Relations entre motifs structuraux et dynamique de réseau dans les cristaux mixtes Cu-Zn-Sn-Se : études premiers principes

Abstract : The works addresses vibrational properties of novel semiconductors, specifically the Cu2ZnSnSe4 and Cu2ZnSnS4 compounds of the kesterite structure, which, in the domain of photovoltaics, become competitive with leading materials of chalcopyrite type, notably Cu(In,Ga)Se2. The anticipated immediate practical interest of such study is that the vibration spectra are likely to make possible a distinction between different structural phases, possible for a given composition. The vibration modes are accessed by using a first-principle theory approach. The manuscript is divided into five chapters, with the following contents: (1) A brief introduction into the work principle and the problematics of photovoltaics, specifically of the solar cells based on multinary semiconductors; the chapter closes by the description of the phase diagram of the Cu-Zn-Sn-Se system. (2) An overview of the density functional theory (DFT) and of the technics of numerical simulations using the SIESTA code. (3) The vibrational properties of Cu2ZnSnSe4 in its two phases, kesterite and stannite, as studied by first-principles method, with a detailed comparison being done along with a thorough mode-by-mode analysis. (4) Vibrational properties of a secondary phase Cu2SnSe3, which often competes with the Cu2ZnSnSe4 phase in the process of sample growth. (5) Calculation of phonons in the Cu2ZnSnS4 structure containing intrinsic defects (vacances; anti sites), with the objective of estimating vibrational contributions to entropy and the correction of the composition - temperature phase diagram in this multi nary system. The general conclusion summarises the results which are published in 5 articles
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Narjes Beigom Mortazavi Amiri. Relations entre motifs structuraux et dynamique de réseau dans les cristaux mixtes Cu-Zn-Sn-Se : études premiers principes. Autre [cond-mat.other]. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0333⟩. ⟨tel-01750861⟩

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