The Condensed Matter & Surface Sciences Colloquium Series presents Dr. Farida Selim on “ Control and Characterization of Multifunctional Oxide Semiconductors” on Thursday, Oct. 9, at 4:10 p.m. in Walter Lecture Hall 245.
Abstract: Oxide semiconductors exhibit a range of novel physical phenomena that make them perfect candidates for fundamental research and applications as device materials. Their electronic and photonic properties strongly depend on their size, structure and defects. Advancing instrumentation is thus essential to develop new multifunctional oxides and promote research capabilities in materials and devices. In fact, fundamental and applied research of oxides has been greatly advanced by rapid development in nanoscale synthesis and characterization methods.
In our laboratory, we combine advanced positron annihilation spectroscopy and novel luminescence techniques with conventional structural, electrical and optical characterization methods to study oxide semiconductors and develop them for optoelectronic and semiconductor devices. These newly developed techniques combined with positron annihilation and other conventional characterization methods provide a unique and nearly ideal combination for investigation of defects and electronic and photonic properties.
In this talk I will discuss the basics of advanced positron annihilation spectroscopy and describe new luminescence based methods we have recently developed for electronic and photonic characterization of luminescent semiconductors. Then I will demonstrate their use to study a few semiconductors and discuss recent discovery and developments on two interesting oxide systems, SrTiO3 and ZnO.
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