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Fabrication and Characterization of Electron Transport and Buffer Layer Thin Films, Employing Sputtering Method, for All-Oxide Solar Cells

Farahani, Elham | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49659 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Iraji zad, Azam; Mohammadpour, Raheleh
  7. Abstract:
  8. In this study, transparent conductive thin film of Aluminum doped ZnO (ZnO:Al) have been fabricated thorough RF sputtering. The main goal of fabrication of these layers is achieving thin films with minimum resistivity and maximum optical transparency in visible range of spectrum employing as transparent electrodes and buffer layer at the entirely oxidized solar cells. To achieve the suitable structure, various parameters including pressure, power and the thickness of the deposition and annealing on morphologies of thin film has been investigated. According to these results, thin film of ZnO:Al has the transparency of 80% in the visible light range . Doping of ZnO with Aluminum caused increase in the band gap of layer from 3.25 eV in doped sample which is 0.10 eV more than the pure samples. Also the resistivity reached the value of 11.38 Ω-cm by optimizing the power of deposition (110W), duration of deposition (3hours) and gas pressure (4*10-2torr). It should be noted that annealing at 400°C under a hydrogen atmosphere reduced the resistance of surface. In addition, the pattern of X-ray diffraction indicates the formation of the crystalline phase of zinc oxide. The layer made of Zinc oxide doped with the aluminum and the zinc oxide respectively was applied in transparent electrode and buffer layer of the solar cell. The best performance with highest current density of (14.58 mA/cm2) and efficiency of (0.43%) from solar cell of substrate structure is related to the transparent electrode with the deposition of 5 hours through optimized power and pressure. Also the best performance with efficiency of 0.17% from superstrate structure is related to the transparent electrode with the deposition duration of 2 hours and buffer layer with the deposition duration of 1 hour
  9. Keywords:
  10. Zinc Oxide ; Sputtering ; Transparent Conducting Oxide Glass ; Aluminum Doped Zinc Oxide ; Oxidized Solar Cell

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