Nano-Photochemistry and Solar chemistry Laboratories, Department of Chemistry, Faculty of Science, Ain Shams University, Abbassia, 11566 Cairo, Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Nov;115:202-7. doi: 10.1016/j.saa.2013.05.090. Epub 2013 Jun 2.
This paper deals with the use of some natural pigments as well as synthetic dyes to act as sensitizers in dye-sensitized solar cells (DSSCs). Anthocyanin dye extracted from rosella (Hibiscus sabdariffa L.) flowers, the commercially available textile dye Remazole Red RB-133 (RR) and merocyanin-like dye based on 7-methyl coumarin are tested. The photostability of the three dyes is investigated under UV-Vis light exposure. The results show a relatively high stability of the three dyes. Moreover, the photostability of the solid dyes is studied over the TiO2 film electrodes. A very low decolorization rates are recorded as; rate constants k=1.6, 2.1 and 1.9×10(-3)min(-1) for anthocyanin, RR and coumarin dyes, respectively. The stability results favor selecting anthocyanin as a promising sensitizer candidate in DSSCs based on natural products. Dyes-sensitized solar cells are fabricated and their conversion efficiency (η) is 0.27%, 0.14% and 0.001% for the anthocyanin, RR and coumarin dyes, respectively. Moreover, stability tests of the sealed cells based on anthocyanin and RR dyes are done under continuous light exposure of 100mWcm(-2), reveals highly stable DSSCs.
本文研究了一些天然色素和合成染料在染料敏化太阳能电池（DSSC）中作为敏化剂的应用。从洛神花（Hibiscus sabdariffa L.）中提取的花色苷染料、市售的纺织品染料 Remazole Red RB-133（RR）和基于 7-甲基香豆素的类甲川染料进行了测试。研究了三种染料在紫外可见光照下的光稳定性。结果表明，三种染料具有相对较高的稳定性。此外，还研究了三种固态染料在 TiO2 薄膜电极上的光稳定性。记录到的褪色率非常低，花色苷、RR 和香豆素染料的速率常数 k 分别为 1.6、2.1 和 1.9×10(-3)min(-1)。稳定性能的结果表明，花色苷是基于天然产物的 DSSC 中很有前途的敏化剂候选物。制备了染料敏化太阳能电池，并测试了它们的能量转换效率（η），花色苷、RR 和香豆素染料的能量转换效率分别为 0.27%、0.14%和 0.001%。此外，对基于花色苷和 RR 染料的密封电池进行了连续 100mWcm(-2)光照射下的稳定性测试，结果表明 DSSC 具有高度稳定性。
