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DS: Fachverband Dünne Schichten
DS 32: Poster: Optical Analysis of Thin Films
DS 32.1: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P1A
Revealing The Chemical Structures Of Silicon Nanoribbons On Ag(110) Via DFT And Raman Spectroscopy — •Alexander Ehm1, Dmytro Solonenko1, Jorge I. Cerda2, Dietrich R. T. Zahn1, and Patrick Vogt1 — 1Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany — 2Instituto de Ciencia de Materiales de Madrid, ICMM-CSIC, Cantoblanco, 28049 Madrid, Spain
Silicon nanoribbons grown on Ag(110) exhibit a pentagonal Si structure along the missing row arrangement of the Ag surface [1]. Depending on the deposition temperature, nanoribbons can form a single- or a double-strand structure, which differs by the distance between the neighbouring chains. Even though double-strand nanoribbons have no bonds between the strands, the properties of the two single ribbons are influenced by their close proximity. In order to elucidate this interaction, we performed a combined study of single- and double-strand Si nanoribbons by Raman spectroscopy and density functional theory (DFT). The results show that nanoribbons exhibit a vibrational fingerprint distinct from 3D bulk Si or 2D silicene [2]. The vibrational signature is not only related to the pentagonal building block of nanoribbons, but also to their electronic properties, which are altered, when two Si nanoribbons are located in close proximity. This leads to a prominent Raman band around 380 cm−1, a marker for the formation of double strand ribbons. The possible mechanisms and the origin of this band are discussed.