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A spectroscopic study for determining linear optical and predicting nonlinear optical properties of sprayed ZnO:W thin films: an effect of morphology
Optical Review ( IF 1.2 ) Pub Date : 2022-01-04 , DOI: 10.1007/s10043-021-00718-9
K. Bahedi 1, 2 , A. Mrigal 2 , A. Talbi 2 , H. Cherrad 2 , N. Fellahi 2 , S. Bayoud 2 , M. Addou 3 , H. Ftouhi 3
Affiliation  

This paper reports the linear and nonlinear optical spectroscopic study of tungsten-doped zinc oxide thin films (ZnO:W) with various dopant concentration grown by spray pyrolysis technique on pre-heated glass substrates at 450 °C. The ZnO:W thin films are polycrystalline with the hexagonal wurtzite structure and have a preferred orientation with the c-axis perpendicular to the substrates. SEM investigation shows that thin films’ morphology is influenced by dopant concentration. The Appearance of pores on grains surface is observed in thin films doped with 2 at.% of tungsten. In linear optical properties analysis, all films possess high optical transmission in visible domain. The direct optical band gap value was calculated and found to be 3.21, 3.06, 3.17 and 3.14 (eV) for undoped and tungsten-doped thin films, respectively. Refractive index values were calculated and discussed. Third-order nonlinear optical properties were studied using a spectroscopic method. Predicted third order susceptibility values were interpreted. The results reveal that doping by tungsten improved the nonlinear optical susceptibility and that this last is strongly influenced by the structural geometry and it could be enhanced by pores of grains. The obtained results suggest that the prepared thin films recommend their application in laser technology.



中文翻译:

确定线性光学和预测喷涂 ZnO:W 薄膜的非线性光学特性的光谱研究:形态的影响

本文报道了通过喷雾热解技术在 450 °C 预热的玻璃基板上生长的具有不同掺杂浓度的钨掺杂氧化锌薄膜 (ZnO:W) 的线性和非线性光谱研究。ZnO:W 薄膜是具有六方纤锌矿结构的多晶薄膜,并且具有优选取向,c 轴垂直于基板。SEM 研究表明薄膜的形态受掺杂剂浓度的影响。在掺杂有 2 at.% 钨的薄膜中观察到晶粒表面孔隙的出现。在线性光学特性分析中,所有薄膜在可见光域都具有高光透射率。计算直接光学带隙值,发现对于未掺杂和钨掺杂的薄膜,直接光学带隙值分别为 3.21、3.06、3.17 和 3.14 (eV)。计算并讨论了折射率值。使用光谱方法研究了三阶非线性光学特性。解释了预测的三阶磁化率值。结果表明,钨的掺杂改善了非线性光学磁化率,这最后受结构几何形状的强烈影响,并且可以通过晶粒孔隙增强。获得的结果表明制备的薄膜推荐它们在激光技术中的应用。结果表明,钨的掺杂改善了非线性光学磁化率,这最后受结构几何形状的强烈影响,并且可以通过晶粒孔隙增强。获得的结果表明制备的薄膜推荐它们在激光技术中的应用。结果表明,钨的掺杂改善了非线性光学磁化率,这最后一点受结构几何形状的强烈影响,并且可以通过晶粒孔隙增强。获得的结果表明制备的薄膜推荐它们在激光技术中的应用。

更新日期:2022-01-05
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