Effects of an Intercalation Nanocomposite at the Photoanode/Electrolyte Interface in Quasi-Solid Dye-Sensitized Solar Cells

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• 作者：Rui Gao ; Liduo Wang ; Yi Geng ; Beibei Ma ; Yifeng Zhu ; Haopeng Dong ; Yong Qiu
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：September 15, 2011
• 年：2011
• 卷：115
• 期：36
• 页码：17986-17992
• 全文大小：912K
• 年卷期：v.115,no.36(September 15, 2011)
• ISSN：1932-7455

文摘

In this paper, interface effects of N-methyl-benzimidazole (NMBI) and a novel intercalation composite of NMBI and montmorillonite (MMT) were studied. The intercalation composite showed better interface modification effects than NMBI individually. The FTIR spectra results showed interaction between N3 and NMBI could retard the aggregation of dye molecules, decreasing the electron quenching and charge recombination. However, the results of cyclic voltammograms and UV鈥搗is absorption edge revealed the interaction between NMBI and dye molecules could cause the lowest unoccupied molecular orbital (LUMO) level of the dye molecule to drop, decreasing the electron injection efficiency. It decreased the J_sc of dye-sensitized solar cells (DSCs). The intercalation composite could remedy the disadvantage of NMBI and obtain strengthened interface effects. The photocurrent鈥搗oltage (I鈥?i>V) curve showed that, with the modification of this intercalation nanocomposite, the J_sc of the devices increased, showing that the disadvantage caused by NMBI was improved. Besides, results of the dark current curve and transient photovoltage spectra showed the NMBI鈥揗MT intercalation composite modification retarded charge recombination more effectively than using NMBI individually. An electrochemical impedance spectroscopy (EIS) test also indicated that modification of the NMBI鈥揗MT intercalation composite showed a strengthened effect of retarding the charge recombination. Furthermore, the results of intensity-modulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS) tests also showed that the interface modification of the NMBI鈥揗MT intercalation composite enhanced the electron transportation and lifetime in DSCs more than using NMBI individually.