Geometric and Electronic Structure of Templated C60 on Diindenoperylene Thin Films

• Published in: Journal of physical chemistry. C Vol. 117; no. 2; pp. 1053 - 1058
• Main Authors: Hinderhofer, A, Gerlach, A, Broch, K, Hosokai, T, Yonezawa, K, Kato, K, Kera, S, Ueno, N, Schreiber, F
• Format: Journal Article
• Language: English
• Published: Columbus, OH American Chemical Society 17-01-2013
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Exact sciences and technology; Physics; Structure and morphology; thickness; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Thin film structure and morphology; Thin films and multilayers; Interlayers; Frontier orbital; Grazing incidence; XRD; Perylene derivatives; Thin films; Electronic structure; Domain structure; Anisotropy; Fullerenes; Ultraviolet photoelectron spectra; Structure modification; Crystal structure
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/jp3106056

The structural order of C60 thin films is shown to be significantly improved by inserting a templating layer of diindenoperylene (DIP) between the SiO2 substrate and C60. In contrast to growth on an amorphous substrate like SiO2, C60 grown on DIP exhibits alignment of fcc-domains with the (111) plane parallel to the substrate and a significant increase of the coherent in-plane island size by a factor of ∼4. Modification of the structural quality of the DIP bottom layer leads to a change in structural order in the C60 top layer. In addition, ultraviolet photoelectron spectroscopy data from templated and nontemplated C60 films are discussed. In contrast to other anisotropic organic molecules, for C60 the spectral broadening and density of states of the highest occupied molecular orbital region do not depend significantly on the structural order in the C60 film, which can be rationalized by the isotropic shape of the C60 molecule.