excellent light and thermal stabilities of inorganic halide perovskites(IHPs).Despite rapid progress in cell performance in very recent years,the phase instability of IHPs easily occurs,which will remarkably influence the cell efficiency and *** effort has been devoted to solving this *** this review,we focus on representative progress in the stability from IHPs to IHPSCs,including(i)a brief introduction of inorganic perovskite materials and devices,(ii)some new additives and fabrication methods,(iii)thermal and light stabilities,(iv)tailoring phase stability,(v)optimization of the stability of inorganic perovskite solar cells and(vi)interfacial engineering for stability ***,perspectives will be given regarding future work on highly efficient and stable *** review aims to provide a thorough understanding of the key influential factors on the stability of materials to highly efficient and stable IHPSCs.

关键词： inorganic halide perovskites inorganic halide perovskite solar cells light stability thermal stability phase instability

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