Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 31: Organic Electronics and Photovoltaics III: Mobile and Trapped Charges
HL 31.7: Talk
Tuesday, March 21, 2017, 11:15–11:30, ZEU 260
Electronic components embedded in a single graphene nanoribbon — •Peter Jacobse1,2, Fabian Schulz3, Adri van den Hoogenband2, Marc-Etienne Moret2, Robertus Klein-Gebbink2, Peter Liljeroth3, and Ingmar Swart1 — 1Debye Institute for Nanomaterials Science, Utrecht University, PO Box 80000, 3508 TA Utrecht, The Netherlands — 2Princetonplein 1 — 32Department of Applied Physics, Aalto University School of Science, PO Box 15100, 00076 Aalto, Finland
On-surface synthesis offers a convenient route to atomically well-defined graphene nanoribbons (GNRs) with a precisely controlled width and edge structure. In addition to monocomponent ribbons, GNR heterojunctions joining two semiconducting segments with different band gaps (through ribbon width) or different band-alignment (through nitrogen substitution) have been demonstrated. The driving force in this direction is to build more functionality into a single ribbon for applications in GNR-based electronics or photovoltaics. However, the GNR equivalents of a metal-semiconductor junction or a tunnel barrier have not yet been realized. We embed these junctions in a single GNR by joining armchair GNRs belonging to the metallic (5-atom wide) and semiconducting (7-atom wide) families through on-surface synthesis. We characterize the atomic scale geometry and electronic structure by combined atomic force microscopy (AFM), scanning tunneling microscopy (STM) and conductance measurements. The GNR equivalent of a tunnel barrier constitutes a first step towards complete electronic devices built into a single GNR.