Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 3: Inorganic/Organic Interfaces: Growth I
O 3.10: Vortrag
Montag, 16. März 2015, 12:45–13:00, MA 005
Structural, optical, and electronic properties of mono- and multilayers of tetraphenyldibenzoperiflanthene (DBP) — •Tino Kirchhuebel1, Tino Morgenroth1, Marco Gruenewald1, Roman Forker1, Takashi Yamada2, Toshiaki Munakata2, Fabio Bussolotti3, Satoshi Kera3, Nobuo Ueno3, and Torsten Fritz1 — 1Friedrich Schiller University, Institute of Solid State Physics, Helmholtzweg 5, 07743 Jena, Germany — 2Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan — 3Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
The dye molecule tetraphenyldibenzoperiflanthene (DBP, C64H36) [1] is a promising candidate for usage in opto-electronic devices . It consists of an aromatic backbone and four additional phenyl rings perpendicular to the molecular plane. In order to investigate the growth and the optical properties of DBP on various substrates from submonolayers to 10 monolayers, in situ differential reflectance spectroscopy (DRS) [2,3] measurements were performed. A strong interaction between molecules and single crystalline metal surfaces was found, where structural characterization by low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM) at cryogenic temperatures revealed a well-ordered flat-lying thin film growth in a herringbone arrangement in the first monolayer. Depending on the coverage two distinct spectral fingerprints of DBP molecules could be identified for multilayer films. To elucidate their origin, complementary photoelectron spectroscopies as well as (time dependent) density functional theory ((TD-)DFT) calculations were performed.