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- W3205372938 abstract "In this work, the Raman spectroscopy mapping technique is used for the analysis of mechanical strain in Bi2Se3 thin films of various (3-400 nm) thicknesses synthesized by physical vapour deposition on amorphous quartz and single-layer graphene substrates. The evaluation of strain effects is based on the correlation analysis of in-plane (E2g) and out-of-plane (A21g) Raman mode positions. For Bi2Se3 films deposited on quartz, experimental datapoints are scattered along the line with a slope of ∼0.85, related to the distribution of hydrostatic strain. In contrast to quartz/Bi2Se3 samples, for graphene/Bi2Se3 heterostructures with the same thicknesses, an additional negative slope of ∼-0.85, which can be associated with the distribution of the in-plane (a-b) biaxial tensile strain due to the film-substrate lattice mismatch, is observed. The algorithm of phonon deformation potential (PDP) calculation based on the proposed strain analysis for the 3 nm thick Bi2Se3 film deposited on the graphene substrate, where the strain is considered to be coherent across the thickness, is demonstrated. The PDPs for biaxial in-plane strain of the Bi2Se3 3 nm film in in-plane and out-of-plane modes are equal to -7.64 cm-1/% and -6.97 cm-1/%, respectively." @default.
- W3205372938 created "2021-10-25" @default.
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- W3205372938 date "2021-01-01" @default.
- W3205372938 modified "2023-10-18" @default.
- W3205372938 title "Correlation analysis of vibration modes in physical vapour deposited Bi<sub>2</sub>Se<sub>3</sub> thin films probed by the Raman mapping technique" @default.
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- W3205372938 doi "https://doi.org/10.1039/d1na00390a" @default.
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