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首页> 外文期刊>RSC Advances >Spectroscopic ellipsometry for compositionally induced bandgap tuning of combinatorial niobium-tantalum anodic oxides
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Spectroscopic ellipsometry for compositionally induced bandgap tuning of combinatorial niobium-tantalum anodic oxides

机译：用于组合物诱导的组合铌 - 钽氧化物氧化物的带隙调谐的光谱椭圆形测定法

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摘要

Variable angle spectroscopic ellipsometry (VASE) was used for optical property mapping of anodic oxides grown on a wide spread Nb-Ta thin film combinatorial library (Nb content ranging between 8 and 84 at%) with 2 at% resolution. The microstructure of the parent metal alloys was tuned by modifying the library deposition conditions in order to avoid compositionally induced microstructure dissimilarities between the alloys. This allowed an interpretation of the mixed oxides properties based on a single Tauc-Lorentz oscillator for data fitting. Upon anodization up to 10 V vs. SHE, VASE was used to fit the oxide thickness in order to map the oxide formation factors with the results showing a good agreement with the electrochemical data. The measured bandgap values of the Nb-Ta oxides show a deviation from the linear model based on mixing individual Nb and Ta electronegativities proportional to their atomic fractions. This behavior was explained via an in-depth compositional gradient in the oxides. Minority species are depleted at the metal/oxide interface triggering a non-linear shift in the resulting alloy electronegativity. The Nb-Ta mixed oxides bandgap tuning via compositional tuning of the parent metal has been demonstrated and absorption close to the edge of the visible spectrum was identified above 30 at% Nb.
机译：可变角度光谱椭圆形测定法（Vase）用于在宽的Nb-Ta薄膜组合文库中生长的阳极氧化物的光学性质映射（Nb含量在8和84at％之间），以2at％分辨率。通过改变文库沉积条件来调节母金属合金的微观结构，以避免合成的合成诱导的合金之间的微观结构差异。这允许基于单个Tauc-LorentZ振荡器对混合氧化物性能的解释进行数据配件。在阳极氧化高达10 V与她，使用Vase来适合氧化物厚度，以便将氧化物形成因子与电化学数据吻合良好。 Nb-Ta氧化物的测量带隙值显示了基于与其原子级分成比例的单独Nb和Ta电酮的线性模型的偏差。通过氧化物中的深入组成梯度解释该行为。在金属/氧化物界面处耗尽少数群体物种触发所得合金电阻的非线性偏移。已经证明了通过组合物调整的Nb-Ta混合氧化物带隙调节，并且靠近可见光谱边缘的吸收在30b下鉴定在30b中以上。

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  • 来源
    《RSC Advances》 |2016年第83期|共9页
  • 作者

    Limberger Wolfgang; Mardare Cezarina Cela; Cobet Christoph; Zuo Juan; Hassel Achim Walter; Mardare Andrei Ionut;

  • 作者单位

    Johannes Kepler Univ Linz Inst Chem Technol Inorgan Mat Altenberger Str 69 A-4040 Linz Austria;

    Johannes Kepler Univ Linz Inst Chem Technol Inorgan Mat Altenberger Str 69 A-4040 Linz Austria;

    Johannes Kepler Univ Linz Inst Chem Technol Inorgan Mat Altenberger Str 69 A-4040 Linz Austria;

    Xiamen Univ Technol Sch Mat Sci &

    Engn Inst Adv Energy Mat 600 Ligong Rd Xiamen 361024 Fujian Peoples R China;

    Johannes Kepler Univ Linz Inst Chem Technol Inorgan Mat Altenberger Str 69 A-4040 Linz Austria;

    Johannes Kepler Univ Linz Inst Chem Technol Inorgan Mat Altenberger Str 69 A-4040 Linz Austria;

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  • 正文语种 eng
  • 中图分类 化学;
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