Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 99: Organic Semiconductors: Transport
HL 99.8: Vortrag
Freitag, 30. März 2012, 11:30–11:45, EW 203
Transport properties of molecular thin films connected by strained nanomembranes — •Carlos Cesar Bof Bufon1, Celine Vervacke1, Dominic J. Thurmer1, Michael Fronk3, Georgeta Salvan3, Dietrich R. T. Zahn3, and Oliver G. Schmidt1,2 — 1Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany — 2Material Systems for Nanoelectronics, Chemnitz University of Technology, Reichenhainerstrasse 70, 09107 Chemnitz, Germany — 3Institute of Physics, Chemnitz University of Technology, Reichenhainerstrasse 70, 09107 Chemnitz, Germany
In this work, rolled-up metallic nanomembranes are used to contact thin film molecular layers (CuPc) with thickness (10nm) smaller than the interdiffusion length of metallic atoms. The fabrication process is based on a recently developed method where strained nanomembranes are used to create hybrid organic/inorganic heterojunctions[1]. The fabricated heterojunction allow us to precisely control and map the charge transport mechanisms in such devices over a wide range of temperatures and electric fields. The transport characteristics of CuPc thin films resembles what have been reported for molecular wires, namely, the transition from activated hopping to tunneling by changing temperature and voltage. In the Au/CuPc/Au heterojunctions the transport is dominated by impurities/defects states at high temperatures and by cooling down, the continuous transition from direct tunneling to resonant tunneling to field emission is obtained by sweeping the voltage bias up. Such a continuous transition has not been reported so far for this type of heterojunction. [1]Bufon,C.C.B., Nano Lett.11,3727 (2011)