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 61.22: Poster

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

Charge transfer and metallic conduction at the F₁₆CoPc - Rubrene interface — •Florian Rückerl¹, Yulia Krupskaya², Eni Dodbiba¹, Vasilis Nikolis¹, Alberto Morpurgo², and Martin Knupfer¹ — ¹IFW Dresden, Germany — ²DPMC University of Geneva, Switzerland

We present the electronic properties of the F₁₆CoPc-Rubrene interface, studied by means of transport measurements and photoemission spectroscopy (PES). The interface (formed of F₁₆CoPc film evaporated on top of Rubrene single crystals) shows a slight metallic conductance at temperatures between 100 and 300 K with the resistivity of 300 kΩ, which is very low in comparison to previously studied organic interfaces [1] and lowest after the outstanding TTF-TCNQ interface [2]. Hall Effect measurements revealed the hole conductance in Rubrene with the hole density of 1.6·10¹³ cm² and the mobility of 1.2 cm²/Vs. PES measurements at the interface with various layer thicknesses give clear evidence for a charge transfer. We observe an oxidation of the Rubrene molecules and a reduction of the Phthalocyanine Cobalt center by filling the 3d_z² orbital.

The very low resistivity and the fact that the magnetic Co ion is fully involved in the charge transfer process, makes this system especially interesting and promising in terms of organic electronics and molecular spintronics.
Financial support: KN 393/14, KR 4364/1-1
I. Gutierrez Lezama et al. Nature Mat. 11, 588-794 (2012)
H. Alves et al. Nature Mat. 7, 574-580 (2008)