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Publication Citation: Structural and thermoelectric properties of Bi2Sr2Co2Oy thin films on LaAlO3 (100) and fused silica substrates

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Author(s): Winnie K. Wong-Ng; Mark D. Vaudin; Shufang Wang; L Venimadhav; Shengming Guo; Ke Chen; Qi Li; A Soukiassian; D.G. Schlom; X.Q. Pan; D.G. Cahill; X. X. Xi;
Title: Structural and thermoelectric properties of Bi2Sr2Co2Oy thin films on LaAlO3 (100) and fused silica substrates
Published: January 12, 2009
Abstract: We have grown Bi2Sr2Co2Oy thin films on LaAlO3 (100) and fused silica substrates by pulsed laser deposition. The films on LaAlO3 are c-axis oriented and partially in-plane aligned with multiple domains while the films on fused silica are preferred c-axis oriented without in-plane alignment. The Seebeck coefficient and resistivity of films on both substrates are comparable to those of single crystals. A large nonlinear resistivity related to the suppression of the spin density wave by external electric field was also observed. An oxide p-n heterojunction was formed by depositing Bi2Sr2Co2Oy film on Nb-doped SrTiO3 single crystal, which showed a rectifying behavior. These thin films and heterostructures may be used for novel thermoelectric applications.
Citation: Applied Physics Letters
Volume: 94
Issue: 2
Keywords: Bi2Sr2Co2Oy films on LaAlO3 (100); texture, thermoelectric properties, PLD, oxide p-n junction
Research Areas: Energy Conversion, Storage, and Transport, Energy