Regensburg 2019 – scientific programme

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DS: Fachverband Dünne Schichten

DS 14: Poster

DS 14.36: Poster

Tuesday, April 2, 2019, 17:00–20:00, Poster E

Functionalization of Silicon Nanoribbons on Ag(110) — •Alexander Ehm, Dmytro Solonenko, Dietrich R.T. Zahn, and Patrick Vogt — Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany

Silicon nanoribbons (SiNRs) are quasi one-dimensional one-atom thin Si structures, forming under ultra-high vacuum conditions on well-ordered Ag(110) surfaces. These SiNRs have a width of 1.6 nm, a length of several 100 nm and are well aligned parallel to each other, along the Ag[-110] direction [1]. The atomic structure of the SiNRs is explained by inter-connected Si pentagons [2], a structure unique among all Si-related materials, leading to distinct properties when e.g. to diamond like Si. Oxidation of the SiNRs by exposure to molecular oxygen, for example, proceeds along the ribbons, starting from their extremities, while their edges and top are stable [3].

We used in situ Raman spectroscopy to get further insight into the vibrational properties of SiNRs and investigate their modification through oxygen and hydrogen adsorption. Our results confirmed the "burning match" effect [3], suggesting a higher stability of SiNRs when compared to other 2D Si materials. Oppositely, the hydrogenation of SiNRs fails, the reasons of which will be discussed.

[1] C. Leandri et al., Surface Science 574, L9-L15 (2005)

[2] J. I. Cerda et al., Nat. Comm. 13076 (2016)

[3] P. De Padova et al., Nano Lett., Vol. 8, No. 8, 2299-2304 (2008)