PROPERTIES OF FLUORINE DOPED SnO2 TRANSPARENT CONDUCTOR DEPOSITED BY ELECTROSTATIC ASSISTED CHEMICAL VAPOUR DEPOSITION (EACVD) METHOD
Abstract
The experimental work deals with the properties of Fluorine doped Tin Oxide (SnO2) thin film. It is aimed at ascertaining the optimized conductivity of the electrical and optical properties of the films as the temperature increase at constant volume. Five(5) samples of Tin oxide were grown at various temperatures at constant volume of 2.5ml to ascertain the effect of temperature on the conductivity of the doped thin film. The Electrostatic spray-assisted chemical vapour deposition (EACVD) method was adopted for the Flourine doped thin oxide (FTO) preparation. The results show that the values of the band gap ranges from 2.23 eV to 2.42 eV. The profilometer readings shows that the thickness of the film changes as the temperature increases from 0.008µm, 0.012 µm, 0.006 µm, 0.5 µm, 0.001 µm for 0.4m, at 330 oC, 450oC, 470oC 490oC and 510oC respectively. The highest percentage of absorbance values across the different samples lies in between 300nm – 400nm at temperature 330oC and the lowest absorbance was 954nm at 510oC. This study therefore concludes that the exposure to high temperatures during annealing process improves on their electrical properties and optical properties of the films, by reduction of the sheet resistance from 1477.5 cm to 4.62 cm, 9.87 cm, 22.711 cm and 3.25 cm as the temperature increases. This makes doped SnO 2 thin films stable and a good choice for making a transparent thin film efficient of different application.
Downloads
References
Smith M Hampden, (1995) "Aerosol processing of materials". (New York: Wiley-Vch) 421.
Cheng S.H., Ning Z.Y., Ge S.B, Chao Y., Gang Z.Q., Zhang Y.X., Liu Z.G. (2006), Preparation and characterization of ZnO:Al films by pulsed laser deposition. Thin Solid Films.
Eyitayo and Ekpekpo Trans. Of NAMP Singh M., Mehta B.R. (2006), Effect of structural anisotropy on electronic conduction in delafossite tin doped copper indium oxide thin films. Applied Physics Letters; 9: 233-256
Ali S., Tayebeh S., and Jaber F., (2011)."ITO-free organic solar cells using highly conductive phenol-treated PEDOT:PSS anodes". Organic Electronics. 24: 188–194.
Vallejos, S., Di Maggio, F., Shujah, T. & Blackman, C. (2017), Chemical vapour deposition of gas sensitive metal oxides. Chemosensors 4, 4.
Martijn F. J. Vos, Harm C. M. Knoops, Wilhelmus M. M. Kessels, Adriaan J. M. Mackus. (2021), Reaction Mechanisms during Atomic Layer Deposition of AlF3 Using Al(CH3)3 and SF6 Plasma. The Journal of Physical Chemistry, 125 (7)
Kim, K.S., Yoon, S.Y., Lee W.J and Kim, K.H. (2012) "Surface morphologies and electrical properti s of antimony-doped tin oxide films deposited by plasma enhanced chemical vapor deposition". Surface and Coatings technology. 138 (2-3), 229-236.
Lewis F., (2011) “Effect of SnCL4 concentration on F: SnO2, deposited by chemical spray pyrolysis”. In the proceedings of international Renewable Energy Congress, Souse, Tunisia, 2, 276-279.
Jain, V.K.; Kumar, P.; Vijay, Y.K. (2012) "Preparation of nanostructure ZnO-SnO2 thin films for optoelectronic properties and post annealing influence". World Acad. Sci. Eng. Technol., 72, 1575–1577.
Ekpekpo A., Iyayi S.E., Aiyehuyin E.O (2010). Phase Transitions for Unconventional Superconductivity. International Journal of Research and Reviews in Applied Sciences, 5(3), 305-309.
Rupp, Joel; Guffy, Eri; Jacobsen, Gary. (2012) "Electrostatic spray processes". TW Ransburg Electrostatic Systems, in Metal Finishing 2012 Organic Finishing Guidebook.Elsevier.126-127.
Mehta S.K., Kumar S., Chaudhary S., Bhasin K.K. (2009). Nucleation and growth of surfactant passivatedCdS and HgS NPs: Time dependent Absorption and Luminescence profiles. The Royal Society of Chemistry.
Igwe H.U and Ugwu E.I. (2010) "Optical Characteristics of NanocrystalineThermal Annealed Tin Oxide (SnO2) Thin Film samples Prepared by Chemical Bath Deposition Technique". Journal of Advance in Applied Science Research, 1(3), 240-246.
Odari, B.M., Mageto, M.J., Musembi, R.J., Othieno, H., Gaitho, F., and Muramba, V. (2013) "Optical and Electrical Properties of Pd Doped SnO 2 Thin Films Deposited by Spray Pyrolysis". Australian Journal of Basic and Applied Sciences, 7 (2): 89-98.
Menarian, F., Guillen – Gervauntes , A., Nieto-Zapeda, K.E., Quinones- Galvan, JG., Hernandez- Hernandez. A., Olvera, M.G and Melendez- Lira, M. (2010) "SnO 2 Thin Films Deposited by RF Magnetron Sputtering: Effect of the SnF2 Amount in the Target on the Physical Properties". Revista Mexicana de Fisica, 59, 335-338.
Ravichandran, E.A., Makdisi, Y and Ramazaniyan, A.H. (2009) "Electronic and optical properties of fluorine - doped tin oxide films". Journal of Applied Physics, 83, 1049-1057.
