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The applications of electrochemically functionalized porphyrin have been considered in dye-sensitized solar cells (DSSCs). A porphyrin-catechol derivative has been electrochemically functionalized with a sulfur-contained, 2-mercaptobenzothiazole moiety and was tested as dye. Catechol moiety acts as the anchoring group in these types of dyes. The IPCE result confirmed that photocurrents for DSSCs based on porphyrin-catechol dyes are mainly generated by an indirect electron injection pathway (Type I mechanism). The cells made with this porphyrin were stable and showed no significant desorption of dye from the TiO2 surface after days. Electrochemically functionalized porphyrin-catechol showed almost 100 % enhancement in efficiency compared to bare porphyrin-catechol. The effect of different additives on cell performance was also tested. Electrochemically functionalized porphyrin catechol, in the presence of chenodeoxycholic acid had a record performance with a conversion efficiency of 0.6 % under AM 1.5 irradiation.
Link: https://link.springer.com/article/10.1007/s13738-016-0850-x