【资料】自制染料敏化太阳能电池(图解)

２．A thin layer of TiO2 is coated on the photo electrode. This layer consists of a spongy 3 dimensional nano crystalline network. The layer itself has a thickness of 10 micrometer and is randomly stacked. Nano technology lies at the heart of this type of solar cell. The TiO2 particles are ‘grown’ from around 3 nm to approx. 20 nm which appears to be the most optimal size for this type of dye solar cell.

3.The dye molecules attach to the TiO2 particles.

4. The plus or counter electrode is provided with a thin graphite layer. The purpose of the graphite is to act as a catalyst.

5. The electrolyte is added. The electrolyte consists of Iodine (I2) and Sodium Iodide (NaI) dissolved in ethanol.

6.The electrical circuit is completed. The solar cell kit contains both a calculator and melody module to actually show that power is being generated and used. A multimeter is included to measure resistance, voltage and current generated. The actual working of the dye solar cell is contained in a further series of slides.

7.Dye molecules chemically attach to the TiO2 particles when the negative electrode is submerged in the liquid dye.

The transformation of photon energy into electrical current occurs in sequence as shown in the following slides:

8.A small amount of light is absorbed by the dye molecules.

9.The photon energy present is transferred to single electrons in the dye molecules.

10.Upon transfer of photon energy, the single electrons become mobile and able to leave their defined bonds.