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Zhang Z.,Hefei University of Technology | Shi C.,Hefei University of Technology | Shi C.,Fujian Electric Power Company | Sun S.,Fujian Electric Power Company | And 2 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2010

Transparent conductive thin films of F:SnO2 (FTO) were deposited on preheated microscopic glass slides using SnCl4·5H2O and NH4F as sources for tin and fluorine, isopropanol and water as solvents by an intermittent spray pyrolysis method. The effects of concentration of SnCl4, NH4F, H2O2 and volume ratio of isopropanol to water on the optical and electrical characteristics of FTO thin films were investigated. The FTO thin films were characterized by X-ray diffractometer, scanning electron microscope, ultraviolet-visible spectrometry and four-point-probe setup. The results show that the transmittance of the FTO thin films can be improved due to a moderate concentration of H2O2 (~0.05 mol/L) in the spraying solution, and the sheet resistance is unchanged. The sheet resistance and the average transmittance of the FTO thin films prepared with the solution with 0.8 mol/L SnCl4, 0.1 mol/L NH4F and 0.05 mol/L of H2O2, at a volume ratio of isopropanol to water of 8:2 for 100 times at 500°C are 15 Ω/□ and 84%, respectively. The FTO thin film has uniform grain size and a compact morphology. Source


Zhang Z.-H.,Hefei University of Technology | Shi C.-W.,Hefei University of Technology | Shi C.-W.,Fujian Electric Power Company | Sun S.-Q.,Fujian Electric Power Company | And 2 more authors.
Gongneng Cailiao yu Qijian Xuebao/Journal of Functional Materials and Devices | Year: 2010

Transparent conducting thin films of F: SnO 2 have been deposited onto preheated microscopic glass slides by intermittent spray pyrolysisde position using pentahydrate stannic chloride (SnCl 4 · 5H 2O) and ammonium fluoride (NH4F) as precursors. A perfume atomizer for cosmetics use has been used for deposition. As-deposited films were characterized by XRD, SEM, UV-VIS spectrophotometer and four-point-probe setup. The influence of spray times, substrate temperature, precursor concentration, doping concentration and ethanol to water ratio on the optical and electrical properties of films abovementioned were discussed. The results show that the sheet resistance of the thin films is 13Ω/□ and the average transmittance is 79%, when the concentration of SnCl 4 · 5H 2O is 0.81 mol/L, the concentration of NH 4F is 0.1 mol/L, the ethanol to water ratio is 8: 2, being sprayed 100 times at 500°C. Source


Zhang Z.,Hefei University of Technology | Wu Y.,Hefei University of Technology | Ge Q.,Hefei University of Technology | Sun S.,Fujian Electric Power Company | And 3 more authors.
Solar Energy | Year: 2010

In this paper, we reported the preparation of 1-methyl-3-propylimidazolium acetate (MPIAc), which proceeded via the metathesis of 1-methyl-3-propylimidazolium iodide (MPII) and lead acetate or potassium acetate. The apparent diffusion coefficients of triiodide and iodide in binary ionic liquids, MPIAc and MPII with various weight ratios, were demonstrated by cyclic voltammetry using a Pt ultramicroelectrode. It was found that the apparent diffusion coefficients of triiodide increased and those of iodide slightly increased with the weight ratio increase of MPIAc and MPII. The dye sensitized solar cells with the electrolyte, which was composed of 0.13 M I2, 0.10 M LiI, 0.50 M 4-tert-butylpyrdine in the binary ionic liquid electrolyte of MPIAc (employing potassium acetate) and MPII (weight ratio 0.2), gave short circuit photocurrent density of 9.40 mA cm-2, open circuit voltage of 0.62 V, and fill factor of 0.57, corresponding to the photoelectric conversion efficiency of 3.34% at the illumination (air mass 1.5, 100 mW cm-2). © 2010. Source


Wang Y.,Hefei University of Technology | Wu Y.,Hefei University of Technology | Qin Y.,Hefei University of Technology | Zhang Z.,Hefei University of Technology | And 10 more authors.
Materials Research Bulletin | Year: 2011

In this paper, we reported the successful preparation of fluorine-doped tin oxide (FTO) thin films on large-area glass substrates (1245 mm × 635 mm × 3 mm) by self-designed offline atmospheric pressure chemical vapor deposition (APCVD) process. The FTO thin films were achieved through a combinatorial chemistry approach using tin tetrachloride, water and oxygen as precursors and Freon (F-152, C2H4F2) as dopant. The deposited films were characterized for crystallinity, morphology (roughness) and sheet resistance to aid optimization of materials suitable for solar cells. We got the FTO thin films with sheet resistance 8-11 Ω/□ and direct transmittance more than 83%. X-ray diffraction (XRD) characterization suggested that the as-prepared FTO films were composed of multicrystal, with the average crystal size 200-300 nm and good crystallinity. Further more, the field emission scanning electron microscope (FESEM) images showed that the films were produced with good surface morphology (haze). Selected samples were used for manufacturing tandem amorphous silicon (a-Si:H) thin film solar cells and modules by plasma enhanced chemical vapor deposition (PECVD). Compared with commercially available FTO thin films coated by online chemical vapor deposition, our FTO coatings show excellent performance resulting in a high quantum efficiency yield for a-Si:H solar cells and ideal open voltage and short circuit current for a-Si:H solar modules. © 2011 Elsevier Ltd. All rights reserved. Source

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