3 years ago

Energy-Level Alignment of a Hole-Transport Organic Layer and ITO: Toward Applications for Organic Electronic Devices

Energy-Level Alignment of a Hole-Transport Organic Layer and ITO: Toward Applications for Organic Electronic Devices
François Rochet, Jean-Jacques Gallet, Mathieu Silly, Albano Cossaro, Stéphane Carniato, Denis Fichou, Etienne Derat, Vincent Barth, Luca Floreano, Anthony Boucly, Fabrice Bournel, Fausto Sirotti, Ludovic Tortech, Quentin Arnoux, Rabah Benbalagh
2,2′,6,6′-Tetraphenyl-4,4′-dipyranylidene (DIPO-Ph4) was grown by vacuum deposition on an indium tin oxide (ITO) substrate. The films were characterized by atomic force microscopy as well as synchrotron radiation UV and X-ray photoelectron spectroscopy to gain an insight into the material growth and to better understand the electronic properties of the ITO/DIPO-Ph4 interface. To interpret our spectroscopic data, we consider the formation of cationic DIPO-Ph4 at the ITO interface owing to a charge transfer from the organic layer to the substrate. Ionization energy DFT calculations of the neutral and cationic species substantiate this hypothesis. Finally, we present the energetic diagram of the ITO/DIPO-Ph4 system, and we discuss the application of this interface in various technologically relevant systems, as a hole-injector in OLEDs or as a hole-collector interfacial layer adjacent to the prototypical OPV layer P3HT:PCBM.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b06691

DOI: 10.1021/acsami.7b06691

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