Abstract
Inspired from the structure of Ru-complex dye C101, the 2-hexylthiophene moieties were introduced to the triphenylamine unit of dye L1 for dye L101as an attempt to enhance the donor capacity and achieve high overall power conversion efficiency (η). Finally, these two sensitizers were applied to Dye-sensitized solar cells(DSSCs), and their photovoltaic performance were further investigated through spectral, electrochemical, photovoltaic measurements. The η of L101 is 5.1% (Voc=724mV, Jsc=9.24mAcm−2, FF=0.76, εmaxabs=44.4×103M−1cm−1) which is higher than L1 (η=4.7%, Voc=712mV, Jsc=8.79mAcm−2, FF=0.75, εmaxabs=23.3×103M−1cm−1). This slight enhancement is mainly attributed to two reasons: firstly, the light-harvesting capacity is enhanced when introducing hexylthiophene moieties to the triphenylamine donor unit of L1 and contributed to a larger Jsc. Secondly, the introduced 2-hexylthiophene moieties improve the conduction band edge of TiO2 which result in the higher Voc of L101 than L1. These results demonstrate that the introduced 2-hexylthiophene moieties could help to achieve better performance.
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