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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Optical and electrical properties of vanadium pentoxide xerogel films: modification in electric field and the role of ion transport
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Optical and electrical properties of vanadium pentoxide xerogel films: modification in electric field and the role of ion transport

机译：五氧化二钒干凝胶薄膜的光电性能：电场中的修饰和离子迁移的作用

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Reversible modification of the optical and electrical properties of V2O5 x nH(2)O gel films under the action of an electric field is studied. It is shown that under cathodic polarization (I = 10(-6)-10(-5) A, t similar to 10 min, film thickness similar to10 mum), the films turn from brownish-yellow to red. This internal electrochromic (EC) effect is caused by the redistribution of hydrogen ions inside the film, instead of insertion from the outside (from an electrolyte). A local increase in the hydrogen concentration occurs near the cathode, and this in turn results in modification of the optical properties. The rise of transmittance in the long-wavelength region of the spectrum, as well as the shift of the absorption edge near hnu similar to 2.5 eV towards longer wavelengths, is observed. In addition, according to the infrared data, some increase in water content also contributes to the process of colouration. The change in the optical properties is accompanied by a change in the electrical properties, namely, an increase in ionic conductivity from similar to4 x 10(-5) to 10(-4) Ohm(-1) cm(-1). At higher currents, electroforming resulting from the transport of oxygen ions occurs. This process leads to the formation of a channel consisting of vanadium dioxide due to reduction Of V2O5 to VO2. Electrical switching with the S-type negative resistance, associated with an electrothermally driven metal-insulator transition in the channel, is observed in the sandwich M/V2O5 x nH(2)O/M devices (unlike the planar devices described in the literature). Finally, applied potentialities of these phenomena for micro- and opto-electronics (EC devices, sensors) are discussed. [References: 48]
机译：研究了在电场作用下V2O5 x nH（2）O凝胶薄膜的光学和电学性质的可逆修饰。结果表明，在阴极极化下（I = 10（-6）-10（-5）A，t约等于10分钟，膜厚约等于10毫米），膜层从棕黄色变为红色。这种内部电致变色（EC）效应是由氢离子在膜内部的重新分布而不是从外部（从电解质）插入引起的。氢浓度在阴极附近局部增加，这进而导致光学性质的改变。观察到光谱的长波长区域中的透射率升高，以及类似于2.5 eV的hnu附近的吸收边缘向更长的波长移动。另外，根据红外数据，水含量的一些增加也有助于着色过程。光学特性的变化伴随着电特性的变化，即离子电导率从相似的4 x 10（-5）增加到10（-4）Ohm（-1）cm（-1）。在较高的电流下，会发生由氧离子传输引起的电铸。由于V2O5还原为VO2，此过程导致形成由二氧化钒组成的通道。在三明治M / V2O5 x nH（2）O / M器件中（与文献中描述的平面器件不同）观察到具有S型负电阻的电开关，该电开关与通道中的电热驱动金属-绝缘体过渡有关。 。最后，讨论了这些现象在微电子和光电（EC设备，传感器）中的应用潜力。 [参考：48]

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