Investigation of long-lived photo-induced process in photorefractive crystals of the sillenite group and their applicatio [Elektronische Ressource] / Andrew Matusevich. Gutachter: Richard Kowarschik ; Hartmut Bartelt ; Vasilij Shepelevich

Investigation of long-lived photo-induced processes in photorefractive crystals of the sillenite group and their application Dissertation zur Erlangung des akademischen Grades doctor rerum naturalium (Dr. rer. nat.) vorgelegt dem Rat der Physikalisch-Astronomischen Fakultät der Friedrich-Schiller-Universität Jena von Diplom-Physiker Andrew Matusevich geboren am 24. Juli 1984 in Minsk (Weißrussland) Gutachter: 1. Prof. Dr. Richard Kowarschik 2. Prof. Dr. Hartmut Bartelt 3. Prof. Vasilij Shepelevich Tag der öffentlichen Verteidigung : 05. 04. 2011 Contents 1 Introduction and Aims 3 1.1 3 1.2 Aims 5 2 Nature of photo-induced processes in photorefractive crystals 7 2.1 Impurity light absorption of semiconductor compounds 8 2.1.1 Photoinonization of shallow impurities 9 2.1.2 Photoexcitation shallow impurities 11 2.1.3 Photoneutralization of shallow impurities 12 2.1.4 Photoionization and photoneutralization of deep impurities 12 2.1.5 Intracenter transition 13 2.1.6 Bond exciton absorption 14 2.1.7 Absorption at local vibrations of impurities 14 2.2 Single-level model 15 2.3 Two-level m 20 2.4 Charge spatial transport mechanisms in photorefractive semiconductor media 23 2.4.1 Diffusion 23 2.4.2 Drift 26 2.4.3 Photovoltaic mechanism 28 2.