EPR Spectroscopy of Different Sol Concentration Synthesized Nanocrystalline-ZnO Thin Films

M. Arora, R. Zargar, S. D. Khan
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引用次数: 18

Abstract

Nanocrystalline zinc oxide (nc-ZnO) thin films were grown on p-type silicon substrate through spin coating by sol-gel process using different sol concentrations (10 wt.%, 15 wt.%, and 25 wt.%). These films were characterized by high resolution nondestructive X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDS) attachment, and electron paramagnetic resonance (EPR) techniques to understand variations in structural, morphological, and oxygen vacancy with respect to sol concentration. The film surface morphology changes from nanowall to nanorods on increasing sol concentration. EPR spectra revealed the systematic variation from ferromagnetic to paramagnetic nature in these nc-ZnO films. The broad EPR resonance signal arising from the strong dipolar-dipolar interactions among impurity defects present in nc-ZnO film deposited from 10 wt.% sol has been observed and a single strong narrow resonance signal pertaining to oxygen vacancies is obtained in 25 wt.% sol derived nc-ZnO film. The concentrations of impurity defects and oxygen vacancies are evaluated from EPR spectra, necessary for efficient optoelectronic devices development.
不同溶胶浓度合成纳米晶zno薄膜的EPR光谱研究
采用溶胶-凝胶法在p型硅衬底上制备了纳米氧化锌(nc-ZnO)薄膜。%, 15磅。%和25wt %)。通过高分辨率无损x射线衍射(XRD)、带能量色散x射线分析(EDS)的扫描电子显微镜(SEM)和电子顺磁共振(EPR)技术对这些膜进行了表征,以了解结构、形态和氧空位随溶胶浓度的变化。随着溶胶浓度的增加,膜表面形貌由纳米壁变为纳米棒状。EPR谱揭示了这些纳米氧化锌薄膜从铁磁性到顺磁性的系统变化。纳米氧化锌薄膜中杂质缺陷之间的强偶极-偶极相互作用产生了宽EPR共振信号。在25 wt中观察到% sol,得到了与氧空位有关的单一强窄共振信号。% sol衍生的nc-ZnO薄膜。从EPR光谱中评估杂质缺陷和氧空位的浓度,这是开发高效光电器件所必需的。
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