We compare the molecular orientation of differently alkyl-substituted metal phthalocyanines on polycrystalline gold and on single crystalline substrates (Au(100) and GeS(001)). In both cases we observe a high degree of molecular ordering for ultrathin films (1-3 monolayers), the molecules are oriented parallel to the substrate surface (lying). However, the molecular orientation can be different for 5-30 nm thick films: we observe "standing" molecules on relatively ill defined polycrystalline substrate surfaces whereas almost disordered films were found on single crystalline surfaces. The growth mode is discussed in terms of different molecule-molecule and molecule-substrate interactions. (c) 2006 Elsevier B.V. All rights reserved.
Molecular orientation of substituted phthalocyanines: Influence of the substrate roughness / H., Peisert; I., Biswas; L., Zhang; M., Knupfer; M., Hanack; Dini, Danilo; D., Batchelor; T., Chasse. - In: SURFACE SCIENCE. - ISSN 0039-6028. - 600:18(2006), pp. 4024-4029. (Intervento presentato al convegno 23rd European Conference on Surface Science (ECOSS-23) tenutosi a Berlin, GERMANY nel SEP 04-09, 2005) [10.1016/j.susc.2006.02.068].
Molecular orientation of substituted phthalocyanines: Influence of the substrate roughness
DINI, DANILO;
2006
Abstract
We compare the molecular orientation of differently alkyl-substituted metal phthalocyanines on polycrystalline gold and on single crystalline substrates (Au(100) and GeS(001)). In both cases we observe a high degree of molecular ordering for ultrathin films (1-3 monolayers), the molecules are oriented parallel to the substrate surface (lying). However, the molecular orientation can be different for 5-30 nm thick films: we observe "standing" molecules on relatively ill defined polycrystalline substrate surfaces whereas almost disordered films were found on single crystalline surfaces. The growth mode is discussed in terms of different molecule-molecule and molecule-substrate interactions. (c) 2006 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
