Synthesis and Application of Two Organic Dyes Based on Indoline in DyeSensitized Solar Cells

In this paper we sensitized two new organic dyes (Dye 1 and Dye 2) based on indoline with indoxyl as the electron donor group. We used acrylic acid and cyanoacrylic acid as the electron acceptor anchoring group in Dye 1 and Dye 2, respectively. The proposed dyes were sensitized from carbazole as the starting material by standard reactions and characterized by different techniques such as melting point, FTIR, 1HNMR, elemental analysis and UV-Visible spectroscopy after purification. Spectrophotometric measurements of the synthesized dyes in solution and on a TiO2 substrate were carried out in order to assess the changes in the status of the dyes. The wavelength of maximum absorption for Dye1 and Dye 2 in solution are 551.5 nm and 558 nm and on TiO2 films are 576 nm and 585 nm, respectively. Finally, the proposed dyes were used as sensitizer in a dye solar cell structure and their photovoltaic properties were also investigated. The Conversion efficiency for Dye 1 and Dye 2 were 1.03% and 1.45%, respectively.