State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Centre on Molecular Devices, Dalian University of Technology, Dalian, PR China.
ChemSusChem. 2013 Jul;6(7):1270-5. doi: 10.1002/cssc.201200949. Epub 2013 Jun 14.
Organic dyes have become widely used in dye-sensitized solar cells (DSSCs) because of their good performance, flexible structural modifications, and low costs. To increase the photostability of organic dye-based DSSCs, we conducted a full study on the degradation mechanism of cyanoacrylic acid-based organic sensitizers in DSSCs. The results showed that with the synergy between water and UV light, the sensitizer could desorb from the TiO2 surface and the cyanoacrylic acid unit of the sensitizer was transformed into the aldehyde group. It was also observed that the water content had a great effect on the degradation process. Our experiments conducted using (18) O-labeled water demonstrated that the oxygen atom of the aldehyde group identified in the degraded dye came from the solvent water in the DSSCs. Therefore, controlling the water content during DSSC fabrication, good sealing of cells, and filtering the UV light are crucial to produce DSSCs that are more durable and robust.
有机染料由于其良好的性能、灵活的结构修饰和低成本，已在染料敏化太阳能电池（DSSC）中得到广泛应用。为了提高基于有机染料的 DSSC 的光稳定性，我们对 DSSC 中基于氰基丙烯酸的有机敏化剂的降解机制进行了全面研究。结果表明，在水和紫外光的协同作用下，敏化剂可以从 TiO2 表面解吸，敏化剂的氰基丙烯酸单元转化为醛基。还观察到，水含量对降解过程有很大影响。我们使用（18）O 标记水进行的实验表明，在降解染料中鉴定出的醛基的氧原子来自 DSSC 中的溶剂水。因此，在 DSSC 制造过程中控制水含量、对电池进行良好密封以及过滤紫外光对于制造更耐用和稳健的 DSSC 至关重要。
