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O: Fachverband Oberflächenphysik

O 98: Metal and Semiconductor Substrates: Adsorption and Reactions of Small Molecules

O 98.8: Vortrag

Freitag, 21. März 2025, 12:15–12:30, H8

Ge(CH2I)4 on Si(100) - Matching the Molecule to the Surface — •Brandon Blue, Rafik Addou, Damian G. Allis, Eduardo Barrera-Ramirez, Jeremy Barton, Adam Bottomley, Nina Culum, Michael Drew, Tyler Enright, Alan Godfrey, Ryan Groome, Aru Hill, Taleana Huff, Robert J. Kirby, Samuel Lilak, Cameron J. Mackie, Oliver MacLean, Terry McCallum, Mathieu Morin, Matthew Moses, Jonathan Myall, Ryan Plumadore, Adam Powell, Henry Rodriguez, Marc Savoie, Benjamin Scheffel, Marco Taucer, Denis Alexander Therien, Dusan Vobornik, and Janice Wong — CBN Nanotechnologies Inc.

We present an on-surface, multi-technique analysis of a synthetic, custom molecule for Si(100): tetrakis(iodomethyl)germane - Ge(CH2I)4, or TIMe-Ge. TIMe-Ge consists of four iodomethyl (CH2I) legs bound to a Ge atom core in a tetrahedral geometry. TIMe-Ge was selected based on its expected reactivity and surface behavior with Si(100)-2x1 as part of a set of design criteria which we'll present and discuss. The suitability of TIMe-Ge with respect to these criteria were supported by simulations and literature precedent. TIMe-Ge was found to covalently bond with Si(100)-2x1 in a limited number of configurations via C-I dissociative addition by STM, DFT, and XPS. The fourth CH2I is oriented away from the surface and towards the SPM for interaction, including controlled generation of C-centered radicals via bias pulses and UV photochemistry. We anticipate that TIMe-Ge and its congeners will aid in the development of molecular nanotechnologies and the study of requisite intermediates.

Keywords: scanning tunneling microscopy (STM); ultra-high vacuum (UHV); Si(100); organic molecules; X-ray photoemission spectroscopy (XPS)