Abstract
Cadmium telluride thin films were prepared by the close spaced sublimation (CSS) technique, using CdTe powder as evaporant and were submitted to a chemical treatment at 25°C in a saturated CdCl2 solution (2.08 g/100 mL methanol), followed by heat treatment under vacuum ~10−3 mbar at 400°C for 30 min. The effect of chemical and thermal treatments on the crystallographic, morphological, optical, and electrical properties were studied through XRD, scanning electron microscope (SEM), spectrophotometry, and dc electrical resistivity measurements, respectively. The studies revealed that the CdTe grows in face centered cubic phase and that post-deposition treatment affects the morphology as well as the crystallographic properties. The effect on the morphology is stronger. Increase of the grain size was observed in the samples treated thermally. The electrical resistivity drops by a factor of 20 in CdCl2-immersed and heated samples.
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References
Werthen, JG, Anthony, TC, Fahrenbruch, AL, Bube, RH, 16th IEEE Photovoltaic Specialists Conference, p. 1138, 1982
Tyan, YS, Perez-Albuerne, EA, 16th IEEE Photovoltaic Specialists Conference, p. 794, 1982
Chakrabarti, R, Dutta, J, Maity, AB, Chaudhuri, S, Pal, AK, “Photoconductivity of CdTe films.” Thin Solid Films, 32 288 (1996)
Touskova, J, Kindl, D, Tousek, “Preparation and characterization of CdS/CdTe thin film solar cells.” Thin Solid Films, 293 272 (1997) doi:10.1016/S0040-6090(96)09113-4
Matsumoto, H, Kuribayashi, K, Komatsu, Y, Nakano, A, Uda, H, Ikegami, S, “30 × 30 cm2 CdS/CdTe Single Substrate Module Prepared by Screen Printing Method.” Jpn. J. Appl. Phys, 22 891 (1983) doi:10.1143/JJAP.22.891
Wu, X, Keane, JC, Dhere, RG, Dehart, C, Albin, DS, Duda, A, Gessert, TA, Asher, SD, Levi, H, Sheldon, P, “Seventeenth European Photovoltaic Solar Energy Conference.” Proc. from the International Conference, Vol. 1, p. 995. WIP-Munich and ETA-Florence, 2001
Abbas Shah, N, Ali, A, Ali, Z, Maqsood, A and Aqili, AKS, “Properties of Te-rich cadmium telluride thin films fabricated by closed space sublimation technique.” J. Cryst. Growth, 284 477 (2005) doi:10.1016/j.jcrysgro.2005.08.005
Nakayama, N, Matsumoto, H, Nakano, A, Ikegami, S, Uda, H, Yamashita, T, “Ceramic Thin Film CdTe Solar Cell.” J. Appl. Phys. 19 703 (1980) doi:10.1143/JJAP.19.703
Khan, MA, Shah, NA, Ali, A, Basharat, M, Hannan, MA, Maqsood, A, “Fabrication and Characterization of Cd-Enriched CdTe Thin Films by Close Spaced Sublimation.” J. Coat. Technol. Res. (2008) (online)
Menezes, CA, “Low Resistivity CdTe-Te Films by a Combined Hot-Wall-Flash Evaporation Technique.” Electrochem J. Soc. Sol. Stat. Sci. Tech. 127 155 (1980)
Huber, W, Lopez-Otero, A, “The Electrical Properties of CdTe Films Grown by Hot Wall Epitaxy.” Thin Solid Films 58 21 (1979) doi:10.1016/0040-6090(79)90201-3
Humenburger, J, Sitter, H, Huber, W, Sharma, NC, Lopez-Otero, A, “Hot-wall epitaxy of II-VI compounds: cadmium sulfide and cadmium telluride.” Thin Solid Films 90 101 (1982) doi:10.1016/0040-6090(82)90081-5
Chakrabarti, R, Dutta, J, Maity, AB, Chaudhuri, S, Pal, AK, “Photoconductivity of CdTe films.” Thin Solid Films 288 32 (1996) doi:10.1016/S0040-6090(96)08801-3
Cohen, ML, Chelikowsky, JR, “Electronic Structure and Optical Properties of Semiconductor.” In: Cardona, M, Fulde P, von Klitzing, K, Queisser, HJ (eds.) Series in Solid State Science, 2nd edn., Vol. 75, p. 80. Springer (1988)
Kim, KH, Chun, JS, “X-ray Studies of SnO2 Prepared by Chemical Vapour Deposition.” Thin Solid Films, 141 (2) 287–295 (1986)
Moutinho, HR, Al-Jasim, MM, Abufoltuh, FA, Levi, DH, Dippo, PC, Dhere, RG, Kazmerski, LL, IEEE 26th Photovoltaic Specialists Conference, 1997
Infante, H, Gordillo, G, “Effect of the CdCl2 treatment on the morphology and structural properties of CdTe thin films deposited by the CSS method.” Surf. Rev. Lett. 9 1681 (2002) doi:10.1142/S0218625X02004219
Abbas Shah, N, Ali, A, Maqsood, A, “Preparation and characterization of CdTe for solar cells, detectors and related thin film materials.” Journal of Electronic Materials, 37 (2) 145–151 (2008) doi:10.1007/s11664-007-0338-7
Swanepoel, R, “Determination of the thickness and optical constants of amorphous silicon.” J. Phys. E. Sci. Inst. 16 1214–22 (1983) doi:10.1088/0022-3735/16/12/023
Nazar Abbas Shah, Abid Ali, Aqili AKS, Asghari Maqsood, “Physical Properties of Ag doped cadmium telluride thin films fabricated by closed space sublimation technique.” J. Cryst. Growth, 290 452–458 (2006) doi:10.1016/j.jcrysgro.2006.01.051
Acknowledgments
This work was supported by Pakistan Science Foundation and Higher Education Commission through the project No. 20-694. Special thanks to Drs. A. S. Bhatti, Adil Syed, Ashraf Atta, and M. Aslam of CIIT, Islamabad, and Dr. Z. Ali for his valuable discussion during the presentation of this work.
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Shah, N.A., Ali, A., Hussain, S. et al. CdCl2-treated CdTe thin films deposited by the close spaced sublimation technique. J Coat Technol Res 7, 105–110 (2010). https://doi.org/10.1007/s11998-008-9146-0
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DOI: https://doi.org/10.1007/s11998-008-9146-0