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首页> 外文期刊>Physica, B. Condensed Matter >Effect of some preparative parameters on optical properties of spray deposited iridium oxide thin films
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Effect of some preparative parameters on optical properties of spray deposited iridium oxide thin films

机译：制备参数对喷涂氧化铱薄膜光学性能的影响

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摘要

Optical properties of iridium oxide films fabricated by the spray pyrolysis technique (SPT) have been investigated. The transmission and reflection spectra of the sprayed films were measured by using a double-beam spectrophotometer in the wavelength range from 200 to 2500nm. Influences of the preparative parameters; namely, Substrate temperature (350-500 degrees C) and solution molarity (0.005-0.03 M), on the optical characteristics were examined. The solution molarity of the iridium chloride solution was varied so as to prepare iridium oxide thin films with thicknesses ranging from 160 to 325 nm. Some important characteristics of optical absorption, such as optical dispersion energies, the dielectric constant, the ratio of the number of charge carriers to the effective mass, the single oscillator wavelength, and the average value of the oscillator strength, were evaluated. The value of the refractive index was found to depend on the chemical composition as well as the degree of stoichiometry of IrO2. The values obtained for the high frequency dielectric constant through two procedures are in the range of 2.8-3.9 and 3.3-4.6 over the relevant ranges of the substrate temperature and solution molarity, respectively. Analysis of the energy dispersion curve of the absorption coefficient indicated a direct optical transition with the bandgap energy ranging between 2.61 and 2.51 eV when the substrate temperature increases from 350 to 500 degrees C.
机译：研究了通过喷雾热解技术（SPT）制备的氧化铱膜的光学性能。通过使用双光束分光光度计在200至2500nm的波长范围内测量喷涂膜的透射和反射光谱。制备参数的影响;即，检查基板温度（350-500℃）和溶液摩尔浓度（0.005-0.03M），关于光学特性。改变氯化铱溶液的溶液摩尔比，以制备厚度范围为160至325nm的氧化铱薄膜。评估了光吸收的一些重要特征，例如光学色散能量，介电常数，载流子数与有效质量的比率，单个振荡器波长以及振荡器强度的平均值。发现折射率的值取决于化学组成以及IrO 2的化学计量度。在基材温度和溶液摩尔浓度的相关范围内，通过两种方法获得的高频介电常数值分别在2.8-3.9和3.3-4.6的范围内。对吸收系数的能量色散曲线的分析表明，当衬底温度从350摄氏度增加到500摄氏度时，带隙能量在2.61和2.51 eV之间发生直接光学跃迁。

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