|About this Abstract
||Materials Science & Technology 2012
||Nanotechnology for Energy, Environment, Healthcare and Industry
||Nanofabrication and Atomic-Level Characterization of Complex Oxides for Energy Application
||Riad Alzghier, Gordon Waller, Jeremiah Abiade
|On-Site Speaker (Planned)
Complex oxides are excellent candidates for use in thermoelectric (TE) energy harvesting devices. The key challenge in optimizing the TE figure of merit (ZT= S2/κ). Despite the high thermal conductivity present in most oxides the power factor (S2) of materials like doped SrTiO3 rivals that of bismuth telluride. The thermal conductivity may be drastically reduced by reducing material dimensions to the nanoscale. The complex stoichiometries of doped oxides as well as high melting temperatures make many solution and vapor phase synthesis techniques unsuitable for preparation of nanostructures. Oxide nanostructures with size on the order of 100 nm were fabricated on crystalline SrTiO3 substrates. Patterns were written into poly(methylmethacrylate) (PMMA) templates using electron beam lithography followed by deposition of 20 atm% Nb doped SrTiO3 by pulsed laser deposition. The samples were then annealed to enhance crystallinity. The fabrication approach and atomic-level characterization will be discussed in detail.