Abstract
Perovskite MAPbBr3 (MA = CH3NH3+) single crystals were grown via the anti-solvent vapor-assisted crystallization method. The crystal growth process was optimized by adjusting the solution concentration and diluting the anti-solvent. The maximum size of the obtained crystal was 9 × 9 × 3 mm3. It shows that the MAPbBr3 single crystal is a cubic structure, the space group is Pm\( \bar{3} \)m, and the lattice constant is 0.59062 nm. Furthermore, its energy band gap is approximately 2.23 eV. The atomic force microscopy results demonstrated that the growth process of MAPbBr3 single crystal followed the defect step growth mechanism, which was controlled by the screw dislocations within the crystal. Based on the curling growth of a screw dislocation on the crystal surface, a spiral step was formed. After the step was rotated around the entire mesa, a higher step was generated. Repeatedly, the step growth of screw dislocation within the crystal came into being. Besides, some small pits were also observed on (100) plane of the MAPbBr3 crystal. These pits hindered the movement of steps and affected the lattice arrangement around them, causing the structural mismatch and more defects within the crystals.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51502234 and 51602242), the Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2018JM5097) and the Key Laboratory Scientific Research Program of Education Department in Shaanxi Province of China (Grant No. 17JS055).
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Shen, H., Nan, R., Jian, Z. et al. Defect step controlled growth of perovskite MAPbBr3 single crystal. J Mater Sci 54, 11596–11603 (2019). https://doi.org/10.1007/s10853-019-03710-6
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DOI: https://doi.org/10.1007/s10853-019-03710-6