Kimyasal banyo depolama yöntemi ile elde edilen cds filmlerinin yapısal, optiksel ve morfolojik özellikleri üzerine tavlama işleminin etkisi

Kadmiyum sülfür filmleri kimyasal banyo depolama yöntemi ile cam tabanlar üzerine biriktirildi. Elde edilen filmler azot gazında 1 saat boyunca 200-400 oC sıcaklık aralığında tavlandı. Filmlerin kristal yapısı x-ışını kırınım (XRD) desenlerinden belirlendi. XRD verileri, tavlama etkisiyle CdS (FCC) yapısından α-CdS (Hawleyite) formuna geçiş olduğunu gösterdi. Elde edilen CdS filmlerinin optiksel bant aralığı değerleri optiksel absorbans spetrumlarından yararlanılarak 2,33 ve 2,39 eV olarak belirlendi. Bant sarkmaları değerleri 120-350 meV arasında olduğu hesaplandı. Filmlerin görünür bölgede %45-92 arasında geçirgenlik değerlerine sahip olduğu belirlendi.

Anahtar Kelimeler:

CdS, Kimyasal banyo depolama, Tavlama, Optik özellikler

Influence of the annealing treatment on structural, optical and morphological properties of CdS films obtained by chemical bath deposition

Cadmium sulphide films have been deposited onto glass substrate by chemical bath deposition method. The CdS films have been annealed in the temperature range of 200-400 oC at one hour in nitrogen gas. The crystal structures of the films were determined by x-ray diffraction (XRD) patterns. XRD data showed that the transition from CdS (FCC) to α-CdS (Hawleyite) form by annealing effect. The optical band gaps of the films have been obtained from the optical absorbance spectrum found to be 2.33 and 2.39 eV. The bands bending in the films were calculated to be between 120-350 meV. The optical transmissions of the films have been determined to be between 45-92 % in the visible region.

Keywords:

CdS, Chemical bath deposition, Thermal annealing, Optical properties,

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[1] Zhou, L., Hu, X., Wu, S., “Effects of deposition temperature on the performance of CdS films with chemical bath deposition”, Surf. Coat. Tech., 228, S171-S174, (2013).
[2] Kwon, J.-H., Ahn, J.-S., Yang, H., “Chemical bath deposition of CdS channel layer for fabrication of low temperature-processed thin-film-transistors”, Curr. Appl. Phys., 13, 84-89, (2013).
[3] Zyoud, A., Saa’deddin, I., Khudruj, S., Hawash, Z.M., Park, D., Campet, G., Hilal, H.S., “CdS/FTO thin film electrodes deposited by chemical bath deposition and by electrochemical deposition: A comparative assessment of photo-electrochemical characteristics”, Solıd State Scı., 18, 83-90, (2013).
[4] Pan, Z., Li, Yan, Hou, X., Yan, J., Wang, C., “Effect of annealing temperature on the photocatalytic activity of CdS-modified TNAs/glass nanotube arrays”, Physica E, 63, 1–7, (2014).
[5] Islam, M.A., Hossain, M.S., Aliyu, M.M., Chelvanathan, P., Huda, Q., Karim, M.R., Sopian, K., Amin, N., “Comparison of Structural and Optical Properties of CdS Thin Films Grown by CSVT, CBD and Sputtering Techniques”, Energy Procedia, 33, 203–213, (2013).
[6] Aybek, A.S., Kul, M., Turan, E., Zor, M., Gedik, E., “Thermally Stimulated Currents in CdS Film Produced by Ultrasonic Spray Pyrolysis Method”, J. Phys.: Condens. Matter., 20, 055216-055221, (2008).
[7] Anuar, K., Zulkarnain, Z., Saravanan, N., Nazri, M., Sharin, R., “Effects of Electrodeposition Periods and Solution Temperatures Towards the Properties of CdS Thin Films Prepared in the Presence of Sodium Tartrate”, Mater. Sci., 11, 101-104, (2005).
[8] Lee, J., “Comparison of CdS films deposited by different techniques: Effects on CdTe solar cell”, Appl. Surf. Sci., 252, 1398-1403, (2005).
[9] Pérez-Hernández, G., Pantoja-Enríquez, J., Escobar-Morales, B., Martinez-Hernández, D., Díaz-Flores, L.L., Ricardez-Jiménez, C., Mathews, N.R., Mathew, X., “A comparative study of CdS thin films deposited by different techniques”, Thin Solid Films, 535, 154-157, (2013).
[10] Sasikala, G., Dhanasekaran, R., Subramanian, C., “Electrodeposition and optical characterisation of CdS thin films on ITO-coated glass”, Thin Solid Films, 302, 71-76, (1997).
[11] Petillon, S., Dinger, A., Grün, M., Hetterich, M., Kazukauskas, V., Klingshirn, C., Liang, J., Weise, B., Wagner, V., Geurts, J., “Molecular beam epitaxy of CdS/ZnSe heterostructures”, J. Cryst. Growth, 201/202, 453-456, (1999).
[12] Liu, F., Lai, Y., Liu, J., Wang, B., Kuang, S., Zhang, Z., Li, J., Liu, Y., “Characterization of chemical bath deposited CdS thin films at different deposition temperature”, J. Alloy Compd., 493, 305-308, (2010).
[13] Metin, H., Esen, R., “Annealing studies on CBD grown CdS thin films”, J. Cryst. Growth, 258, 141–148, (2003).
[14] Zhan, H., Li, J.kang, Cheng, Y.fei, “Preparation and properties of CdS thin films deposited by chemical bath deposition”, Optik, 126, 1411-1414, (2015).
[15] Jiang, T., Wang, Y., Meng, D., Wu, X., Wang, J., Chen, J., “Controllable fabrication of CuO nanostructure by hydrothermal method and its properties”, Appl. Surf. Sci., 311, 602–608, (2014).
[16] Cullity, B.D., Stock, S.R., “Elements of X-ray Diffraction”, Prentice-Hall, Upper Saddle River, NJ (2001).
[17] Metin, H., Erat, S., Durmuş, S., Ari, M., “Annealing effect on CdS/SnO2 films grown by chemical bath deposition”, Appl. Surf. Sci., 256, 5076-5081, (2010).
[18] Aybek, A. S., Rüzgar, H., “Effect of the pH on Crystal Structural, Optical and Surface Morphological Properties of the CdS Films Deposited by Chemical Bath Deposition”, Chalcogenide Lett., 13, 339 – 350, (2016).
[19] Kim, D., Park, Y., Kim, M., Choi, Y., Park, Y.S., Lee, J., “Optical and structural properties of sputtered CdS films for thin film solar cell applications”, Mater. Res. Bull., 69, 78-83, (2015).
[20] Mimouni, R., Boubaker, K., Amlouk, M., “Investigation of structural and optical properties in Cobalt–Chromium co-doped ZnO thin films within the Lattice Compatibility Theory scope”, J. Alloy. Compd., 624, 189–194, (2015).
[21] Bayansal, F., Şahin, B., Yüksel, M., Biyikli, N., Çetinkara, H.A., Güder, H.S., “Influence of coumarin as an additive on CuO nanostructures prepared by successive ionic layer adsorption and reaction (SILAR) method”, J. Alloy. Compd., 566, 78–82. (2013).
[22] Pankove, J.I., “Optical Processes in Semiconductors”, Prentice-Hall, Engle wood Cliffs, NJ (1971).
[23] Chiad, S.S., Jabbar, W.A., Habubi, N.F., “Effects of Annealing on the Electronic Transitions of ZnS Thin Films”, J. Ark. Acad. Sci., 65, 39-42, (2011).
[24] Urbach, F., “The Long-Wavelength Edge of Photographic Sensitivity and of the Electronic Absorption of Solids”, Phys. Rev., 92, 1324, (1953).
[25] Aşıkoğlu, A., Yükselici, M.H., “Evolution of the energy band structure in chemical-bath-deposited CdS thin ﬁlms studied by optical absorption spectroscopy”, Semicond. Sci. Technol. 26, 055012 (5pp), (2011).
[26] Revathi, N., Prathap, P., Subbaiah, Y.P.V., Ramakrishna Reddy, K.T., “Substrate temperature dependent physical properties of In2S3 films”, J. Phys. D: Appl. Phys., 41, 155404 (10pp), (2008).
[27] Dhanasekaran, V., Mahalingam T., “Physical properties evaluation of various substrates coated cupric oxide thin films by dip method”, J. Alloy. Compd, 539, 50–56, (2012).
[28] Mimouni, R., Boubaker, K., Amlouk, M., “Investigation of structural and optical properties in Cobalt–Chromium co-doped ZnO thin films within the Lattice Compatibility Theory scope”, J. Alloy. Compd., 624, 189–194, (2015).