Phthalocyanine reactivity and interaction on the 6H-SiC(0001)-(3 × 3) surface investigated by core-level experiments and simulations

Autor: Anu Baby, Guillaume Marcaud, Yannick J. Dappe, Marie D’Angelo, Jean-Louis Cantin, Mathieu G. Silly, Guido Fratesi
Přispěvatelé: Università degli Studi di Milano-Bicocca = University of Milano-Bicocca (UNIMIB), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Groupe Modélisation et Théorie (GMT), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Milano = University of Milan (UNIMI), European Project: 654360,H2020,H2020-INFRAIA-2014-2015,NFFA-Europe(2015)
Rok vydání: 2022
Předmět:
Zdroj: Physical Chemistry Chemical Physics
Physical Chemistry Chemical Physics, 2022, 24, pp.14937. ⟨10.1039/d2cp00750a⟩
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN: 1463-9084
1463-9076
Popis: International audience; The adsorption of phthalocyanine (H$_2$ Pc) on the 6H-SiC(0001)-(3 x 3) surface is investigated using X-ray photoelectron spectroscopy (XPS), near edge X-ray absorption fine structure spectroscopy (NEXAFS), and density functional theory (DFT) calculations. Spectral features are tracked from the submonolayer to the multilayer growth regime, observing a significant modification of spectroscopic signals at low coverage with respect to the multilayer films, where molecules are weakly interacting. Molecules stay nearly flat on the surface at the mono and submonolayers. Previously proposed adsorption models, where the molecule binds by two N atoms to corresponding Si adatoms, do not reproduce the experimental spectra at the submonolayer coverage. We find instead that another adsorption model where the molecule replaces the two central H atoms by a Si adatom, effectively forming Si-phthalocyanine (SiPc), is both energetically more stable and yields in combination a better agreement between the experimental and simulated spectra. This suggests that the 6H-SiC(0001)-(3 Â 3) surface may be a candidate substrate for the on-surface synthesis of SiPc molecules.
Databáze: OpenAIRE
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