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Thursday, August 14 • 14:30 - 16:30
Wide Band Gap III

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14:30-14:45

Oral: Alex Dolgonos
Optoelectronic Properties of the Tetragonal-Phase n-type Transparent Conductor in the Gallium-Indium-Tin-Oxide System
Co-authos: Kanber Lam, Kenneth Poeppelmeier, Arthur Freeman, Thomas Mason

14:45-15:00
Oral: Laszlo Frazer
Photon/Exciton-Polariton Scattering Cross Section in Cuprous Oxide
Co-authors: Kelvin Chang, Kenneth Poeppelmeier, John Ketterson

15:00-15:30
Invited: Jörg Weber
Hydrogen Induced Defect Reactions in ZnO
Co-authors: N/A

Hydrogen is an amphoteric impurity in most semiconductors which compensates the electrical activity of dopants. In contrast, atomic hydrogen in ZnO is a shallow donor, which is one of the reasons of the inadvertent n-type conductivity of ZnO samples. We will report on the identification of hydrogen induced shallow effective-mass like donors. In agreement with theory, we identify hydrogen at the bond center position along the c-axis and at the center of the oxygen vacancy. Due to the fast diffusion of hydrogen in ZnO several other hydrogen related defects are formed. A dominant, yet elusive defect is the hydrogen molecule H2, a freely rotating molecule on interstitial sites in the lattice. We will discuss the formation of this neutral defect and its interaction with the lattice. New results on the ortho-para H2 conversion rate will be discussed. The behavior of H in ZnO is contrasted with the properties of this impurity in other semiconductors.

15:30-15:45
Oral: Leonard Brillson
Native Point Defect Energies, Densities, & Electrostatic Repulsion Across MgZnO Alloys
Co-authors: James Perkins, Meredith Meyer, Jean Michel Chauveau, Andrés Redondo-Cubero, Adrian Hierro, Wolfgang Windl

15:45-16:00
Open

16:00-16:15

Oral: Kentaro Kaneko
Room Temperature Ferromagnetism in Alpha-(Ga,Fe)2O3 Semiconductor
Co-authors: Shigenori Ueda, Shizuo Fujita

16:15-16:30
Oral: Rüdiger Schmidt-Grund
NIR-VUV Dielectric Function of (In,Ga)2O3 Thin Films 
Co-authors: Hannes Krauß, Tammo Böntgen, Christian Kranert, Holger von Wenckstern, Jörg Lenzner, Marius Grundmann 

Session Chairs
KJ

K. J. Chang

Korea Advanced Institute of Science & Technology

Speakers
JW

Jörg Weber

Professor & Chair of Semiconductor Physics, TU Dresden
Prof. Jörg Weber is Chair of Semiconductor Physics at TU Dresden since December 1999. He is engaged in the study of impurities and defects in various semiconductors. His present area of specialization is the study of hydrogen in various hosts and its importance in device technology. | | Prof. Jörg Weber was dean and vice rector, coeditor of several special issues of "Applied Physics", and chaired and co-chaired several meeting... Read More →


Thursday August 14, 2014 14:30 - 16:30
Room 17B

Attendees (9)