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首页> 外文期刊>Applied Surface Science >Swift heavy ion induced modifications in cobalt doped ZnO thin films: Structural and optical studies
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Swift heavy ion induced modifications in cobalt doped ZnO thin films: Structural and optical studies

机译：快速重离子诱导的钴掺杂ZnO薄膜中的修饰：结构和光学研究

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摘要

Modifications in the structural and optical properties of 100 MeV Ni~(7+) ions irradiated cobalt doped ZnO thin films (2n_(1-x)Co_xO, x = 0.05) prepared by sol-gel route were studied. The films irradiated with a fluence of 1 × 10~(13) ions/cm~2 were single phase and show improved crystalline structure with preferred C-axis orientation as revealed from XRD analysis. Effects of irradiation on bond structure of thin films were studied by FTIR spectroscopy. The spectrum shows no change in bonding structure of Zn-O after irradiation. Improved quality of films is further supported by FTIR studies. Optical properties of the pristine and irradiated samples have been determined by using UV-vis spectroscopic technique. Optical absorption spectra show an appreciable red shift in the band gap of irradiated Zn_(1-x)Co_xO thin film due to sp-d interaction between Co~(2+) ions and ZnO band electrons. Transmission spectra show absorption band edges at 1.8 eV, 2.05 eV and 2.18 eV corresponding to d-d transition of Co~(2+) ions in tetrahedral field of ZnO. The AFM study shows a slight increase in grain size and surface roughness of the thin films after irradiation.
机译：研究了用溶胶凝胶法制备的100 MeV Ni〜（7+）离子辐照钴掺杂ZnO薄膜（2n_（1-x）Co_xO，x = 0.05）的结构和光学性质的变化。从XRD分析可知，以1×10〜（13）离子/ cm〜2的通量辐照的薄膜是单相的，并显示出具有更好的C轴取向的改进的晶体结构。通过FTIR光谱研究了辐照对薄膜键合结构的影响。光谱显示在辐照后Zn-O的键合结构没有变化。 FTIR研究进一步支持提高胶片质量。原始和辐照样品的光学性质已通过使用紫外可见光谱技术确定。光学吸收光谱显示，由于Co〜（2+）离子与ZnO带电子之间的sp-d相互作用，Zn_（1-x）Co_xO薄膜的带隙中出现了明显的红移。透射光谱显示在1.8 eV，2.05 eV和2.18 eV处的吸收带边缘，对应于ZnO四面体场中Co〜（2+）离子的d-d跃迁。原子力显微镜研究表明，辐照后薄膜的晶粒尺寸和表面粗糙度略有增加。

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