Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 101: Graphene: Preparation and characterization II (O, jointly with HL, TT)

HL 101.3: Vortrag

Freitag, 15. März 2013, 11:00–11:15, H17

Non-destructive chemical functionalization of single-layer graphene for electronic applications — Mirosław Woszczyna¹, Miriam Grothe¹, Andreas Winter², Annika Willunat¹, Stefan Wundrack¹, Rainer Srosch¹, Franz Ahlers¹, Thomas Weimann¹, and •Andrey Turchanin² — ¹Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — ²Faculty of Physics, University of Bielefeld, 33615 Bielefeld, Germany

Chemical functionalization of single-layer graphene (SLG) is of key importance for implementations of this material in functional electronic devices such as, e.g., field effect transistor (FET) based nanosensors. However, the electronic quality of graphene typically degrades after the functionalization with presently employed methods, significantly restricting the application areas. Here, we present a route to non-destructive chemical functionalization of graphene via engineering of carbon nanomembrane (CNM)/SLG hybrids. We employ SLG, grown by methane CVD on Cu foils, and amino-terminated 1 nm thick CNMs, generated by electron-beam-induced crosslinking of aromatic self-assembled monolayers, to fabricate hybrid CNM/SLG FETs on oxidized silicon wafers. Structural, chemical and electronic properties of these devices are characterized by Raman spectroscopy, X-ray photoelectron spectroscopy and electrical transport measurements. We unambiguously show that the intrinsically high electronic quality of pristine SLG is preserved in the amino-functionalized hybrids opening broad avenues for their use in graphene-based FETs.