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• W2910737477 abstract "The description of charge transport phenomena in polar oxide materials has up to now numerous unclear points, unlike for what happens for semiconductors and conductors where the band model explain exhaustively their properties. First studies on ionic insulators highlighted the necessity to introduce new concepts and a new transport theory, without which it would not be possible to explain convincingly the photo-electrical behaviour of these materials. One of these key concepts is the polaron, introduced the first time by L. D. Landau in 1933, to explain some new properties exhibited by alkali halide. A strong electron - phonon interaction characterizes these materials thanks to which the electron can induce a local distortion through Coulombian interaction. This mechanism produces a potential well localizing the electron. A polaron can be thought as a quasi-particle composed by a charge auto-localized and the relative lattice distortion that moves as a whole. Under particular conditions, it can move by thermally assisted hopping, diffuse in the material or be trapped by point defects having an attractive potential. Moreover, the polaron constitutes a localized state in the band gap, which can absorb the light releasing the trapped charge to higher energy levels. The coexistence of all these processes, under specific conditions of illumination and temperature, determine the light-induced charge transport phenomena, which are the object of this thesis. The material chosen for this research is lithium niobate (LiNbO3). Besides its technological interest, since it is largely applied for nonlinear optic and holography, it is a prototype system for polaron study, among similar polar oxides. Another advantage provided by this material is that its electrical transport properties can be studied in a convenient way via optical measurements. The purpose of this study is the creation of a predictive model describing transport properties of the material starting from its microscopic composition and the external experimental conditions to which it is exposed. We performed a set of experiments on a series of well-characterized samples and compared them with the results of numerical modelling. The main results are a quantitative estimate of some poorly known microscopic polaron parameters and, by consequence, the development of a quantitative numerical tool able to predict the behaviour of the material, in a wide range of temperature and compositions. Several new ideas concerning a semi-analytical modelling for this system were also developed and tested, together with some interesting concepts for future research, traditionally not applied in lithium niobate community, such as the physics of anomalous diffusion of polarons among a disordered defect network." @default.
• W2910737477 created "2019-01-25" @default.
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• W2910737477 date "2018-01-06" @default.
• W2910737477 modified "2023-09-23" @default.
• W2910737477 title "Microscopic Insights in Photo-Induced Charge Transport in Fe:LiNbO3" @default.
• W2910737477 hasPublicationYear "2018" @default.
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