Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 63: II-VI-Compounds

HL 63.9: Vortrag

Mittwoch, 16. März 2011, 18:00–18:15, POT 151

Infrared absorption study of hydrogen shallow donors in rutile TiO₂ — •Frank Herklotz, Eduard Lavrov, and Jörg Weber — Technische Universität Dresden, 01062, Dresden, Germany

An IR absorption study of hydrogen-related defects in rutile TiO₂ has been performed. The previously reported O–H vibrational mode at 3288 cm⁻¹ [1] is found to consist of two components. The modes are assigned to an acceptor-hydrogen complex of an unidentified acceptor and a hydrogen located in the open c-channels [2,3]. The latter is split into two modes due to the neutral and positively charge states of the defect. Based on the temperature dependence of the stretch mode intensities we identify this defect as a shallow donor with an ionization energy of 10 meV. The effective mass of electrons in the conduction band of TiO₂ is found to be 17m_e.

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