Quasi one-dimensional iron chains are formed in thermally evaporated iron phthalocyanine thin films on silicon substrates. The chain length is modified by the substrate growth temperature and can be controlled within one order of magnitude. The surface morphology of organic thin films (measured to be 80-90 nm thick) is studied with atomic force microscopy. The grains appear circular at low substrate temperatures but are strongly elongated at high substrate temperatures due to the asymmetric shape of the small molecule. A height-height correlation function is applied to the images and the Hurst function is used to extract the correlation length, roughness, and scaling parameter. It was found that the grain size and correlation length are related by a proportionality factor 3.4. Positive linear correlations were found between the correlation length and substrate temperature during deposition.
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 49/01M, Masters Abstracts International|
|Subjects:||High Temperature Physics, Physics, Molecular physics|
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