Electronic polarization at surfaces and thin films of organic molecular crystals: PTCDA

Details Electronic polarization at surfaces and thin films of organic molecular crystals: PTCDA Electronic polarization at surfaces and thin films of organic molecular crystals: PTCDA

2002-05-16

arxiv.org/abs/cond-mat/0205351v1

Physics

Condensed Matter

5 pages, 4 postscript figures embedded

Scientific paper

10.1016/S0009-2614(02)00774-1

The electronic polarization energies, P = (P+) + (P-), of a PTCDA (perylenetetracarboxylic acid dianhydride) cation and anion in a crystalline thin film on a metallic substrate are computed and compared with measurements of the PTCDA transport gap on gold and silver. Both experiments and theory show that P is 500 meV larger in a PTCDA monolayer than in 50 A films. Electronic polarization in systems with surfaces and interfaces are obtained self-consistently in terms of charge redistribution within molecules.

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