Insight into the enhancement of transport property for oriented La 0.9 MnO 3 films

作者：Changzheng Xie, Lei Shi, J. F. Zhao, Shiming Zhou, Yang Li, Jianhui Guo · 发表于：Journal of Physics D Applied Physics · 年份：2017 · DOI：10.1088/1361-6463/aa6b4a · 被引用次数：11 · 研究领域：Magnetic and transport properties of perovskites and related materials、Rare-earth and actinide compounds、Electronic and Structural Properties of Oxides

Abstract LaMnO 3 has attracted significant attention as energy conversion and storage materials, and especially as a promising noble-metal-free oxide catalyst and a new kind of electrode material for supercapacitors. However, the poor electronic transport ability of LaMnO 3 hinders its application. Thus, improvement of its electronic transport ability is essential to enhance the electron transfer from catalyst active sites to an electrode, which is effective to avoid ohmic potential drop and consequently energy loss. In this work, the high-quality epitaxial growth La-deficiency La 0.9 MnO 3 films were obtained by a simple and low cost polymer assisted deposition method. It is found that the room-temperature conductivity ( σ ) of doping La 0.9 MnO 3 increases nearly ten times compared to that of the parent LaMnO 3 . The oxygen-content-driven enhancement of the conductivity is discussed for the oriented La 0.9 MnO 3 film. It is suggested that the existence of the LaAlO 3 substrate is beneficial to stabilize the La-deficiency La 0.9 MnO 3 compound and A-site La-deficiency extends the range of oxygen content. Both strain (including epitaxial strain and doping induced chemical strain) and annealing temperature are cooperating on the oxygen content, resulting in the oxygen stoichiometry independence of ambient conditions and the high conductivity. Following this process, conductivity and electronic state of the perovskite-related material can be tuned for the practical application.