EFFECT OF FLUORINE CONTENT ON THE MORPHOLOGICAL, STRUCTURAL, OPTICAL AND ELECTRICAL PROPERTIES OF NANOSTRUCTUREDSnO2FILMS

K. K. Purushothaman, M. Dhanasankar and G. Muralidharan ()
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K. K. Purushothaman: Department of Physics, Gandhigram Rural University, Gandhigram 624 302, India
M. Dhanasankar: Department of Physics, Kamaraj College of Engineering and Technology, Virudhunagar 626 001, India
G. Muralidharan: Department of Physics, Gandhigram Rural University, Gandhigram 624 302, India

Surface Review and Letters (SRL), 2007, vol. 14, issue 06, 1149-1156

Abstract: This paper reports morphological and structural details, optical and electrical properties of fluorine dopedSnO2thin films prepared via spray pyrolysis route usingSnCl2·2H2Oas precursor and methanol as a solvent. The effect of fluorine concentration on the properties of the films is presented and discussed. X-ray diffraction pattern reveals the presence ofSnO2films in the rutile structure with a preferential growth along the (200) direction. FTIR spectrum confirms the films to be made ofSnO2. EDS was used to estimate the fluorine concentration. SEM reveals the surface of FTO to be made of nanocrystalline particles. The grain size calculated using Debye–Scherrer formula is in the range of 8–34 nm. Film thickness measured using optical transmission method is in the range of 425–538 nm. The sheet resistance was found to decrease with increase in fluorine concentration, to a minimum of 6.35 Ω/□ for 7.5 mol% ofNH4F, and it showed an increase beyond this concentration. The 2.5 mol% ofFdoped films gave 95.20% transmission at 704 nm. The calculated reflectivity in the IR region is 93.57% for 7.5 mol% ofFdoping, and figure of merit for the same film is 0.025(Ω/□)-1at 550 nm. The total work was optimized by fixing the temperature at 550°C for the usage of Electrochromic Device preparations on FTO coated glass substrates.

Keywords: Spray pyrolysis; FTO; SnCl2precursor; thin films; 73.61.-r; 78.20.-e; 73.90.+f (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1142/S0218625X07010731

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