Preparation of Fluoride-Doped Tin Oxide Films on Soda鈥揕ime Glass Substrates by Atomized Spray Pyrolysis Technique and Their Subsequent Use in Dye-Sensitized Solar Cells

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• 作者：G. R. Asoka Kumara ; C. S. Kumara Ranasinghe ; E. Nirmada Jayaweera ; H. M. Navaratne Bandara ; Masayuki Okuya ; R. M. Gamini Rajapakse
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 31, 2014
• 年：2014
• 卷：118
• 期：30
• 页码：16479-16485
• 全文大小：465K
• ISSN：1932-7455

文摘

The development of a novel method for the fabrication of low-cost, transparent, conducting glass (F^{鈥?/sup>-doped SnO₂ layer on soda鈥搇ime glass, FTO) by a specially developed atomized spray pyrolysis technique using cheap soda鈥搇ime glass in place of commercially used expensive glass at a comparatively lower temperature of 450 掳C is presented. The use of these FTO plates in dye-sensitized solar cells (DSCs) will also be described. The optimum temperature of 450 掳C for the FTO layer on soda鈥搇ime glass is obtained by carrying out atomized spray pyrolysis of the precursor solution onto the soda鈥搇ime glass substrate at several different temperatures and by characterizing the materials obtained at each temperature by X-ray diffraction analysis. The FTO layers formed at 450 掳C have also been characterized by scanning electron microscopy (SEM) for morphology, grain size, and film thickness and by UV鈥搗isible transmittance spectroscopy for the optical transmission in the visible range. The electrical properties of the FTO film prepared at 450 掳C are estimated by the van der Pour method and Hall measurements. The FTO films have a uniform texture with smaller grains (鈮?0 nm) embedded in cages formed by larger particles (鈮?50 nm). The presence of large grains is important for transparent conducting glass applications. The average film thickness, estimated from the SEM images, is 560 nm. The material possesses superior electrical properties such as electronic conductivity, electron mobility, and carrier density of 1.71 脳 103 S鈥塩m鈥?, 10.89 cm2 V鈥?鈥塻鈥?, and 9.797 脳 1020 cm鈥?, respectively, at room temperature. This low-cost technique, which uses cheap soda鈥搇ime glass for the fabrication of FTO, is better suited for commercialization. The DSCs fabricated using these FTO plates, with the cell configuration of FTO on soda鈥搇ime glass/interconnected TiO₂ nanocrystalline layer/N719 dye/I鈥?/sup>, I₃鈥?/sup> electrolyte/mirror-type chromium-coated and lightly platinized FTO electrode, give a maximum light-to-electricity efficiency of 10.4% under AM 1.5 (100 mW cm鈥?) illumination for a cell active area of 0.25 cm2.}