Li Y, Lei Y, Shen B G, Sun J R
Beijing National Laboratory for Condensed Matter &Institute of Physics, Chinese Academy of Sciences, Beijing 100190, Peoples' Republic of China.
Sci Rep. 2015 Sep 30;5:14576. doi: 10.1038/srep14576.
Strontium titanate is a model transition metal oxide that exhibits versatile properties of special interest for both fundamental and applied researches. There is evidence that most of the attractive properties of SrTiO3 are closely associated with oxygen vacancies. Tuning the kinetics of oxygen vacancies is then highly desired. Here we reported on a dramatic tuning of the electro-migration of oxygen vacancies by visible light illumination. It is found that, through depressing activation energy for vacancy diffusion, light illumination remarkably accelerates oxygen vacancies even at room temperature. This effect provides a feasible approach towards the modulation of the anionic processes. The principle proved here can be extended to other perovskite oxides, finding a wide application in oxide electronics.
钛酸锶是一种典型的过渡金属氧化物，展现出对基础研究和应用研究都具有特殊意义的多种特性。有证据表明，SrTiO₃的大多数吸引人的特性都与氧空位密切相关。因此，非常需要调控氧空位的动力学。在此，我们报道了通过可见光照射对氧空位电迁移进行的显著调控。研究发现，通过降低空位扩散的活化能，光照即使在室温下也能显著加速氧空位迁移。这种效应为调控阴离子过程提供了一种可行的方法。这里证明的原理可以扩展到其他钙钛矿氧化物，在氧化物电子学中有着广泛的应用。
