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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Nanostructures at Surfaces (joint session O/CPP)
CPP 16.11: Vortrag
Montag, 27. März 2023, 17:30–17:45, GER 39
Evolution of the Si-Au alloy: from the gold (110) substrate to silicon nanoribbons — •Ekaterina Tikhodeeva1, María E Dávila2, Paola De Padova3, Gay Le Lay4, Marina Baidakova5, Evgeniya Lobanova5, Jaime Sanchez-Barriga6, Dmitrii Smirnov6, and Manuel Izquierdo1 — 1European XFEL, Schenefeld, Germany — 2CSIC, Madrid, Spain — 3Consiglio Nazionale delle Ricerche, Rome, Italy — 4Aix-Marseille Université, Marseille, France — 5Saint Petersburg, Russia — 6Helmholtz-Zentrum Berlin, Berlin, Germany
The development of the Si-Au alloy was investigated on the path from the gold single crystal surface to silicon nanoribbons (SiNR). Si sub-monolayers were deposited on the missing row reconstructed Au(110) substrate. At various stages of evaporation, low-energy electron diffraction (LEED) patterns were recorded to refine the surface geometry. The arrangement of the Si atoms has been correlated with the missing row orientation. The recovery of the Au(1x1) reconstruction, as well as the gradual transition from surface alloy to SiNRs were explored. In parallel with LEED, photoelectron spectroscopy was used to clarify the atom distribution. The profiles of the Au 4f and Si 2p core levels were deconvoluted and analyzed at all stages of Si deposition. The appearance of a new low kinetic energy component was noticed in the Au 4f spectra. It is related to the Si-Au bond and indicates a strong interaction between them. The Si core levels exhibit up to three components corresponding to the different chemical environments.