Three-dimensional molecular packing of thin organic films of PTCDI-C8 determined by surface X-ray diffraction |
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Authors: | Krauss Tobias N Barrena Esther Zhang Xue N de Oteyza Dimas G Major János Dehm Volker Würthner Frank Cavalcanti Leide P Dosch Helmut |
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Affiliation: | Max-Panck-Institut fur Metallforschung, Heisenbergstrasse, Stuttgart, Germany. |
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Abstract: | We have determined the full molecular 3D packing of thin organic films of the archetypical organic n-type semiconductor N, N'-dioctyl-3,4:9,10-perylene tetracarboxylic diimide (PTCDI-C 8) by surface X-ray crystallography. We show that PTCDI-C 8 forms smooth layered films on Al 2O 3 (11-20) with an outstanding degree of molecular order. The thin-film structure is found to consist of a triclinic unit cell with the plane of the aromatic core tilted by 67 +/- 2 degrees with respect to the surface plane, which differs significantly from the bulk structure. The 3D crystallites extend with vertical coherent order across the entire film thickness. |
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