Molecular orientation of substituted phthalocyanines: Influence of the substrate roughness

We compare the molecular orientation of differently alkyl-substituted metal phthalocyanines on polycrystalline gold and on single crystalline substrates (Au(1 0 0) and GeS(0 0 1)). In both cases we observe a high degree of molecular ordering for ultrathin films (1–3 monolayers), the molecules are or...

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Published inSurface science Vol. 600; no. 18; pp. 4024 - 4029
Main Authors Peisert, H., Biswas, I., Zhang, L., Knupfer, M., Hanack, M., Dini, D., Batchelor, D., Chassé, T.
Format Journal Article Conference Proceeding
LanguageEnglish
Published Lausanne Elsevier B.V 15.09.2006
Amsterdam Elsevier Science
New York, NY
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science; rheology
CuPc
Exact sciences and technology
NEXAFS
Organic semiconductors
Orientation
Phthalocyanines
Physics
XAS
Organic semiconductors
NEXAFS
XAS
Orientation
CuPc
Phthalocyanines
Molecular orientation
X-ray absorption spectra
Roughness
EXAFS
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Summary:We compare the molecular orientation of differently alkyl-substituted metal phthalocyanines on polycrystalline gold and on single crystalline substrates (Au(1 0 0) and GeS(0 0 1)). 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.
ISSN:0039-6028
1879-2758
DOI:10.1016/j.susc.2006.02.068