Improving the electrical properties of niobium-doped titania sputtering targets by sintering in oxygen-deficient atmospheres

Niobium-doped titania (TNO) film can be used as a transparent conductive oxide (TCO) film due to its excellent conductivity and visible transparency. The performances of TNO sputtering targets are thus critical issues in optimizing sputtered films. This study clarifies the influences of inert and reducing atmospheres on the microstructure, densification, crystal structure, and electrical properties of TNO sputtering targets. The results indicate that a sintering atmosphere of 90% Ar–10% H₂ can result in a lower sintered density, larger grain size, and lower resistivity than can an atmosphere of Ar, followed by one of air. Sintering in 90% Ar–10% H₂ or Ar obviously decreases the resistivity of TiO₂, from >10⁸ Ω cm to <10⁻¹ Ω cm, and the TNO target, from >10¹ Ω cm to <10⁻¹ Ω cm. The resistivity of TNO target sintered at 1200 °C in 90% Ar–10% H₂ is as low as 1.8×10⁻² Ω cm.     

掺铌纳米ITO粉末制备及其ITO膜光电性能研究

采用均相共沉淀法制备出掺铌纳米ITO粉末,粉末经模压、高温烧结成高密度ITO靶（相对密度达99％以上）,用直流磁控溅射法制备掺铌铟锡氧化物薄膜（Indium Tin Oxides简称ITO膜）。通过样品电阻实时监测装置,研究分析了溅射成膜时电阻变化规律及真空环境等对样品光电性能的影响。采用四探针测试仪、紫外-可见分光光度计、X射线衍射（XRD）及电子能谱仪（EDX）对样品进行了测试分析,结果表明：掺铌ITO膜的电阻率最小可达到2．583×10^-4 Ω·cm,可见光范围（400—800nm）平均透过率最高可达到93％。