Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 29: Poster: Organic semiconductors and hybrid organic-inorganic heterostructures / Organic photovoltaics

HL 29.3: Poster

Monday, March 31, 2014, 17:00–20:00, P2

Charge transfer and electrical conductance at the F₁₆CoPc-Rubrene interface — •Yulia Krupskaya¹, Susi Lindner², Benjamin Mahns², Martin Knupfer², and Alberto Morpurgo¹ — ¹University of Geneva, CH-1211 Geneva, Switzerland — ²IFW Dresden, D-01171 Dresden, Germany

Here we present an electronic transport study of the F₁₆CoPc-Rubrene interface. Originally both materials Rubrene (5,6,11,12-tetraphenyltetracene) and F₁₆CoPc (cobalt(II) 1,2,3,4,8,9,10,11,15,16,
17,18,22,23,24,25-hexadecafluoro-29H,31H-phthalocyanine) are large-gap undoped semiconductors and eventually insulators. The interfaces were prepared by evaporating the F₁₆CoPc film on top of the Rubrene single crystal. Four-probe electronic transport measurements were performed at applied voltages up to 40 V and temperatures between 30 K and 300 K. The measurements reveal the resistivity per square of the interface of approximately 300 kΩ at room temperature, which is in general rather low in comparison to previously studied organic interfaces [1] and lowest after outstanding TTF-TCNQ interface [2]. The obtained temperature dependence indicates slight metallic behavior of the resistivity which decreases by 20 % while cooling from 300 K to 100 K. Below 100 K the resistivity increases reaching 370 kΩ at 30 K. The observed electrical conductance originates from a rather big charge transfer between the two materials that takes place at their interface.

[1] I. Gutiérrez Lezama et al. Nature Mat. 11, 588-794 (2012)

[2] H. Alves et al. Nature Mat. 7, 574-580 (2008)