All-inorganic dual-phase halide perovskite nanorings
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aborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China Institute of Materials, Ningbo University of Technology, Ningbo 315211, China 3 School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Southern University of Science and Technology, Shenzhen 518055, China 4 School of Material Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia 5 Australian Nuclear Science and Technology Organization, New Illawarra Road, NSW 2234, Australia 2
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 9 March 2020 / Revised: 30 June 2020 / Accepted: 30 June 2020
ABSTRACT In the present work, we report the growth of all-inorganic perovskite nanorings with dual compositional phases of CsPbBr3 and CsPb2Br5 via a facile hot injection process. The self-coiling of CsPbBr3-CsPb2Br5 nanorings is driven by the axial stress generated on the outside surface of the as-synthesized nanobelts, which results from the lattice mismatch during the transformation of CsPbBr3 to CsPb2Br5. The tailored growth of nanorings could be achieved by adjusting the key experimental parameters such as reaction temperature, reaction time and stirring speed during the cooling process. The photoluminescence intensity and quantum yield of nanorings are higher than those of CsPbBr3 nanobelts, accompanied by a narrower full width at half maximum (FWHM), suggesting their high potential for constructing self-assembled optoelectronic nanodevices.
KEYWORDS all-inorganic perovskite, CsPbBr3, CsPb2Pb5, dual-phase, nanorings
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Introduction
Nanomaterial synthesized from bottom up is one timeenduring theme of materials research, and breakthroughs such as quantum dots and nanowires have revolutionized nanoscience and nanotechnology [1–3]. Emergence of novel materials offers fresh opportunities for developing self-assembled synthesis strategies and advancing physical properties and device applications. Recently, lead halide perovskites with an APbX3 stoichiometry (A is MA/FA/Cs, X is Cl/Br/I) have attracted wide attention, owing to their excellent optical and electrical properties, such as large absorption coefficients, high charge carrier lifetime and mobility, tunable bandgap and high photoluminescence (PL) quantum yield (QY) [4–9]. In comparison to the organic–inorganic hybrid counterparts (i.e., MA/FAPbX3), all-inorganic lead halide perovskites (i.e., CsPbX3) possess better stability with comparable photoelectric properties, which has inspired their applications in solar cells, light-emitting diodes (LEDs), photodetectors, lasers, and so on [10–14]. Perovskite nanomaterials have remained quite limited although morphology is recognized as one of the crucially important tuning parameters for exploring novel optoelectronic devices based on low-dimensional perovskites [10, 15–19]. In one pioneering work, one-dimensional (1D) all-inorganic perovskite was reported to poss
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