Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000 Roskilde, Denmark.
Nano Lett. 2011 Sep 14;11(9):3774-8. doi: 10.1021/nl201821j. Epub 2011 Aug 10.
The conductance confined at the interface of complex oxide heterostructures provides new opportunities to explore nanoelectronic as well as nanoionic devices. Herein we show that metallic interfaces can be realized in SrTiO(3)-based heterostructures with various insulating overlayers of amorphous LaAlO(3), SrTiO(3), and yttria-stabilized zirconia films. On the other hand, samples of amorphous La(7/8)Sr(1/8)MnO(3) films on SrTiO(3) substrates remain insulating. The interfacial conductivity results from the formation of oxygen vacancies near the interface, suggesting that the redox reactions on the surface of SrTiO(3) substrates play an important role.
在复杂氧化物异质结构的界面处限制的电导为探索纳米电子学和纳米离子学器件提供了新的机会。在此，我们表明，基于 SrTiO3 的异质结构可以实现金属界面，这些异质结构具有各种非晶 LaAlO3、SrTiO3 和氧化钇稳定氧化锆薄膜的绝缘覆盖层。另一方面，在 SrTiO3 衬底上的非晶 La(7/8)Sr(1/8)MnO3 薄膜样品仍然是绝缘的。界面处的电导率源于界面附近氧空位的形成，这表明 SrTiO3 衬底表面的氧化还原反应起着重要作用。
