| 초록 |
Over the past few years, all inorganic cesium lead halide perovskite nanocrystals (CsPbX3 NCs where X=Cl, Br, and/or I) have gained immense attention because of their facile solution synthesis, high PL QY, and outstanding color purity. However instability of CsPbX3 NCs seriously impedes broader utilization of them. Recently stability of CsPbX3 NCs was significantly enhanced by introducing additional metal halides during the synthesis, but the role of the additional metal halides have not been revealed for years. Here, the role of additional metal halides in enhancement of stability is demonstrated for the first time. Because of the surface ligand transition with the presence of additional metal halides, difference in formation energy between (100) and (110) surfaces changes dramatically. Finally the enhanced stability of CsPbX3 NCs is interpreted in the context of suppressed formation of merging-vulnerable (110) surfaces with the presence of additional metal halides. |
