The Sponsored Funding Report for September:
N.C. A&T received 27 grants totaling $4.45 million in September.
One highlight of September’s funding was a grant worth $563,497 from the Army Research Office to Dr. Shanthi Iyer of the Department of Nannoengineering. Dr. Iyer is on the faculty of both the College of Engineering and the Joint School of Nanoscience and Nanoengineering.
The project: A Study of GaAsSb Nanowires by Molecular Beam Epitaxy for near IR Applications
The issue: The inherent one dimensionality of semiconductor nanowires (NWs) allows them to exhibit unique properties that can be exploited to engineer novel electronic and optoelectronic devices. Benefits include potentially inexpensive, flexible, tunable LEDs and lasers, which are not easily obtainable in thin film devices, in the infrared regime for infrared countermeasures and gas sensing applications, as well as integration with silicon based microelectronics for novel optoelectronic device structures.
Abstract: In this research program, we propose to study the synthesis of catalyst-free GaAsSb-based heterostructure NWs grown by molecular beam epitaxy (MBE), building upon an existing program and expertise in MBE growth of mixed arsenide-antimonide dilute nitride semiconductors at North Carolina A&T State University (NCA&TSU). The influence of growth parameters on the physical attributes of the NW heterostructures, defects in the NWs and interfaces and the resultant photoluminescence (PL) intensity will be used to develop fundamental knowledge. Emphasis will be on a better understanding and manipulation of the defects in the NWs and interfaces, leading to defect free heterostructure devices with superior structural and optoelectronic properties. Effects of the AlGaAs confinement layers radially and axially on the PL peak emission and its dependence on the NW diameter will be studied. The maximum Sb composition that can be used before the miscibility gap sets in will be determined and the synthesis of corresponding dilute nitride NWs will be examined.
The successful completion of the above work is expected to lead to novel, next-generation and inexpensive multifunctional optical devices in the near infrared regime for defense applications. The investigators from NCA&TSU and North Carolina State University (NCSU) have significant expertise in the areas of material growth and characterization, share the same vision, have a history of involving undergraduates in state-of-the-art research and bring complimentary resources to the table. The laboratories will provide an excellent training ground for the students to the state-of-the-art material synthesis and characterization, and provide a natural entry into the nanostructure community at large from other universities, government labs and industry.