Siliconized Triarylamines As Redox Mediator in Dye-Sensitized Solar Cells
journal contributionposted on 28.11.2012, 00:00 by Ali Sepehrifard, Brett A. Kamino, Timothy P. Bender, Sylvie Morin
A new class of triarylamine compound functionalized with bulky triisopropylsilyl ether (−OTIPS) groups is used as a hole transport material in dye-sensitized solar cells (DSSCs). Using both optical and photoelectrochemical techniques, we compared the performance of this compound with that of a parent compound containing methyl ethers as well as the conventional I3–/I– redox couple. DSSCs fabricated with the triisopropylsilyl ether-substituted triarylamine exhibited high open circuit potentials (Voc > 0.9 V on average) and efficiencies of up to 1.9%. However, cells fabricated with triarylamine containing methyl ethers performed very poorly, pointing to the importance of −OTIPS in the overall performance of this material.