Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 5: Nanostructures at Surfaces I: Organics
O 5.5: Talk
Monday, April 1, 2019, 11:30–11:45, H15
Confined states in self-assembled (OH)2-pyrene porous networks on Ag(111) — •Philipp D’Astolfo1, Rémy Pawlak1, Carl Drechsel1, Thilo Glatzel1, Silvio Decurtins2, Shi-Xia Liu2, and Ernst Meyer1 — 1Department of Physics, University of Basel, Klingelbergstrasse 82, Basel, CH 4056 — 2Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Bern, CH 3012
Quantum dots are known to confine electrons within their structure. Recently, porous networks obtained by assembling organic molecules on metal surfaces have also shown to confine the surface electrons into their cavities, forming an array of virtual quantum dots[1-3]. Here, we investigated 2,7-Dihydroxypyrene molecules, self-assembled onto an atomically flat Ag(111) surface, using scanning tunneling microscopy (STM) and atomic force microscopy (AFM) at 4K with CO-terminated tips. Two porous network morphologies are identified that are constituted by either pure 6-member pore assemblies or mixed assemblies of 6-, 8-, and 9-member pores. By comparing their electronic properties, we found a shift of the energy levels of the confinement depending on the pore size. Interestingly, 6-member pores in the mixed assembly exhibit a +30 meV higher energy than 6-member pores in the pure counterpart, despite having the same pore diameter.
[1] Piquero-Zulaica et al., Nat. Comm., 2017, 8, 787.
[2] Lobo-Checa et al., Science, 2009, 325, 300-303.
[3] Klappenberger et al., Phys. Rev. Lett., 2011, 106, 026802.