采用射频反应磁控溅射法在镀有SiO2膜的钠钙硅玻璃基片上沉积了二氧化钒(VO2)薄膜.研究了在300℃沉积温度下,不同溅射时间(5～35min)对VO2薄膜结构和性能的影响.用X射线衍射、扫描电镜、自制电阻测量装置、紫外-可见光谱仪、双光束红外分光光度计对薄膜结构、形貌、电学及光学性能进行了表征.结果表明:薄膜在低温半导体相主要以四方相畸变金红石结构存在,在(011)方向出现明显择优取向生长,随着溅射时间的延长,晶粒生长趋于完整,晶粒尺寸增大;对溅射时间为35 min的薄膜热处理,发现从室温到90℃范围内,薄膜方块电阻的变化接近3个数量级;由于本征吸收,薄膜在可见光范围透过率较低,且随膜厚的增加而逐渐降低;在1500～4000 cm-1波数范围内,原位测量薄膜样品加热前后(20和80℃)的红外反射率,发现反射率的变化幅度随着膜厚增加而提高,最高可达59%.
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