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Forschungszentrum Jülich GmbH Wilhelm-Johnen-Straße 52428 Jülich, Germany http://www.fz-juelich.de
Contact Mr Prof. Dr. Christian Kumpf +49 2461 611452
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Forschungszentrum Jülich GmbH

Scheinbar paradoxe Bindung organischer Halbleiter

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Je stärker die Bindung zwischen den Partnern, desto enger rücken sie zusammen. Das gilt nicht nur für Mensch und Tier, sondern auch für die Welt der Atome und Moleküle. Wissenschaftler aus Jülich und Graz beschreiben in der Fachzeitschrift Nature Communications (doi: 10.1038/ncomms4685) nun einen Fall, der sich entgegengesetzt verhält.

Der organische Halbleiter PTCDA bewegt sich von einer Metalloberfläche weg, wenn man ihn mit einem anderen Halbleitermaterial – nämlich Kupferphthalocyanin (CuPc) – mischt. Zugleich verstärkt sich jedoch die chemische Bindung an die Oberfläche. Diese scheinbar paradoxe Situation lässt sich dadurch erklären, dass das stärkere Molekül in der Verbindung Elektronen vom
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