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Organolead Halide Perovskite Nanocrystals: Branched Capping Ligands Control Crystal Size and Stability.

  • Author(s): Luo, Binbin;
  • Pu, Ying-Chih;
  • Lindley, Sarah A;
  • Yang, Yi;
  • Lu, Liqiang;
  • Li, Yat;
  • Li, Xueming;
  • Zhang, Jin Z
  • et al.

CH3 NH3 PbBr3 perovskite nanocrystals (PNCs) of different sizes (ca. 2.5-100 nm) with high photoluminescence (PL) quantum yield (QY; ca. 15-55 %) and product yield have been synthesized using the branched molecules, APTES and NH2 -POSS, as capping ligands. These ligands are sterically hindered, resulting in a uniform size of PNCs. The different capping effects resulting from branched versus straight-chain capping ligands were compared and a possible mechanism proposed to explain the dissolution-precipitation process, which affects the growth and aggregation of PNCs, and thereby their overall stability. Unlike conventional PNCs capped with straight-chain ligands, APTES-capped PNCs show high stability in protic solvents as a result of the strong steric hindrance and propensity for hydrolysis of APTES, which prevent such molecules from reaching and reacting with the core of PNCs.

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