Thickness effect on scaling law and surface properties of nano-dimensional SnTe thin films

材料科学 缩放比例 光学 薄膜 表面粗糙度 表面光洁度 分形 分形维数 红外线的 扫描电子显微镜 指数 凝聚态物理 纳米技术 复合材料 物理 几何学 数学分析 语言学 哲学 数学
作者
G. Maity,Ram Pratap Yadav,Rahul Singhal,Indra Sulania,Ashok Mittal,Dhirendra K. Chaudhary,D. Kanjilal,Shiv P. Patel
出处
期刊:Journal of Applied Physics [American Institute of Physics]
卷期号:130 (17) 被引量:8
标识
DOI:10.1063/5.0066006
摘要

SnTe is an important material because of its applications in mid-infrared photo-detectors. In the present work, the effects of film thickness on scaling law and surface properties (i.e., morphologies and optical properties) of SnTe thin films have been investigated. SnTe thin films of different thicknesses are prepared by means of e-beam evaporation technique. The surface morphology of each film is analyzed by atomic force microscopy (AFM) as well as a scanning electron microscope. The crystallinity of the films is found to increase with increasing film thickness, as confirmed by x-ray diffraction and Raman measurements. Fractal analysis is performed on AFM images to investigate the irregularity of surfaces. It is found that the surface of the thicker sample is rougher than the thinner sample. The autocorrelation function is applied to investigate the self-affine fractal nature of surfaces. The average roughness, interface width, lateral correlation length, local surface slope, and fractal dimension increased with film thickness. The values of roughness exponent, growth exponent, dynamic exponent, and steepening exponent are calculated and found to be α=0.76-0.96, β=0.75, z=1.92, and λ=0.35-0.25, respectively. The scaling exponents together with the other parameters such as the local surface slope indicate that the growth is quasi-3D island/mound type with rapid surface roughening behavior and obeys anomalous scaling. The multiple scattering cross sections of light together with Fourier transform infrared spectroscopy data analyses suggest that the higher crystalline film with a smaller number of defects is infrared-sensitive and may be more suitable for advanced mid-infrared detector applications.

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