[2P01-29] Poster session

[2P30] Thickness-dependent surface structures of ultrathin Cs–Br and Pb–Br films on Ag(111)

*Kota Tsuboi¹, Junji Yuhara¹ (1. Graduate School of Engineering, Nagoya University (Japan))

All-inorganic perovskites exhibit excellent optical performance and strong stability, making them promising for photovoltaic applications. Ultrathin CsPbBr₃ films can be prepared by co-depositing PbBr₂ and CsBr through MBE, which also enables atomic-scale analysis of surface structures. In this study, ultrathin PbBr₂ and CsBr films were deposited on Ag(111) via MBE to investigate their surface structure. For the PbBr₂ films, LEED patterns showed (√3×√3)R30° and (1.18×1.18)R4.5° spots with multi-domain diffraction features. These characteristic features are suggested to be unique to ultrathin PbBr₂ films on Ag(111). Conversely, for the ultrathin CsBr films, a twofold-symmetric periodic structure was observed at low coverage, and transformed into a threefold-symmetric periodic structure as the film thickness increased. These results indicate that the growth mode and surface periodicity of ultrathin PbBr₂ and CsBr films on Ag(111) depend strongly on the amount deposited, offering valuable insights into the initial growth process of CsPbBr₃ films.

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