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Diana Huffaker, California NanoSystems Institute4:00 p.m
March 12, 2009
Tech L324
Dr. Diana Huffaker, Associate Professor,
California NanoSystems Institute (CNSI),
Electrical Engineering Department,
University of California at Los Angeles
"Integrated Nanomaterials for Optoelectronic Devices" | Abstract: We overview several research areas involving controlled atomic assembly in highly lattice-mismatched semiconductor material systems. Our technologies include both patterned and self-assembled nanostructure synthesis along with monolithic integration of lattice-mismatched bulk materials. The patterned approach to quantum dot (QD) and nanopillar (NP) formation is unique compared to catalyzed synthesis in that we employ selective area epitaxy on a masked substrate for directed nucleation. The resulting QDs and NPs are highly crystallographic and good optical quality with emission wavelengths ranging from 830 nm to 1.6 µm. Pattern registration enables subsequent lithographic device design and integration. Our current scientific challenges involve understanding the ternary material composition, carrier transport and surface state passivation. Our second area of interest, involving atomic assembly, produces very high quality bulk material in lattice-mismatched systems including III-Sb on GaAs and Si substrates (Dao/ao= 8% - 13%). Interfacial strain energy is alleviated by a uniform, coherent 2-D array of 90˚ defects or interfacial misfit array (IMF). These techniques have allowed us to demonstrate III-Sb lasers on Si and GaAs substrates. Important applications include high- and low power emitters, thermophotovoltaics, focal plane array, and solar cells.
Bio:
Professor Diana Huffaker received her Ph.D. in Electrical Engineering from the University of Texas at Austin with dissertation studies focused on vertical cavity microlasers and quantum dot devices. Prior to joining the University of California at Los Angeles, she was Associate Professor of Electrical Engineering at the University of New Mexico, Center for High Technology Materials. She has also served as Senior Research Scientist at Picolight Incorporated in Boulder, CO. Her research interests include directed and self-assembled nanostructure solid-state epitaxy, optoelectronic devices for energy and biosensing applications with special emphasis in extreme lattice mismatched such as III-V/Si photonics. Professor Huffaker has co-authored over 130 refereed journal publications and has reported her work through many invited presentations. Awards include NSSEFF Fellowship 2008, IEEE Fellow 2008, 2004 Alexander von Humboldt research fellowship at Technical University Berlin, 2002 Compound Semiconductor International Symposium Young Scientist Award. She is an active volunteer in the technical community with leadership responsibilities in IEEE/LEOS, SPIE, WIE, OSA and TMS.
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