Haller Group Members
Graduate Students
	Rebecca Jones B.S.E. Electrical Engineering, Princeton University (2002) M.S. Materials Science and Engineering, University of California-Berkeley beccaj AT berkeley DOT edu	Becca is a fifth year graduate student in Materials Science and Engineering interested in solar cells and photoelectrochemical water-splitting. Her research involves the electrical, optical and electrochemical characterization of the InGaN and InAlN alloys, with a focus on understanding the defect behavior that dominates electrical transport in these materials. Outside of the lab, Becca is involved with campus environmental organizations, and enjoys playing sports, being outdoors, and reading.
	Yabing Qi B.S. in Physics, Nanjing University (2000) M.Phil. Physics, The Hong Kong University of Science and Technology (2002) yabingqi AT berkeley DOT edu	Yabing's research focuses on the relationship between the electronic and mechanical properties of organic molecular monolayers prepared with self-assembly or Langmuir-Blodgett methodology. His research answers the key question: "how the intermolecular interaction influences the charge transport mechanism in molecular monolayers", which will provide a guideline to tailor the molecules for applications such as organic thin film transistors, organic light emitting diodes, and organic photovoltaic cells etc., as well as benefit the understanding of electron tunneling in general.
	Christopher Liao B.S. Materials Science and Engineering, Mechanical Engineering, University of California-Berkeley M.S. Materials Science and Engineering, University of California-Berkeley cyliao AT lbl DOT gov	Chris is a fifth year graduate student studying diffusion in SiGe alloys.  He uses isotopically enriched SiGe multilayer structures to study dopant and self-diffusion simultaneously.  By doing so, diffusion coefficients, charge state of defects involved, and diffusion mechanisms can be determined at the same time.  He has also worked on the growth of isotopically enriched Si polycrystals from silane reactor.
	Swanee Shin B.S. Materials Science and Engineering, Seoul National University (2003) M.S. Materials Science and Engineering, University of California-Berkeley (2006) sjshin AT berkeley DOT edu	Swanee Shin is a graduate student working on formation and properties of alloy nanocrystals. Currently, he is exploring size-dependent thermal, electrical, and optical properties of GeSn alloy nanocrystals in SiO2 matrix. His interests other than lab works include Christianity, sports, movies, sightseeing, and good fooood.
	Nate Miller B.S. Materials Science and Engineering, Case Western Reserve University (2005) natemiller AT berkeley DOT edu	Nate is a third year graduate student working primarily on fundamental studies of novel materials for high efficiency photovoltaics, especially InN and its alloys. Currently he is working on thermoelectric properties as a means of characterizing p-type nitride materials. When he isn't thinking about thermopower, he is usually fishing, snowboarding, or fishing.
	Robert Broesler B.S. Applied Physics, Columbia University (2005) M.S. Materials Science and Engineering, University of California-Berkeley (2007) rbroesler AT berkeley DOT edu	Rob is a third year graduate student in Materials Science and Engineering and is in his first year with the Haller group.  He received his Master's working with Prof. Ron Gronsky on microstructural characterization of superelastic CuAlNi with TEM.  He currently works with nitride semiconductors and highly mismatched alloys for photovoltaic applications, concentrating on optical properties of nitride alloys and carrier kinetics in alloyed systems.  When not in lab he enjoys snowboarding, hiking, reading, ultimate Frisbee, squash, traveling and telling himself he should explore San Francisco more.
	Derrick Speaks B.S. Materials Science and Engineering, University of Washington dspeaks AT berkeley DOT edu	Derrick is a third year MSE graduate student. He currently conducts research under Dr. Walukiewicz and Professor Haller in the Solar Energy Materials Research Group, as well as Professor Mao in Mechanical Engineering. His current research area is investigating highly mismatched alloys of Si-C and group VI dopants in ZnO. Outside the lab Derrick enjoys hiking, judo and fencing.
	Julian Guzman B.S. Materials Science and Engineering, University of Florida (2007) julianguzman AT berkeley DOT edu	Julian's current research includes structural and optoelectronic characterization of Ge nanocrystals and Ge nanocrystal alloys for possible memory and communication applications. As an undergraduate student, he investigated dielectric, ferroelectric, and piezoelectric properties of complex oxides. In addition, he determined the equilibrium phase diagram of the Al2O3-Bi2O3_Nb2O5 system at the National Institute of Standards and Technology (NIST).
	Marie Mayer B. S. Materials Science and Engineering, University of Illinois at Urbana-Champaign (2007) mamayer AT berkeley DOT edu (webmistress)	Marie is a first year Materials Science and Engineering graduate student working on solar energy applications for semiconductor materials.  Currently she is exploring the surface behavior of nitride alloys and electrical contact options, as well as working with Becca on photoelectrochemical cells.  Her undergraduate work included studying Cu(In, Ga)Se2 with STM and photoluminescence, searching for structural relations to electronic properties. When she's not in the lab, Marie enjoys traveling, reading, hiking, ultimate frisbee, and rock climbing.
Return to Haller Group Home Page updated 31 January 2008.