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Spontaneous morphology reconfiguration of luminescent CH3NH3PbBr3 perovskites from monodispersed nanocrystals to discontinuous rings by dewetting-triggered solute migration

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Abstract

Morphology engineering is vital for tuning electronic and optical properties of perovskite nanocrystals (NCs). Though many 1D, 2D and 3D perovskite NCs have been prepared, perovskite rings are not reported. This work reported the preparation of perovskite rings by a simple method of dewetting perovskite NCs solution on the glass slide. Our results indicate that perovskites NCs can change their morphology from the starting nano-sized spherical shape to intermediate molecules/ions and finally to micron-sized perovskite rings during the dewetting process. The alteration of NCs–molecules–rings is driven by the dewetting-induced alteration of solvent environment for perovskite from the initial insoluble mixture of N,N-dimethylformamide (DMF) and toluene (1:50 v/v), to intermediate soluble DMF and finally to the glass slide without solvent. During the decomposing process from starting NCs to molecules/ions, the original oleic acid ligands of perovskite NCs will be released. These oleic acid surfactants will form ligand-stabilized gas bubbles, which act as in situ templates for reshaping of perovskite ring shape from molecules/ions.

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Acknowledgements

We thank prof. Xuhao Hong in Nanjing University for ESEM and mapping measurements. This work is supported by National Natural Science Foundation of China (Grant Nos. 61875037, 21875034, 61475034), the Fundamental Research Funds for the Central Universities (Grant No. 2242018K41019). Funding was provided by National Key Basic Research Program of China (2015CB352002).

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  1. Xiang Wang and Shuhong Xu have contributed equally to this work.

Authors and Affiliations

  1. Advanced Photonics Center, Southeast University, Nanjing, 210096, People’s Republic of China

    Xiang Wang, Shuhong Xu, Chunlei Wang, Xiaoyue Jiang, Changgui Lu, Shenfei Zong, Zhuyuan Wang & Yiping Cui

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  1. Xiang Wang
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  2. Shuhong Xu
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  3. Chunlei Wang
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Correspondence to Chunlei Wang.

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Wang, X., Xu, S., Wang, C. et al. Spontaneous morphology reconfiguration of luminescent CH3NH3PbBr3 perovskites from monodispersed nanocrystals to discontinuous rings by dewetting-triggered solute migration. J Mater Sci 54, 1248–1254 (2019). https://doi.org/10.1007/s10853-018-2935-7

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