Control of physical properties by means of photocarrier injection

利用光载流子注入（PCI）的方法控制氧化膜的物理性质。在VO_2/TiO_2（001）体系中，由于固溶体是在薄膜与衬底之间的界面处形成的，因此采用PCI法控制其物理性能的关键是形成一个锋利的界面。在紫外光照射下，SnO_2体系的电阻发生了较大的变化。我们已经开发了我们将应用PCI方法的材料。我们开发了一种制备方法，成功地获得了高质量的CrO_2薄膜，并在室温下发现了荷兰酸型氧化钛化合物的铁磁性。

We have aimed to control the physical properties of oxide films by using photocarrier injection (PCI) method. In VO_2/TiO_2(001) system, it is found that making a sharp interface is important to control the physical properties by PCI method, because the solid solution is formed at the interface between the film and the substrate. In SnO_2 system, a large change in resistance is observed under an ultraviolet light irradiation. We have developed the materials to which we would apply the PCI method. We have successfully obtained a high quality CrO_2 thin film by developing a preparation method and also found a room temperature ferromagnetic behavior in hollandite-type Ti oxide compounds.