Novel near-infrared sensitizers with different anchoring groups aiming toward improved stability and efficiency of dye-sensitized solar cells were synthesized. Adsorption of these dyes on the mesoporous TiO₂ surface revealed the dye adsorption rate of −CH=CH-COOH (SQ-139) > −CH=C(CN)COOH (SQ-140) > −PO3H2 (SQ-143) > −CH=C(CN)PO₃H₂ (SQ-148) > −CH=C(CN) PO₃H-C₂H₅ (SQ-157) > −PO₃H-C₂H₅ (SQ-151) > −CH=CH-COOH(−PO₃H₂) (SQ-162). The binding strength of these dyes on mesoporous TiO₂ as investigated by dye desorption studies follows SQ-162 > SQ-143 > SQ-148 > SQ-139 ≫ SQ-157∼SQ-151 ≫ SQ-140 order. The acrylic acid anchoring group was demonstrated to be an optimum functional group owing to its fast dye adsorption rate and better binding strength on TiO₂ along with good photoconversion efficiency. Results of dye binding on TiO₂ surface demonstrated that SQ-162 bearing double anchoring groups of phosphonic and acrylic acid exhibited > 550 times stronger binding as compared to dye SQ-140 having cyanoacrylic acid anchoring group. SQ-140 exhibited the best photovoltaic performance with photon harvesting mainly in the far-red to near-infrared wavelength region having short circuit current density, open-circuit voltage and fill factor of 14.28 mA·cm⁻², 0.64 V and 0.65, respectively, giving the power conversion efficiency of 5.95%. Thus, dye SQ-162 not only solved the problem of very poor efficiency of dye bearing only phosphonic acid while maintaining the extremely high binding strength opening the path for the design and development of novel near-infrared dyes with improved efficiency and stability by further increasing the π-conjugation.

合成了具有不同锚定基团的新型近红外敏化剂，旨在提高染料敏化太阳能电池的稳定性和效率。这些染料在介孔 TiO ₂表面的吸附表明染料吸附速率为 -CH=CH-COOH (SQ-139) > -CH=C(CN)COOH (SQ-140) > -PO3H2 (SQ-143) > -CH=C(CN)PO ₃ H ₂ (SQ-148) > -CH=C(CN) PO ₃ H-C ₂ H ₅ (SQ-157) > -PO ₃ H-C ₂ H ₅ (SQ-151) > - CH=CH-COOH(-PO ₃ H ₂ ) (SQ-162)。这些染料对介孔 TiO ₂的结合强度通过染料解吸研究，按照 SQ-162 > SQ-143 > SQ-148 > SQ-139 ≫ SQ-157∼SQ-151 ≫ SQ-140 顺序。丙烯酸锚定基团被证明是最佳的官能团，因为它具有快速的染料吸附速率和在 TiO ₂上更好的结合强度以及良好的光转换效率。TiO ₂表面上染料结合的结果表明，与具有氰基丙烯酸锚定基团的染料SQ-140相比，带有膦酸和丙烯酸双锚定基团的SQ-162表现出> 550倍强的结合。SQ-140表现出最好的光伏性能，光子收集主要在远红到近红外波长区域，短路电流密度、开路电压和填充因子为14.28 mA·cm ^-2，分别为 0.64 V 和 0.65，功率转换效率为 5.95%。因此，染料 SQ-162 不仅解决了仅含膦酸的染料效率极低的问题，同时保持了极高的结合强度，为设计和开发具有更高效率和稳定性的新型近红外染料开辟了道路。该π -conjugation。