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O: Fachverband Oberflächenphysik

O 11: [DS] Organic electronics and photovoltaics I (jointly with CPP, HL, O)

O 11.2: Vortrag

Montag, 26. März 2012, 15:30–15:45, H 2032

Transport properties of hybrid organic/ferromagnetic metal heterojunctions based on strained nanomembranes — •Maria Esperanza Navarro Fuentes, Carlos Cesar Bof Bufon, Daniel Grimm, and Oliver G Schmidt — Institute for Integrative Nanosciences, IFW-Dresden, Helmholtz Strasse 20, 01069 Dresden, Germany

In this work we investigated the transport properties of organic/inorganic hybrid heterojunctions formed by rolled-up nanomembranes. This method allowed us to create soft metallic contacts on self-assembled monolayers (SAM) of phosphonic acids. As previously reported, the metal/SAM contact can be accomplished regardless the presence of pinholes in the thin organic layer [1]. By comparing the field-emission plots of hybrid heterojunctions formed by the combination of noble and ferromagnetic metals we were able to evaluate the influence of the interfacial oxide layer in transport properties of such heterojunctions. Moreover, the evaluation of the current-voltage curves allow us to clearly distinguish whether the tunneling behaviour is due to the native oxide of the ferromagnet or to the SAM layer behaving as an ultra-thin insulating material. In this particular case, the capability of understanding the nature of the organic/inorganic interface and their influence on the transport properties is an essential step in the creation organic spin valves.

[1] Bufon, C.C.B. et.al.; Nano Lett., 2011, 11 (9), 3727.