Laser-driven self-organized evolution of 1D- and 2D-Nanostructures from metal thin-films on silicon: Influence of alloying and oxidation

Durbach, Sebastien; Kilian, H. G.; Hampp, Norbert

doi:10.1016/j.apsusc.2023.156927

Cited by 4 publications

(1 citation statement)

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“…This is a universal effect that is observed under certain conditions in laser writing experiments [ 14 ] and originates from the interaction between the incoming laser radiation with secondary waves that stem from scattering by surface roughness. The result is a self-organized regular spatial modulation (1D or 2D) of the local laser intensity, which in turn modulates the interaction with the surface, resulting typically in a regular modulation of the surface topography [ 15 ]. The modulation of the topography can be caused by material removal (laser ablation), where variations of the local intensity register in the amount of material that is removed, and thus the resulting topography reflects the optical intensity modulation [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Laser-Synthesized 2D-MoS2 Nanostructured Photoconductors

et al. 2023

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The direct laser synthesis of periodically nanostructured 2D transition metal dichalcogenide (2D-TMD) films, from single source precursors, is presented here. Laser synthesis of MoS2 and WS2 tracks is achieved by localized thermal dissociation of Mo and W thiosalts, caused by the strong absorption of continuous wave (c.w.) visible laser radiation by the precursor film. Moreover, within a range of irradiation conditions we have observed occurrence of 1D and 2D spontaneous periodic modulation in the thickness of the laser-synthesized TMD films, which in some cases is so extreme that it results in the formation of isolated nanoribbons with a width of ~200 nm and a length of several micrometers. The formation of these nanostructures is attributed to the effect that is known as laser-induced periodic surface structures (LIPSS), which is caused by self-organized modulation of the incident laser intensity distribution due to optical feedback from surface roughness. We have fabricated two terminal photoconductive detectors based on nanostructured and continuous films and we show that the nanostructured TMD films exhibit enhanced photo-response, with photocurrent yield increased by three orders of magnitude as compared to their continuous counterparts.

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Section: Introductionmentioning

confidence: 99%