Aggregation‐Free Organic Dyes Featuring Spiro[dibenzo[3,4:6,7]cyclohepta[1,2‐ b]quinoxaline‐10,9′‐fluorene] (SDBQX) for Dye‐Sensitized Solar Cells

摘要

Three novel organic dyes coded asFHD4‐1 ,FHD4‐2 , andFHD4‐3 featuring spiro[dibenzo[3,4:6,7]cyclohepta[1,2‐b ]quinoxaline‐10,9′‐fluorene] (SDBQX ) moieties are designed to inhibit dye aggregation to improve the performance of dye‐sensitized solar cells (DSSCs). The consistent absorption onsets ofFHD4‐1 ,FHD4‐2 , andFHD4‐3 in solutions and adsorbed on TiO_(2)films indicate that these dyes are aggregation‐free dyes. Therefore, coadsorption with chenodeoxycholic acid (CDCA) of these three dyes reduces the performance of DSSCs because no inhibition effect for dye aggregation is needed, but, on the contrary, the dye loading amount is reduced after addition of CDCA. Three novel organic dyes featuring spiro[dibenzo[3,4:6,7]cyclohepta[1,2‐b ]quinoxaline‐10,9′‐fluorene] (SDBQX) moieties are designed to inhibit dye aggregation. Their consistent absorption onsets in solutions and adsorbed on TiO_(2)films indicate that these dyes are aggregation‐free. Coadsorption with chenodeoxycholic acid (CDCA) reduces the performance because no inhibition effect for dye aggregation is needed but the dye loading amount is reduced after addition of CDCA.