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The innovative two-step passivation by octadecanethiol (ODT) self-assembled monolayers (SAMs) and the following silicon dioxide (SiO2) deposition was used for the type-II InAs/GaSb superlattice photodetector. To understand the mechanism of passivation, the (100) GaSb surface covered with the ODT and, for comparison, with the biphenyl thiol (BPT), was characterized by the atomic force microscopy, Raman...
The first-order orthorhombic–rhombohedral phase transition of La1−xSrxGa1−yMnyO3 (LSGMn) crystals is studied by Raman spectroscopy. An increase in Mn content causes significant changes in Raman spectra, especially in the high-wavenumber spectral range. The Raman spectrum of La1−xSrxGa1−yMnyO3 compound with x = y = 0.02 is dominated by MnO6 internal vibrations. Moreover, a change in the...
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