Co-sensitization of TiO2-MWCNTs hybrid anode for efficient dye-sensitized solar cells. (10th August 2015)

• Record Type: Journal Article
• Authors: Mehmood, Umer; Ahmed, Shakeel; Hussein, Ibnelwaleed A.; Harrabi, Khalil
• Is Part Of: Electrochimica acta. Volume 173(2015)
• Page Start: 607
• Page End: 612
• Publication Date: 2015-08-10
• Subjects: Hybrid -- multi-walled carbon nanotubes -- co-sensitization -- density functional theory; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.05.132
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Abstract: 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 J SC 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.