Bi-modal Raman response of Be–Se vibration in Zn1−−Mg Be Se alloys

Contactless electroreflectance and photoluminescence characterization of Zn0.68Be0.06Mg0.26Se crystalline alloys

“…4. The energy difference between the two peaks amounts to 22 meV that is smaller than the energy of the longitudinal optical (LO) phonon of Zn-Se mode at the point obtained for Zn 1−x−y Mg x Be y Se alloys [28]. Fitting results show that FX 3C peak has a smaller full width at half maximum (FWHM) equal 15 meV in contrast to FWHM of the broader LX peak of 33 meV.…”

Raman scattering characterization of Zn1‐x‐yMgyBexSe mixed crystals

“…The BeSe-like data from Zn 0.70 Mg 0.15 Be 0.15 Se are compared with those reported by Ajjoun et al [8] on Zn 0.85 Be 0.15 Se where the TO h Be-Se and TO s Be-Se are located at 412 and 460 cm -1 , respectively. The TO h Be-Se (~396 cm -1 ) and TO s Be-Se (~451 cm -1 ) modes emerge at lower wavenumbers in Zn 0.70 Mg 0.15 Be 0.15 Se.…”

“…x-y Mg y Be x Se can be regarded as a pseudo-ternary system with the hard-like BeSe compound and the soft-like pseudo-binary (Zn,Mg)Se system as parent materials [8]. Therefore, one can expect that the Be-Se signal in Zn 1-xy Mg y Be x Se exhibits the same bi-modal as in Zn 1-x Be x Se.…”

Multimode phonon structure of Be‐containing II ‐ VI mixed crystals determined by IR spectroscopic ellipsometry

“…Lattice vibrations are strictly related to the mechanical and thermodynamic properties of the system. As a consequence of replacing Zn(Mg, Mn, Cd) by the lighter atom Be the phonon frequencies of alloys are changed [10][11][12][13][14] and their lattice dynamics displays multiphonon structure [15,16]. Microscopic description of the physical properties of semiconductor alloys can be derived from understanding their electronic structure and nature of interatomic bonds.…”

“…Quantitative characterisation of the IR-SE spectra in terms of the transverse-optical phonon (TO) and longitudinal-optical phonon (LO) parameters was performed using classical dispersion formulae for free charge carriers (a Drude term) and a sum of damped harmonic oscillators for phonon absorption in modelling the optical functions ε (ω) and Im[ 1/ − ε (ω)]. A limited number of studies have been done on the lattice vibration of Be-containing ternary and quaternary alloys [10][11][12][13][14][16][17][18][19][20]. Most of the experimental data concern the Raman spectra of epitaxial layers.…”