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Substrate Selection for Full Exploitation of Organic Semiconductor Films: Epitaxial Rubrene on β-Alanine Single Crystals

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Trabattoni Silvia, Raimondo Luisa, Campione Marcello, Braga Daniele, Holmberg Vincent C., Norris David J., Moret Massimo, Ciavatti Andrea, Fraboni Beatrice, Sassella Adele,
Project Electronic Impurity Doping of Semiconductor Nanocrystals
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Original article (peer-reviewed)

Journal Advanced Materials Interfaces
Volume (Issue) 2(18)
Page(s) 1500423 - 1500423
Title of proceedings Advanced Materials Interfaces
DOI 10.1002/admi.201500423

Abstract

Rubrene (RUB) is one of the most studied organic semiconductors because, in the orthorhombic single-crystal phase, it exhibits a record exciton diffusion length and one of the highest charge carrier mobilities ever reported. Here, thin films of oriented crystalline RUB are successfully grown in vacuum on millimeter-sized (010)-β-alanine (β-ala) single crystals with a step-growth protocol, exploiting organic epitaxy. The experimental characterization demonstrates that these RUB films grow in the orthorhombic polymorph with the (100) RUB plane in contact with the (010) β-ala surface and with precise azimuthal orientations. A complementary study of the RUB(100)/β-ala(010) interface, performed by computational simulations, confirms the epitaxial relations expected by considering the molecular scale corrugations of the surfaces. Moreover, thanks to the wide transparency region of β-ala, the RUB absorption bands in the UV range are directly detected for the first time. Finally, removal of the water-soluble substrate enables the integration of the films in field effect transistors as high quality active organic layers. The characteristics of such RUB-based devices confirm the quality and versatility of epitaxial thin films for use in organic electronics.
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