Surface characterization of Al thin film dependent on the substrate using fractal geometry

Document Type : Original Article


1 Department of physics, Maybod branch, Islamic Azad University, Maybod, Iran

2 Department of Physics, Yadegar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran

3 Department of Biology, Central Tehran Branch, Islamic Azad University, Tehran, Iran

4 Department of Physics , Central Tehran Branch, Islamic Azad University, Tehran, Iran


In this paper, Al films were deposited on glass and steel substrates by using thermal evaporation technique. X-ray diffraction (XRD) analysis was used for structural characterization of Al thin films. It was found that the growth process mechanism of Al film on two substrates was different. The difference in the growth mechanism and microstructures affects the surface properties. Atomic force microscope (AFM) and field emission scanning electron microscope (FESEM) have been used to describe the surface morphology and fractal properties of Al films. The fractal properties obtained by autocorrelation function (ACF), height-height correlation function (H(r)) and Minkowski function are described and compared with each other. The results of 2D AFM images show that the Al film on the steel substrate has higher surface roughness, roughness exponent, and lateral correlation length compared to the glass substrate. However, the Al film on the glass substrate has a higher spatial complexity with a fractal dimension of Df = 2.88.


Main Subjects

© 2023 The Author(s). Journal of Progress in Physics of Applied Materials published by Semnan University Press. This is an open access article under the CC-BY 4.0 license. (

[1] Mwema, F.M., Oladijo, O.P., Akinlabi, S.A. and Akinlabi, E.T., 2018. Properties of physically deposited thin aluminium film coatings: A review. Journal of alloys and compounds, 747, pp.306-323.
[2] Khlayboonme, S.T. and Thowladda, W., 2021. Impact of Al-doping on structural, electrical, and optical properties of sol-gel dip coated ZnO: Al thin films. Materials Research Express, 8(7), p.076402.
[3] Lambert, A.S., Valiulis, S.N., Malinick, A.S., Tanabe, I. and Cheng, Q., 2020. Plasmonic biosensing with aluminum thin films under the Kretschmann configuration. Analytical chemistry, 92(13), pp.8654-8659.
[4] Moumen, A., Kumarage, G.C. and Comini, E., 2022. P-type metal oxide semiconductor thin films: synthesis and chemical sensor applications. Sensors, 22(4), p.1359.
[5] Manthrammel, M.A., Shkir, M., Anis, M., Shaikh, S.S., Ali, H.E. and AlFaify, S., 2020. Facile spray pyrolysis fabrication of Al: CdS thin films and their key linear and third order nonlinear optical analysis for optoelectronic applications. Optical Materials, 100, p.109696.
[6] Wójcicka, A., Fogarassy, Z., Rácz, A., Kravchuk, T., Sobczak, G. and Borysiewicz, M.A., 2022. Multifactorial investigations of the deposition process–Material property relationships of ZnO: Al thin films deposited by magnetron sputtering in pulsed DC, DC and RF modes using different targets for low resistance highly transparent films on unheated substrates. Vacuum, 203, p.111299.
[7] Kim, K.B., Lee, J. and Kim, M., 2021. Characteristics by deposition and heat treatment of Cr and Al thin film on stainless steel. Journal of Convergence for Information Technology, 11(3), pp.167-173.
[8] Hwidi, M.H., Abduljabbar, L.M. and Emad, A., 2019. Laser effect on optical and structural properties of cdte: al thin films prepared by pulsed laser deposition technique. J Eng Appl Sci, 14(7), pp.2302-2308.
[9] Raoufi, D. and Faegh, H., 2012. Surface morphology dynamics in ITO thin films. Journal of Modern Physics, 2012.
[10] Rodríguez-Cañas, E., Aznárez, J.A., Oliva, A.I. and Sacedón, J.L., 2006. Relationship between the surface morphology and the height distribution curve in thermal evaporated Au thin films. Surface science, 600(16), pp.3110-3120.
[11] Fakharpour, M., 2021. The effect of slope and number of arms on the structural properties of square tower-like manganese thin films. Journal of Nanoanalysis, 8(1), pp.7-16.
[12] Karimzadeh, I., Aghazadeh, M., Dalvand, A., Doroudi, T., Kolivand, P.H., Ganjali, M.R. and Norouzi, P., 2019. Effective electrosynthesis and in situ surface coating of Fe3O4 nanoparticles with polyvinyl alcohol for biomedical applications. Materials Research Innovations, 23(1), pp.1-8.
[13] Aghazadeh, M., Karimzadeh, I. and Ganjali, M.R., 2019. PVA and EDTA grafted superparamagnetic Ni doped iron oxide nanoparticles prepared by constant current
electrodeposition for biomedical applications. Journal of Nanoanalysis, 6(2), pp.138-144.
[14] Pinto, E.P., Matos, R.S., Pires, M.A., Lima, L.D.S., Ţălu, Ş., da Fonseca Filho, H.D., Ramazanov, S., Solaymani, S. and Larosa, C., 2023. Nanoscale 3D spatial analysis of zirconia disc surfaces subjected to different laser treatments. Fractal and Fractional, 7(2), p.160.
[15] Nasehnejad, M., Nabiyouni, G. and Shahraki, M.G., 2017. Morphological characterisation and microstructure of silver films prepared by electrodeposition method. Surface Engineering, 33(5), pp.389-394.
[16] Khachatryan, H., Lee, S.N., Kim, K.B., Kim, H.K. and Kim, M., 2018. Al thin film: The effect of substrate type on Al film formation and morphology. Journal of Physics and Chemistry of Solids, 122, pp.109-117.
[17] Fakharpour, M. and Taheri, G., 2020. Fabrication of Al zigzag thin films and evaluation of mechanical and hydrophobic properties. Applied Physics A, 126(8), p.631.
[18] Arashti, M.G. and Fakharpour, M., 2020. Fabrication and characterization of Al/glass zig-zag thin film, comparing to the discrete dipole approximation results. The European Physical Journal B, 93, pp.1-6.
[19] Fakharpour, M., Gholizadeh Arashti, M. and Musazade Meybodi, M.T., 2021. Electrical characterization of zig-zag Aluminum thin films using experimental and theoretical methods. Journal of Optoelectronical Nanostructures, 6(3), pp.25-42.
[20] Fakharpour, M., 2023. Fractal and structural analysis of the different sculptured Mn-based nanostructures. Physics Letters A, 487, p.129136.
[21] Nogami, K., Kishimoto, K., Hashimoto, Y., Watanabe, H., Hishii, Y., Ma, Q., Niki, T., Kotani, T., Kiwa, T., Shoji, S. and Ohkubo, T., 2022. Self-growth of silver tree-like fractal structures with different geometries. Applied Physics A, 128(10), p.860.
[22] Rawat, S.S., Harsha, A.P. and Khatri, O.P., 2021. Synergistic effect of binary systems of nanostructured MoS2/SiO2 and GO/SiO2 as additives to coconut oil‐derived grease: Enhancement of physicochemical and lubrication properties. Lubrication Science, 33(5), pp.290-307.
[23] Raoufi, D., 2010. Fractal analyses of ITO thin films: A study based on power spectral density. Physica B: Condensed Matter, 405(1), pp.451-455.
[24] Yadav, R.P., Kumar, M., Mittal, A.K., Dwivedi, S. and Pandey, A.C., 2014. On the scaling law analysis of nanodimensional LiF thin film surfaces. Materials Letters, 126, pp.123-125.
[25] Li, J.M., Lu, L., Su, Y. and Lai, M.O., 2000. Self-affine nature of thin film surface. Applied surface science, 161(1-2), pp.187-193.
[26] Richardson, C.E., Park, Y.B. and Atwater, H.A., 2006. Surface evolution during crystalline silicon film growth by low-temperature hot-wire chemical vapor deposition on silicon substrates. Physical Review B, 73(24), p.245328.
[27] Yadav, R.P., Kumar, T., Mittal, A.K., Dwivedi, S. and Kanjilal, D., 2015. Fractal characterization of the silicon surfaces produced by ion beam irradiation of varying fluences. Applied Surface Science, 347, pp.706-712.
[28] Das, A., Chawla, V., Matos, R.S., da Fonseca Filho, H.D., Yadav, R.P., Ţălu, Ş. and Kumar, S., 2021. Surface microtexture and wettability analysis of quasi two-dimensional (Ti, Al) N thin films using fractal geometry. Surface and Coatings Technology, 421, p.127420.
[29] Nečas, D. and Klapetek, P., 2012. Gwyddion: an open-source software for SPM data analysis. Open Physics, 10(1), pp.181-188.