ABSTRACT
In this chapter, the authors discuss the successful construction of cells with a high power efficiency. Photocurrents in dye-sensitized photocells composed of aqueous electrolyte solutions and various semiconductor electrodes have also been studied. The presence of I2 in the solution prevents the accumulation of over-potential of the platinum electrode at the working condition. Most of the work on dye-sensitized photocells by previous workers as well as in the early stage of their work was done with the electrodes dipped into aqueous electrolyte–dye solutions. The authors found that the porosity and the dye-adsorbing capability of the zinc oxide (ZnO) sinter depend largely on the ZnO powder used and the method of sintering. The disk is then dyed by keeping it in a concentrated aqueous rose bengal solution. For instance, if the dye forms a monomolecular layer, the absorptivity by the dye is ~10–2, and therefore most of the light passes through the dye layer without causing any useful effect.
