The Synthesis of Two New Dye based on Thioindigo and Investigation of their Properties in Dye-Sensitized Solar Cells

In this paper we synthesized two new organic days (dye 1 and dye 2) based on thioindigo with phenothiazine 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 synthesized from phenothiazine 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 changes in the status of the dyes. The wavelength of maximum absorption for dye1 and dye 2 in solution are 499 nm and 505 nm and on TiO2 films are 523 nm and 527 nm، respectively. Finally، the proposed dyes used as sensitizer in a dye solar cell structure and their photovoltaic properties investigated. The Conversion efficiency for dye 1 and dye 2 are 2. 34% and 3. 07%، respectively.