Synthesis and Characterization of Indoline-based organic sensitizers for photoelectrochemical cells

In this paper we designed and prepared three free-metal organic days Dye 1, Dye 2 and Dye 3 based on indoline with n-phenly substituents iminodibenzyl as the electron donor group. We used cyanoacrylic acid substituent as the electron acceptor anchoring group in organic dyes. The proposed dyes were prepared from iminodibenzyl as the starting material by standard reactions and characterized by different techniques such as melting point, FT-IR, 1HNMR, elemental analysis and UV-Visible spectroscopy after purification. Spectrophotometric measurements of the organic dyes in solution and on a photoanode substrate were carried out in order to assess changes in the status of the dyes. The wavelength of maximum absorption for Dye 1 to Dye 3 in solution are 416 nm, 421 nm and 409 nm and on photoanode substrate are 437 nm, 440 nm and 421 nm, respectively. Finally, the proposed dyes used as sensitizer in a photoelectrochemical cell structure and their photovoltaic properties investigated. The Conversion efficiency for Dye 1 to Dye 3 are 2.84 and 3.11 and 2.12, respectively.