title: Resonant Raman scattering of ZnSxSe1-x solid solutions: the role of S and Se electronic states.
abstract: A comprehensive Raman resonance scattering study of ZnSxSe1-x (ZnSSe) solid solutions over the whole compositional range (0 ≤ x ≤ 1) has been carried out using 325 and 455 nm excitation wavelengths. The Raman scattering intensities of LO ZnS-like and ZnSe-like phonon modes, corresponding to pure S and Se vibrations, respectively, are revealed to be significantly enhanced when excited with 325 nm excitation in the case of S vibrations, and with 455 nm in the case of Se vibrations. This behavior is explained by the interaction of the excitation photons with the corresponding S or Se electronic states in the conduction band, and further confirmed by first principles simulations. These findings advance the fundamental understanding of the coupling between the electronic transitions and photons in the case of Raman resonance effects, and provide inputs for further studies of lattice dynamics, especially in the case of chalcogenide materials. Additionally, the coexistence of modes corresponding to only S vibrations and only Se vibrations in the ZnSSe alloys makes these results applicable for the compositional assessment of ZnSSe compounds.
authors.affiliation: Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besòs, Spain. mdimitrievska@irec.cat vizquierdo@irec.cat.
authors.forename: M
authors.initials: M
authors.lastname: Dimitrievska
authors.affiliation: Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besòs, Spain. mdimitrievska@irec.cat vizquierdo@irec.cat.
authors.forename: H
authors.initials: H
authors.lastname: Xie
authors.affiliation: Centre for Sustainable Chemical Technologies and Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
authors.forename: A J
authors.initials: AJ
authors.lastname: Jackson
authors.affiliation: Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besòs, Spain. mdimitrievska@irec.cat vizquierdo@irec.cat.
authors.forename: X
authors.initials: X
authors.lastname: Fontané
authors.affiliation: Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besòs, Spain. mdimitrievska@irec.cat vizquierdo@irec.cat.
authors.forename: M
authors.initials: M
authors.lastname: Espíndola-Rodríguez
authors.affiliation: Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besòs, Spain. mdimitrievska@irec.cat vizquierdo@irec.cat.
authors.forename: E
authors.initials: E
authors.lastname: Saucedo
authors.affiliation: Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besòs, Spain. mdimitrievska@irec.cat vizquierdo@irec.cat and IN2UB, University of Barcelona, C. Martí Franquès 1, 08028 Barcelona, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Pérez-Rodríguez
authors.affiliation: Centre for Sustainable Chemical Technologies and Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
authors.forename: A
authors.initials: A
authors.lastname: Walsh
authors.affiliation: Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besòs, Spain. mdimitrievska@irec.cat vizquierdo@irec.cat.
authors.forename: V
authors.initials: V
authors.lastname: Izquierdo-Roca