Impact of MoS2 Monolayers on the Thermoelastic Response of Silicon Heterostructures
Year: 2024
Authors: Soranzio D., Puntel D., Tuniz M., Majchrzak PE., Milloch A., Olsen NM., Bronsch W., Jessen BS., Fainozzi D., Cresi JSP., De Angelis D., Foglia L., Mincigrucci R., Zhu XY., Dean CR., Ulstrup S., Banfi F., Giannetti C., Parmigiani F., Bencivenga F., Cilento F.
Autors Affiliation: Eidgenoss TH ETH Zurich, Inst Quantum Elect, CH-8093 Zurich, Switzerland; Univ Trieste, Dipartimento Fis, IT-34127 Trieste, Italy; Aarhus Univ, Interdisciplinary Nanosci Ctr iNANO, Dept Phys & Astron, DK-8000 Aarhus C, Denmark; Univ Cattolica Sacro Cuore, Dept Math & Phys, IT-25133 Brescia, Italy; Univ Cattolica Sacro Cuore, ILAMP Interdisciplinary Labs Adv Mat Phys, IT-25133 Brescia, Italy; Katholieke Univ Leuven, Dept Phys & Astron, B-3001 Leuven, Belgium; Columbia Univ, Dept Chem, New York, NY 10027 USA; Elettra Sincrotrone Trieste SCpA, IT-34149 Trieste, Italy; Columbia Univ, Dept Phys, New York, NY 10027 USA; Univ Claude Bernard Lyon 1, Univ Lyon, CNRS, Inst Lumiere Matiere, F-69622 Lyon, France; CNR INO Natl Inst Opt, IT-25123 Brescia, Italy; Univ Cologne, Int Fac, D-50923 Cologne, Germany.
Abstract: Understanding the thermoelastic response of a nanostructure is crucial for the choice of materials and interfaces in electronic devices with improved and tailored transport properties at the nanoscale. Here, we show how the deposition of a MoS2 monolayer can strongly modify the nanoscale thermoelastic dynamics of silicon substrates close to their interface. We demonstrate this by creating a transient grating with extreme ultraviolet light, using ultrashort free-electron laser pulses, whose approximate to 84 nm period is comparable to the size of elements typically used in nanodevices, such as electric contacts and nanowires. The thermoelastic response, featuring coherent acoustic waves and incoherent relaxation, is tangibly modified by the presence of monolayer MoS2. Namely, we observed a major reduction of the amplitude of the surface mode, which is almost suppressed, while the longitudinal mode is basically unperturbed, aside from a faster decay of the acoustic modulations. We interpret this behavior as a selective modification of the surface elasticity, and we discuss the conditions to observe such effect, which may be of immediate relevance for the design of Si-based nanoscale devices
Journal/Review: ACS APPLIED NANO MATERIALS
Volume: 7 (13) Pages from: 15317 to: 15324
More Information: A.M. and C.G. acknowledge financial support from MIUR through the PRIN 2015 (Prot. 2015C5SEJJ001) and PRIN 2017 (Prot. 20172H2SC4_005) programs and from the European Union – Next Generation EU through the MUR-PRIN2022 (Prot. 20228YCYY7) program. C.G. acknowledges support from Universita Cattolica del Sacro Cuore through D.1, D.2.2 and D.3.1 grants. Sample fabrication of sample #2 was supported by the Columbia Nano Initiative and Columbia Materials Science and Engineering Research Center (MRSEC) through NSF grant DMR-2011738. P.M and S.U. acknowledge funding from the Danish Council for Independent Research, Natural Sciences under the Sapere Aude program (Grant no. DFF-9064-00057B), VILLUM FONDEN under the Centre of Excellence for Dirac Materials (grant 11744), and from the Novo Nordisk Foundation (Project Grant NNF22OC0079960).KeyWords: MoS2; monolayer; time-resolved; thermoelasticity; heterostructure; SAW; dynamicsDOI: 10.1021/acsanm.4c02096Connecting to view paper tab on IsiWeb: Click here