Panchromatic Sensitizer for Dye-Sensitized Solar Cells: Unsymmetrical Squaraine Dyes Incorporating Benzodithiophene π-Spacer with Alkyl Chains to Extend Conjugation, Control the Dye Assembly on TiO<sub>2</sub>, and Retard Charge Recombination
作者:Rajesh Bisht、Munavvar Fairoos M. K.、Ambarish Kumar Singh、Jayaraj Nithyanandhan
DOI:10.1021/acs.joc.6b02670
日期:2017.2.17
(NIR) active unsymmetrical squaraine dyes, RSQ1 and RSQ2, with benzodithiophene (BDT) π-spacer and cyanoacrylic acid acceptor were synthesized by utilizing palladium catalyzed direct (hetero)arylation reaction. Methyl and 2-ethylhexyl groups were strategically placed at the BDT unit for RSQ1 and RSQ2, respectively, to investigate the effect of alkylated π-spacer on dye aggregation on the TiO2 surface and
利用钯催化的直接(杂)芳基化反应,合成了具有苯并二噻吩(BDT)π间隔物和氰基丙烯酸受体的无金属近红外(NIR)活性不对称方酸方形染料RSQ1和RSQ2。分别在BDT单元的RSQ1和RSQ2上分别策略性地放置了甲基和2-乙基己基,以研究烷基化的π-间隔基对TiO 2表面染料聚集和TiO 2 /染料/电解质界面的重组反应的影响。这些染料具有强吸收性(ε> 10 5 M –1 cm –1)在近红外(NIR)区域具有相同的共轭骨架,因此显示出相似的光学和电化学性质。RSQ2比进行更好RSQ1由于其较高的开路电压(V OC)和填充因子(FF,尽管具有可比较的短路电流密度(的)Ĵ SC)。还观察到两种染料的全色入射光子-电流转换效率(IPCE)响应。RSQ2的功率转换效率(PCE)为6.72%,短路电流密度(J sc)为18.53 mA / cm 2,开路电压(V oc))的0.538 V )和67