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. Zahn¹ — ¹Semiconductor 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 3_d² 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