Turning optical switching properties of Mg-Y films in electrochemical process by tailoring composition
Turning optical switching properties of Mg-Y films in electrochemical process by tailoring composition
复制标题
通过调整成分来改变电化学过程中 Mg-Y 薄膜的光学开关特性
DOI：
10.1088/2053-1591/aab6a1
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发表时间：
2018
影响因子：
2.3
通讯作者：
Li Xingguo
中科院分区：
文献类型：
--
作者：
Fu Kai;Chen Jun;Deng Jifeng;Li Shuan;Guo Yanru;Tian Wenhuai;Li Xingguo
采用直流磁控共溅射法制备了一系列Pd包封的Mg-Y二元薄膜，并对其光开关性能和电化学电位分布进行了研究。在氢化状态下，Mg-Y/Pd薄膜的最大透过率与Mg-Y比无关。发现薄膜的相组成和晶粒尺寸对Mg-Y薄膜的电致变色性能有很大的影响。只要薄膜中存在Mg颗粒，由于这些金属Mg在充电过程中难以完全氢化并保持高反射状态，因此透光率很低。在原始薄膜中形成金属间化合物（即mg24y5、mg2y和MgY）是实现氢化态高透光率的关键和有利条件。在这些只含金属间化合物的样品中，原位生成的Mg畴尺寸很小，并被yh2畴包围。yh2畴提供了快速的氢扩散路径、充足的氢源和成核剂，再加上Mg畴尺寸小，使得薄膜氢化完全。
A series of Pd capped Mg-Y binary thin films have been prepared by direct current magnetron co-sputtering and their optical switching properties combined with electrochemical potential profiles have been investigated. The maximum optical transmittance of Mg-Y/Pd thin films in the hydrogenated state, are not positively related to the Mg-Y ratio. The phase composition and grain size of the thin films have been found to greatly affect the electrochromic properties of Mg-Y thin films. As long as Mg particles is present in the thin film, the optical transmittance remains low as these metallic Mg are hard to completely hydrogenated and maintain highly reflective state in charging process. Forming intermetallic (ie Mg 24 Y 5, Mg 2 Y and MgY) in pristine thin films is crucial and favorable to achieve high optical transmittance in the hydrogenated state. In these samples containing intermetallic only, the in situ generated Mg domains have very small size and are surrounded by the YH 2 domain. The YH 2 domains provide fast H diffusion path, sufficient hydrogen source and nucleating agents, which, together with the small Mg domain size, results in complete hydrogenation of the thin films.