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Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 61: Posters III (Organic-inorganic perovskite semiconductors; Organic photovoltaics and electronics; Photovoltaics; Energy science; New materials and concepts)

HL 61.23: Poster

Wednesday, March 18, 2015, 15:00–20:00, Poster F

Charge Transfer at the Rubrene/F16CoPc Interface Studied by X-ray Photoemission Spectroscopy and Near Edge X-ray Absorption Fine Structure — •Jing Guo1, Florian Rückerl2, Francisc Haidu1, Volodymyr Dzhagan1, Georgeta Salvan1, Martin Knupfer2, and Dietrich R. T. Zahn11Semiconductor Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany — 2Leibniz Institute for Solid State and Materials Research Dresden, Electronic and Optical Properties Department, D-01069 Dresden, Germany

We studied the electronic properties of the F16CoPc/rubrene interface using X-ray photoemission spectroscopy (XPS) and near edge X-ray absorption fine structure (NEXAFS). Due to the matching between the ionization potential of rubrene and the electron affinity of F16CoPc, a charge transfer is expected to occur at the interface. Ferromagnetic LSMO layers were applied as substrates for the thin film growth due to potential spintronic application of such structures. The electron transfer from rubrene to the Co metal center is deduced from the lineshape of Co 2p band in the XPS spectra, resulting in a reduction of Co(II) to Co(I). NEXAFS data show a filling of the Co 3d2 orbital of F16CoPc, confirming the charge transfer. Besides, NEXAFS spectra show that F16CoPc molecules have a tendency to stand on rubrene. The energy level alignment between rubrene and LSMO was also established using ultraviolet photoelectron spectroscopy and inverse photoemission spectroscopy

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