Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 27: Organische Dünnschichten I

O 27.6: Vortrag

Donnerstag, 27. März 2003, 12:30–12:45, HSZ/02

An STM study of organic molecules in mixed phases: PTCDA and CuPC on Cu(111) — •Christian Bobisch, Amin Bannani, Thorsten Wagner, and Rolf Möller — Universität Essen, Fachbereich Physik, Institut für experimentelle Physik, 45117 Essen

In this work we will report on the mixed monolayer formed by the organic molecules 3,4,9,10-perylene-tetra-carboxylic-dianhydride (PTCDA) and copper-phthalocyanine (CuPC). The binary molecule film has been prepared in UHV by molecular beam epitaxy while the substrate was held at room temperature. The amount of each species was an equivalent of 0.7 monolayers. Afterwards the sample was tempered by a linear temperature ramp ending at 450K. STM measurements reveal two ordered mixed structures. One phase consists of an oblique unit cell (No-dqMickey-MouseNo-dq-phase) consisting of one CuPC- and two PTCDA-molecules, hence a ratio of 1:2. The other regular unit cell contains two CuPC- and six PTCDA-molecules yielding a ratio of 1:3. Subsequent temper procedures showed a domination of the No-dqMickey-MouseNo-dq-phase. At temperatures higher than 550K the ordering is destroyed.