AUTHOR: OKOLI, LAETICIA UDODIRI
DEPARTMENT: PHYSICS AND INDUSTRIAL PHYSICS
AFFILIATION: NNAMDI AZIKIWE UNIVERSITY, AWKA
Dye-sensitized solar cell has been successfully fabricated on transparent Fluorine-doped Tin Oxide (FTO) coated glass substrates with sheet resistance of 14.42 Ω/□ using Blade method. The cell was fabricated using an equal mixture of activated carbon and graphite as the counter electrode, a nanocrystaline Titanium (IV) Oxide (TiO2) as the photoelectrode, iodine electrolyte and a natural dye – anthocyanin dye extracted from roselle plant (zobo plant). An undyed cell was also fabricated using the same materials and deposition method. The thickness of the counter electrode and photoelectrode films were 4.2μm and 6.2μm respectively. The electric energy conversion efficiency of the dyed cell was found to be 0.6% in good agreement with the measurements of 0.193 to 11%. That of the undyed cell was 0.003%. The small efficiency of the undyed cell could be attributed to the fact that the wide band gap semiconductor TiO2 can only absorb fractions of light compared with the dyed cell. Hence the efficiency of the dyed cell is 200times the efficiency of the undyed cell.
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Tags: Activated Carbon, Blade Techniques., Dye Theory, Efficiency, Fill Factor, Graphite, Light Absorbing Materials, Open Circuit Voltage, Physics and Industrial Physics Thesis-2010, Screen Printing, Sheet Resistance, Short Circuit Current, Sol Gel Process, Sol Gel Technique, Solar Cell Assembly, Solar Cell Theory, Solar Radiation, Spin Coating, Titanium IV Oxide, Transparent Conducting Oxides, Transparent Conductors, Zobo Plant