Figure 3 Current density-voltage ( J -

V ) characteristic

Figure 3 Current density-voltage ( J -

V ) characteristics of DSSCs based on PEDOT/FTO, TiO 2 -PEDOT:PSS/PEDOT:PSS/glass, STA-9090 and Pt/FTO CEs. Table 2 The performances of dye-sensitized solar cells with different CEs measured under an AM 1.5G illumination Counter electrode V oc (V) J sc (mA cm−2) FF η (%) PEDOT:PSS/FTO 0.72 11.63 0.43 3.64 TiO2-PEDOT:PSS/PEDOT:PSS/glass 0.73 12.45 0.51 4.67 Pt/FTO 0.75 10.54 0.63 5.11 Conclusions In summary, we utilize a facile wet method to fabricate a novel hierarchical Pt- and FTO-free CE for the dye-sensitized solar cell. It is found that the TiO2 doped PEDOT:PSS catalytic activity layer will dramatically affect the electrochemical properties of the final device. By adjusting the composition of TiO2, the properties of CE have been optimized preliminarily. Because of the large active area of TiO2 nanoparticles, the proposed composite CE shows excellent enhancement in the conductivity and the superior catalytic activity for the reduction of I3 − to I−. The conversion efficiency is increased

by 22% than that of the DSSC with PEDOT:PSS/FTO CE and is comparable to that of the DSSC with traditional Pt/FTO CE. After further optimization, the TiO2-PEDOT:PSS/PEDOT:PSS/glass CE can be more cost-effective, high efficient, and flexible to replace Pt and FTO CEs and more broadly used for future commercial applications. Acknowledgements We acknowledge the support partly from the National Natural Science Foundation of China (grant nos. 91333122, 51372082, 51172069, 50972032, 61204064, PLX3397 buy Paclitaxel and 51202067), the Ph.D. Programs Foundation of Ministry of Education of China (grant nos. 20110036110006, 20120036120006, and 20130036110012), and the Fundamental Research Funds for the Central Universities. References 1. O’Regan B, Grätzel M: A low-cost, high-efficiency

solar cell based on dye-sensitized colloidal TiO 2 films. Nature 1991, 353:737–740.CrossRef 2. Grätzel M: Photoelectrochemical cells. Nature 2001, 414:338–344.CrossRef 3. Xu HG, Zhang XY, Zhang CJ, Liu ZH, Zhou XH, Pang SP, Chen X, Dong SM, Zhang ZY, Zhang LX, Han PX, Wang XG, Cui GL: Nanostructured titanium nitride/PEDOT:PSS composite films as counter electrodes of dye-sensitized solar cells. ACS Appl Mater Interfaces 2012, 4:1087–1092.CrossRef 4. Song DD, Li MC, Bai F, Li YF, Jiang YJ, Jiang B: Silicon nanoparticles/PEDOT-PSS nanocomposite as an efficient counter electrode for dye-sensitized solar cells. Funct Mater Lett 2013,6(4):1350048.CrossRef 5. Li QH, Wu JH, Tang QW, Lan Z, Li PJ, Lim JM, Fan LQ: Application of microporous polyaniline counter electrode for dye-sensitized solar cells. Electrochem Commun 2008, 10:1299–1302.CrossRef 6. Bu CH, Tai QD, Liu YM, Guo SS, Zhao XZ: A transparent and stable polypyrrole counter electrode for dye-sensitized solar cell. J Power Sources 2013, 221:78–83.CrossRef 7. Lee KS, Lee HK, Wang DH, Park NG, Lee JY, Park OO, Park JH: Dye-sensitized solar cells with Pt- and TCO-free counter electrodes.

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