Co-sensitization of dyes on hybrid TiO2- MWCNTs photoanode is an effective approach to enhance the performance of a dye-sensitized solar cell (DSSC). In this work, N719 sensitizer is co-sensitized with N3. The co-sensitized device showed enhanced VOC and JSC in comparison to single-dye sensitized devices. Upon optimization, the device made of the 0.1Mm N3 + 0.4 mM N719 yielded JSC = 12.5 mA cm-2, Voc = 0.73 V, FF = 0.45 and η = 4.1 %.This performance is superior to that of either of the individual DSSCs sensitized with N3 (3.69%) and N719 (3.51 %) under the same conditions of fabrication. The efficiency of DSSCs was further improved to 4.46% by the incorporation of MWCNTs in TiO2. The hybrid TiO2/MWCNTs photoanodes with different concentrations of CNTs (0.04. 0.08, 0.12, 0.16 wt. %) were prepared using mixing technique. The optimized molar ratio of N3/N719 was used for the sensitization of hybrid photonodes. Density functional theory (DFT) was used to compute the band gaps of TiO2 and CNT-TiO2 clusters.
Bibliographical noteFunding Information:
The authors would like to acknowledge the support provided by King Abdulaziz City for Science and Technology (KACST) through the Science & Technology Unit at King Fahd University of Petroleum & Minerals (KFUPM) for funding this work through project # 11-ENE1635-04 as part of the National Science, Technology and Innovation Plan. KFUPM is also acknowledged for supporting this research. The authors would like to acknowledge the Center of Research Excellence for Renewable Energy at KFUPM.
© 2015 Published by Elsevier Ltd.
- density functional theory
- multi-walled carbon nanotubes
ASJC Scopus subject areas
- Chemical Engineering (all)