Study on the improved structure of dye-sensitized solar cells for enhancing light absorption

Abstract

The absorption coefficients of N719 or N3 dyes at the longer wavelength region (>600 nm) are not enough to catch photons efficiently, but the solar spectrum has a large photon flux in the wavelength region between 500 and 1,000 nm, so it is desirable to enhance the absorption of light by the dye-sensitized solar cells (DSSC) to achieve higher efficiencies. To solve this problem, an improved structure of DSSC for enhancing light absorption is introduced in this paper, and I-V characteristics of DSSC are measured to illustrate the enhancement of the light absorption and efficiency. As a result, the improved DSSC exhibits higher light absorption and solar-to-electric conversion efficiency than traditional DSSC.

Keywords

dye-sensitization, TiO₂, solar cells, nanocrystalline, spectra