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Exp 5 - Lab Report Example

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Silicon is most common material for their manufacture. However, dye-sensitized cells which are cheaper but with lower efficiency could be promising alternatives. The structure of the dye-sensitized cell is as…
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Exp 5
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Download file to see previous pages The tape served as a spacer. One side of taped area was uncoated and an alligator clip could be connected later be connected. The surface of the tape and exposed glass was wiped using a tissue soaked in ethanol and the ethanol allowed to evaporate. A small amount of titanium dioxide paste was added and quickly spread by pushing with a microscope slide across the taped surface before the paste dries. The tape gave a spacing of 40-50 micrometers and thus controlled the thickness of the titanium dioxide layer. The tape was carefully removing without scratching the TiO2 coating. The glass was then heated on a hotplate in a hood for 10-20 minutes until the surface turned brown as the organic solvent and surfactant dried and burned off to produce a white or green sintered titanium dioxide coating. The glass was allowed to cool slowly. The coating was immersed in raspberry juice for ten minutes until a color change was observed. Remaining solution and solid was gently rinsed off with water followed by ethanol. A carbon coating was made on the conducting side of the second piece of tin oxide glass by passing it through the candle. The carbon which is located on the perimeter of three sides of the glass plate wiped off using a dry cotton swab. The two coated sides of both glasses were placed facing each other and held in place using two clips. Triiodide solution was added at the edge of the plate and allowed to spread through the interface. The current and voltage were then measured.
When the dye-sensitized cell was placed in the sun the voltage measured was 3.73 and 3.72 volts which give a power of 930watts and 1193 watts respectively. When placed under the projector the measured voltages were 3.48 and 0.14V corresponding to a power of 97.44 watts and 18.2 watts respectively. From the experiment, it is observed that the highest power output was measured when the solar cell was placed outside in the sun.
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