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Atom Probe Tomography Analysis Patrick Kung, University of Alabama Tuscaloosa, DMR 0907558

Atom Probe Tomography Analysis Patrick Kung, University of Alabama Tuscaloosa, DMR 0907558.

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Atom Probe Tomography Analysis Patrick Kung, University of Alabama Tuscaloosa, DMR 0907558

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  1. Atom Probe Tomography AnalysisPatrick Kung, University of Alabama Tuscaloosa, DMR 0907558 Atom Probe Tomography is an emerging technique for the nanoscale characterization of semiconductors, which has the unique ability to identify and map the positions of individual atoms from a specimen with 3-D atomic resolution. This technique is ideally suited for investigating the presence of phase segregation or composition fluctuation in electronic and photonic materials (e.g. for AlInN where such phenomena are expected to occur because of the combination of constituent InN and AlN with very diverse thermodynamics characteristics), as well as dopant distribution in semiconductors. In this project, we have developed and gained deeper understanding of the atom probe tomography measurement technique and data analysis/interpretation for wide bandgap semiconductor ZnO. Scanning electron micrograph (top left), and reconstructed images based on data collected from atom probe measurements from a ZnO semiconductor nanowire. The reconstructions show the uniform distribution of constituent atoms (right) in the specimen probed, along with dopant atoms (bottom left, highlighted in yellow).

  2. Outreach to Underrepresented GroupsPatrick Kung, University of Alabama Tuscaloosa, DMR 0907558 During Summer 2011, a high school student (M. Tempero), an undergraduate student (J. Waters), and an HBCU faculty (Prof. T. Bryant from Virginia State Univ.), all African-American, have participated in a research experience on semiconductor material growth and characterization with the PI and co-PI. This helped recruit J. Waters into a Ph.D. in Materials Science at UA with the PI. He is starting this Fall 2011. PI and co-PI were instructors in a NSF sponsored workshop for HBCU faculty and teachers (entitled “Introducing Science Faculty to Materials Science and Engineering”), which was held May 29-Jun. 17, 2011. From left to right: Joseph Waters, Michael Tempero, and Prof. Tony Bryant preparing a sample in the PI’s laboratory. PI and co-PI after being instructors in a NSF sponsored workshop for HBCU faculty members in June 2011.

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