School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510641, China.
Institute of Organic Chemistry, University of Mainz , Mainz 55099, Germany.
ACS Appl Mater Interfaces. 2015 Sep 16;7(36):20418-29. doi: 10.1021/acsami.5b06404. Epub 2015 Sep 1.
Five novel metal-free organic dyes DQ1-5 containing a dipentyldithieno[3,2-f:2',3'-h]quinoxaline (DPQ) unit were synthesized and applied in dye-sensitized solar cells (DSSCs), where DPQ was employed as a π-spacer for the first time. Their photophysical, electrochemical, and theoretical calculations and photovoltaic properties were systematically investigated. All the five dyes show broad photoresponse. Especially the absorption edges of DQ3-5 extend to 800 nm on the TiO2 films. The inserted electron-rich unit 3,4-ethylenedioxythiophene or electron-withdrawing group benzothiadiazole (BTD) in DPQ-based dyes can greatly influence the optoelectronic properties of the dyes. In addition, the different electron donors also significantly affect the performance of the DSSCs. Under standard global AM 1.5 solar light conditions, the DQ5 sensitized solar cell obtained a power conversion efficiency of 7.12%. The result indicates that the rigid DPQ-based organic dye is a promising candidate for efficient DSSCs.
五种新型的不含金属的有机染料 DQ1-5 被合成出来，它们都含有一个二戊基二噻吩并[3,2-f:2',3'-h]喹喔啉（DPQ）单元，DPQ 单元首次被用作π-间隔基。这些染料的光物理、电化学和理论计算以及光伏性能都被系统地研究了。所有这五种染料都表现出宽的光响应。尤其是 DQ3-5 的吸收边缘在 TiO2 薄膜上扩展到了 800nm。DPQ 基染料中插入的富电子单元 3,4-亚乙基二氧噻吩或吸电子基团苯并噻二唑（BTD）可以极大地影响染料的光电性能。此外，不同的电子供体也显著影响 DSSC 的性能。在标准的全球 AM 1.5 太阳光条件下，DQ5 敏化的太阳能电池获得了 7.12%的功率转换效率。结果表明，基于刚性 DPQ 的有机染料是高效 DSSC 的有前途的候选材料。
