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One step at a click – Selective Click Reactions for controlled Layer-by-Layer Deposition of Organic Molecules on Silicon

The application of molecular layer deposition on silicon surfaces may open the route to directly synthesizing organic molecular architectures with tailored physical and/or physicochemical properties on the technologically most relevant silicon substrates (“more than Moore”).

Using a combination of two selective and orthogonal click reactions (Cu-mediated and strain promoted azide-alkyne couplings), we could experimentally realize such a controlled layer-by-layer growth of organic architectures on Si(001). Starting point was the Si(001) substrate which was selectively functionalized with a substituted cyclooctyne under ultrahigh-vacuum (UHV) conditions. The subsequent layer-by-layer synthesis using the two orthogonal click chemistry reaction steps was then performed in solution in an alternating fashion. The product of each reaction step was the next layer of organic molecules; detailed analysis of each reaction step was performed in UHV by means of X-ray photoelectron spectroscopy.

Together with previous studies on selective functionalization of the Si(001) surface and the combination of UHV-based surface chemistry with solution-based click chemistry, a complete toolbox for the well-controlled growth of molecular structures on silicon is now available.

Publication: T. Glaser, J. A. Peters, D. Scharf, U. Koert, and M. Dürr, Layer-by-Layer Deposition of Organic Molecules Controlled by Selective Click Reactions, Chem. Mater. 36, 561 (2024). DOI: 10.1021/acs.chemmater.3c02707

Dieses Bild wurde eingereicht von Prof. Dr. Michael Dürr.

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