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Anatase TiO 2

GOALI: Epitaxial Growth of Perovskite Films and Heterostructures by Atomic Layer Deposition and Molecular Beam Epitaxy John G. Ekerdt, University of Texas at Austin, DMR 1006725.

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Anatase TiO 2

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  1. GOALI: Epitaxial Growth of Perovskite Films and Heterostructures by Atomic Layer Deposition and Molecular Beam EpitaxyJohn G. Ekerdt, University of Texas at Austin, DMR 1006725 We have integrated a customized atomic layer deposition (ALD) chamber with molecular beam expitaxy (MBE), allowing in-situ transfer of samples. This enables the study of epitaxial perovskite film ALD on surfaces, grown with MBE, that have different terminations and partial-to-complete layers. TTIP [Ti(O-iPr)4] and H2O were used to deposit titanium dioxide (TiO2) films using ALD. Thin ~3-4 nm c-axis oriented anatase TiO2 films prepared on SrTiO3/Si(001) with MBE are used to template the growth. Amorphous/weakly crystalline TiO2 is grown at 200°C, and after annealing the films are highly c-axis ordered anatase phase with some polycrystalline character. ALD enables the growth of technologically relevant thick films. While still too thin, the TiO2 ALD films function as photo-catalysts under ultraviolet irradiation, splitting water into hydrogen and oxygen. (LEFT) Customized ALD chamber that is designed to accept samples on the MBE stage mount, enabling in situ sample transfer and growth on well-characterized and specially prepared surfaces. (RIGHT) X-Ray Diffraction scan of a 16.5 nm TiO2 film on TiO2/STO/Si(001) MBE-grown substrate. Sample was annealed under high-vacuum conditions at 600oC for 30 min. Photocatalyst TiO2 on SrTiO3-buffered Si Anatase TiO2 O Ba STO Cross-sectional TEM of TiO2 on SrTiO3

  2. GOALI: Epitaxial Growth of Perovskite Films and Heterostructures by Atomic Layer Deposition and Molecular Beam EpitaxyJohn G. Ekerdt, University of Texas at Austin, DMR 1006725 We have continued the Demkov-initiated outreach Program Alice in Wonderland (AIW), initially funded under the NSF grant DMR-0606464. The program is aimed at attracting high-school female students to physical sciences and engineering; in collaboration with the physics instructors in local high schools, the students spend summers in research groups at the University of Texas at Austin and participate in “real science” in a supportive environment. The program has two parts, the summer camp and labs. After the summer camp is finished, the AIW participants work in their chosen research groups for a month or longer. Students learn from the hands on experience about advanced subjects such as a single spin detection, optical properties of nanoparticles, magnetic atomic force microscopy (AFM), atomic layer deposition (ALD) growth of thin films, biophysics, and first principles calculations. They interact with a large group of faculty, graduate and undergraduate students. (Top) AIW participant Jessica Paz presenting a lecture on “Experimenting with Micro-spheres”; (bottom) the 2011 AIW class

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