Volume 14 Issue 1
Jan.  2021
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Chinese Optics  > 2021  >  14(1): 77-86.
SUN Zhi-guo, WU Ye, WEI Chang-ting, GENG Dong-ling, LI Xiao-ming, ZENG Hai-bo. Suppressed ion migration in halide perovskite nanocrystals by simultaneous Ni2+ doping and halogen vacancy filling[J]. Chinese Optics, 2021, 14(1): 77-86. doi: 10.37188/CO.2020-0060
Citation: SUN Zhi-guo, WU Ye, WEI Chang-ting, GENG Dong-ling, LI Xiao-ming, ZENG Hai-bo. Suppressed ion migration in halide perovskite nanocrystals by simultaneous Ni2+ doping and halogen vacancy filling[J]. Chinese Optics, 2021, 14(1): 77-86. doi: 10.37188/CO.2020-0060
shu

Suppressed ion migration in halide perovskite nanocrystals by simultaneous Ni2+ doping and halogen vacancy filling

  • 1.

    School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

  • 2.

    Institute of Optoelectronics and Nanomaterials, MIIT Key Laboratory of Advanced Display Materials and Devices, Nanjing University of Science and Technology, Nanjing 210094, China

Funds:  Supported by Young Elite Scientists Sponsorship Program by CAST (No. 2018QNRC001), National Natural Science Foundation of China (No. 61874054, No. 51902160), Natural Science Foundation of Jiangsu Province (No. BK20180489), Fundamental Research Funds for the Central Universities (No. 30918011208), National Natural Science Funds for Distinguished Young Scholar (No. 61725402)
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    Abstract
  • Lead Halide Perovskites(LHPs) are promising candidates for next-generation optoelectronic application. However, defect-induced ion migration causes phase degradation in LHP nanocrystals. Therefore, material stability has become an urgent problem that impedes practical applications. In this paper, we aim to study the influence of doping cations on inhibiting the migration of halogen ions in perovskite nanocrystals. Through the measurement of ion migration activation energy and in-situ high-resolution transmission electron microscope technology, the effect of precursor dopants on the stability of LHPs were analyzed. Firstly, we synthesized two types of LHP nanocrystals with high crystal quality using nickel acetylacetonate and nickel bromide as precursor dopants, respectively. Secondly, the optical properties and component elements of the doped samples were analyzed by absorption-fluorescence spectroscopy, X-ray diffraction, X-ray photoelectron diffraction, and transmission electron microscopy. Finally, the ion migration activation energies of various LHP films were measured using temperature-dependent ion conductivity tests, and the influence of the precursor dopants on the stability of as-synthesized doped LHPs was compared with the results from high-resolution electron microscopy. The results showed that the activation energies of the doped CsPbBr3 samples were significantly improved compared to the intrinsic CsPbBr3 sample (0.07 eV), which were determined to be 0.238 eV for nickel acetylacetonate and 0.487 eV for nickel bromide. In addition, the electron irradiation experiments showed that the nickel bromide-doped perovskite nanocrystals exhibited higher structural stability. This is due to the strong bonding of doped Ni2+ to halogen and the synergistic passivation effect of halogen filling vacancy defects. It can be concluded that Ni2+ doping and halogen vacancy filling can effectively inhibit ion migration in halide perovskite nanocrystals.

     

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