Aggregation‐Free Organic Dyes Featuring Spirodibenzo34:67cyclohepta12‐bquinoxaline‐109′‐fluorene (SDBQX) for Dye‐Sensitized Solar Cells

摘要

Three novel organic dyes coded as >FHD4‐1, >FHD4‐2, and >FHD4‐3 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 of >FHD4‐1, >FHD4‐2, and >FHD4‐3 in solutions and adsorbed on TiO2 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.