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Citation: Gang ZHANG, Jian ZHANG, Haiyang CHU, Chongxin QIAN, Lai WEI. Chlorobenzene additive-assisted regulation of (PMA)2PbBr4 crystal growth and photoelectric properties[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(4): 713-721. doi: 10.11862/CJIC.20250318 shu

Chlorobenzene additive-assisted regulation of (PMA)2PbBr4 crystal growth and photoelectric properties

  • Yili Engineering Research Center of Green Silicon⁃based Materials, Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters, College of Physical Science and Technology, Yili Normal University, Yining, Xinjiang 835000, China

  • Corresponding author: Chongxin QIAN, chongxinqian@hotmail.com
  • Received Date: 15 October 2025
    Revised Date: 19 January 2026

Figures(6)

  • To passivate defects in 2D perovskite crystals and improve crystal quality, chlorobenzene was incorporated into the (PMA)2PbBr4 perovskite precursor (PMA+=C6H5CH2NH3+), yielding large, high-quality perovskite single crystals via a cooling-controlled crystallization method. To systematically study the effect of chlorobenzene passivation, (PMA)2PbBr4 crystals were synthesized by cool-controlled crystallization at different concentrations (0.19, 0.38, and 0.47 mol·L-1). The structural, morphological, and optical properties of the perovskite crystals were systematically characterized by using powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and steady-state/time-resolved photoluminescence spectroscopy. The results demonstrate that the addition of chlorobenzene at a concentration of 0.38 mol·L-1 effectively modulates the crystal growth rate, enhances crystallographic orientation, and passivates surface and interface defects, thereby significantly suppressing non-radiative recombination of photogenerated carriers. It effectively passivates surface and interfacial defects, leading to remarkably improved crystal morphology with reduced cracks and enhanced smoothness, as directly observed in SEM and cross-sectional analyses. Furthermore, the chlorobenzene additive can regulate the cationic stacking effect, inducing changes in the microscopic strain of the crystals, which in turn affects electron-phonon coupling and improves the optoelectronic properties. The optimized crystals exhibited a significant increase in the intensities of the dual photoluminescence peaks. Specifically, the low-energy emission peak of the 0.38 mol·L-1 chlorobenzene-passivated crystal showed a red shift and a reduced full width at half maximum, indicating that the chlorobenzene additive effectively alleviates lattice distortion stress both on the surface and within the crystal.
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