Photovoltaic Materials, Department of Material Chemistry, Korea University 2511 Sejong-Ro, Sejong 339-700, South Korea.
ChemSusChem. 2013 Aug;6(8):1425-31. doi: 10.1002/cssc.201300281. Epub 2013 Jun 20.
An efficient organic sensitizer (JK-306) featuring a planar indeno[1,2-b]thiophene as the π-linker of a bridging unit for dye-sensitized solar cells (DSSCs) was synthesized. The sensitizer had a strong molar absorption coefficient and a red-shifted absorption band compared with JK-305, which resulted in a significant increase in the short-circuit photocurrent density. We incorporated a highly congested bulky amino group into the 2',4'-dihexyloxybiphenyl-4-yl moiety, an electron donor, to diminish the charge recombination and to prevent aggregation of the sensitizer. Under standard AM 1.5G solar conditions, JK-306-sensitized cells in the presence of co-adsorbents chenodeoxycholic acid (CDCA) and 4-[bis(9,9-dimethyl-9H-fluoren-2-yl)amino]benzoic acid (HC-A), which afforded an overall conversion efficiency of 8.37% and 8.52%, respectively. Upon changing the I(-) /I3 (-) electrolyte to the Co(II) /Co(III) redox couple, the cell gave rise to a significantly improved conversion efficiency of 10.02% with the multifunctional HC-A, which is one of the highest values reported for DSSCs with a cobalt-based electrolyte. Furthermore, the JK-306-based solar cell with a polymer gel electrolyte revealed a high conversion efficiency of 7.61%, which is one of the highest values for cells based on organic sensitizers.
一种高效的有机敏化剂（JK-306），其特征在于将平面茚并[1,2-b]噻吩作为桥接单元的π-linker 用于染料敏化太阳能电池（DSSC）。与 JK-305 相比，该敏化剂具有更强的摩尔吸收系数和红移吸收带，这导致短路光电流密度显著增加。我们在 2'，4'-二己氧基联苯-4-基部分，即电子供体中引入了高度拥挤的庞大氨基，以减少电荷复合并防止敏化剂聚集。在标准 AM 1.5G 太阳条件下，在共吸附剂胆酸（CDCA）和 4-[双（9,9-二甲基-9H-芴-2-基）氨基]苯甲酸（HC-A）的存在下，JK-306 敏化电池的总转换效率分别为 8.37%和 8.52%。当将 I(-)/I3(-)电解质改为 Co(II)/Co(III)氧化还原对时，电池的转换效率显著提高至 10.02%，多功能 HC-A 的转换效率为 10.02%，这是基于钴电解质的 DSSC 的最高值之一。此外，基于 JK-306 的聚合物凝胶电解质太阳能电池的转换效率达到了 7.61%，这是基于有机敏化剂的电池中最高的转换效率之一。
