Growth mode and molecular orientation of phthalocyanine molecules on metal single crystal substrates: A NEXAFS and XPS study

• DOI: 10.1016/j.susc.2005.12.042
• Publication Date: 2006-01-24T09:14:55Z
• Authors: S. Kera; M.B. Casu; K.R. Bauchspieß; D. Batchelor; Th. Schmidt; E. Umbach
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract We report on near-edge X-ray absorption and X-ray photoemission experiments for the large π-conjugated organic molecule metal-free phthalocyanine (H 2 Pc) on two different single crystal surfaces. Results from H 2 Pc deposited on Ag(1 1 1) at 300 K show a clear linear dichroism indicating that the film grows as islands with the molecules lying essentially flat. On a Ni 3 Al(1 1 1) and a cooled Ag(1 1 1) substrate, however, the molecules form a homogeneous film and have an average tilt angle of 45–60°. The different film structure is the result of a different molecule–substrate interaction.