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Electrical Contact to a Transparent Conductor: Gallium Oxide

Electrical Contact to a Transparent Conductor: Gallium Oxide Marjorie A. Olmstead, University of Washington, DMR 1104628 am. Issue: Forming a bi-directional metal contact to Ga 2 O 3 Science: Metal – oxide reaction controls interface current

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Electrical Contact to a Transparent Conductor: Gallium Oxide

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  1. Electrical Contact to a Transparent Conductor: Gallium Oxide Marjorie A. Olmstead, University of Washington, DMR 1104628 am Issue: Forming a bi-directional metal contact to Ga2O3 Science: Metal – oxide reaction controls interface current Best Option: Ti. Low work function, forms lower band gap oxide Nanoscopic Mechanism: Measure interface reaction with electron spectroscopy Empty states Large Work Function No states Energy  vacuum Macroscopic Response: Measure current-voltage characteristics Filled states Ga2O3 oxide metal Ga2O3 Ga2O3 Ni Pd For current to flow, electrons in filled states need empty states to move into,also, no energy barriers in either direction. Ni Pd Ni Pd Forward Bias Current Flow Reverse Bias No current No Reaction (Al,Ga)2O3 Ga2O3 Ni and Pd Less stable oxide than Ga – No Reaction Large work function – Rectifying Contact Ti and Al: More stable oxide than GA – Reaction Small work function – Contact depends on reacted oxide Smaller gap TiO2 –bi-directional current Larger gap Al2O3 – Rectifying, lower barrier than Ni TiO2 Ga2O3 Ti-Ga

  2. Community Engagement at Home and Abroad Marjorie A. Olmstead, University of Washington, DMR 1104628 Elementary Math and Engineering Club NSF P. I. Olmstead mentors high school students to organize and run a weekly “Math and Engineering” club at their former elementary school in conjunction with the Seattle Parks and Recreation Department. The thirty 90-minute sessions ranged from logic puzzles to hovercrafts, all using inexpensive, easily obtained materials. The teens taught principles of engineering design and mathematical concepts to 3rd – 5th graders, while also serving as role models. Above: Students perfect their ping-pong ball catapults with their high school mentor Japanese Teens Experience US Campus & Research Below: Visiting Japanese students with their new American friends. Visiting pulsed laser deposition laboratory Twenty STEM high school students from the Midorigaoka High School, Japan, visited UW-Materials Science and Engineering in January 2012, as a part of the 2011 Japan’s Earthquake Recovery Act. NSF Co-P.I. Fumio Ohuchi hosted their visit to his laboratories, and gave a lecture on NSF-sponsored research.

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