Explanation of Effect of Added Water on Dye-Sensitized Nanocrystalline TiO2 Solar Cell: Correlation between Performance and Carrier Relaxation Kinetics
ZHAO Hui1, YIN Xiong2, LI Heng1, LIN Yuan2, WENG Yu-Xiang1
1Laboratory of Soft Matter Physics, and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1000802Key Laboratory of Photochemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080
Explanation of Effect of Added Water on Dye-Sensitized Nanocrystalline TiO2 Solar Cell: Correlation between Performance and Carrier Relaxation Kinetics
1Laboratory of Soft Matter Physics, and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1000802Key Laboratory of Photochemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080
摘要Time-resolved mid-IR transient absorption spectroscopy is employed to explore the mechanism of improving the performance of dye-sensitized TiO2 solar cell (DSSC) when a certain amount of H2O is added into the electrolyte. The relaxation kinetics of dye-sensitized TiO2 nanocrystalline film and the corresponding DSSC performance are investigated under different conditions. It is found that the interfacial charge recombination is retarded and electron injection efficiency is increased in the water vapour and in the electrolyte when D2O is added. The values of open-circuit photovoltage Voc and the short-circuit photocurrent Jsc of the cells are linearly correlated to the product of the two decay time constants. We also observed that Voc well correlates with electron injection efficiency. It provides a preliminary microscopic account for the function of the added water in improving the performance of DSSCs.
Abstract：Time-resolved mid-IR transient absorption spectroscopy is employed to explore the mechanism of improving the performance of dye-sensitized TiO2 solar cell (DSSC) when a certain amount of H2O is added into the electrolyte. The relaxation kinetics of dye-sensitized TiO2 nanocrystalline film and the corresponding DSSC performance are investigated under different conditions. It is found that the interfacial charge recombination is retarded and electron injection efficiency is increased in the water vapour and in the electrolyte when D2O is added. The values of open-circuit photovoltage Voc and the short-circuit photocurrent Jsc of the cells are linearly correlated to the product of the two decay time constants. We also observed that Voc well correlates with electron injection efficiency. It provides a preliminary microscopic account for the function of the added water in improving the performance of DSSCs.
ZHAO Hui;YIN Xiong;LI Heng;LIN Yuan;WENG Yu-Xiang. Explanation of Effect of Added Water on Dye-Sensitized Nanocrystalline TiO2 Solar Cell: Correlation between Performance and Carrier Relaxation Kinetics[J]. 中国物理快报, 2007, 24(11): 3272-3275.
ZHAO Hui, YIN Xiong, LI Heng, LIN Yuan, WENG Yu-Xiang. Explanation of Effect of Added Water on Dye-Sensitized Nanocrystalline TiO2 Solar Cell: Correlation between Performance and Carrier Relaxation Kinetics. Chin. Phys. Lett., 2007, 24(11): 3272-3275.
[1] Linsebigler A L et al 1995 Chem. Rev. 95 735 [2] Fujishima A, Rao T N and Tryk D A 2000 J. Photochem.Photobiol. C I 1 [3] Gr\"atzel M 2005 Inorg. Chem. 44 6841 [4] Nazeeruddin M K et al 2005 J. Am. Chem. Soc. 127 16835 [5] Wang Q et al 2006 J. Phys. Chem. B 110 25210 [6] Weidmann J et al 1999 Solar Energy Mater. Solar Cells 56 153 [7] Wang Z S, Li F YandHuang C H 2000 Chem. Commun. 20 2063 [8] Bach U et al 1998 Nature 395 583 [9] Wang P et al 2003 J. Am. Chem. Soc. 125 1166 [10] Yang H et al 2006 Chem. Mater. 18 5173 [11] Chen Z G et al 2007 J. Mater. Chem. 14 1602 [12] Mikoshiba S et al 2002 Chem. Lett. 31 1156 [13] Liu Y et al 1998 Solar Energy Mater. Solar Cells 55 267 [14] Ghosh H N, Weng Y X and Lian T 1998 J. Phys. Chem. B 10210208 [15] Weng Y X et al 2000 J. Phys. Chem. B 104 93 [16] Zhao H, Zhang Q L and Weng Y X 2007 J. Phys. Chem. C 111 3762 [17] O'Regan B et al 1990 J. Phys. Chem. 94 8720 [18] Nazeeruddin M K et al 1993 J. Am. Chem. Soc. 115 6382 [19] Murai S et al 2002 J. Photochem. Photobiol. A 148 33 [20] Perkowitz S 1993 Optical Characterization ofSemiconductors (London: Academic) [21] Smith R A 1978 Semiconductors (Cambridge: Cambridge University) [22] Henrich V E, Dresselhaus G and Zeiger H J 1977 SolidState Commun. 24 623 [23] Huang S Y et al 1997 J. Phys. Chem. B 101 2576 [24] Enright B, Redmond G and Fitzmaurice D 1994 J. Phys. Chem. 986195 [25] Redmond G and Fitzmaurice D 1993 J. Phys. Chem. 97 1426 [26] Moser J E and Gr\"atzel M 1993 J. Phys. Chem. 176 493 [27] Weng Y X et al 2003 J. Phys. Chem. B 107 4356 [28] Du L C and Weng Y X 2007 J. Phys. Chem. C 111 4567 [29] Haque S A et al 2005 J. Am. Chem. Soc. 127 3456 [30] Kroeze J E et al 2006 J. Am. Chem. Soc. 128 16376 [31] Hattori S et al 2004 J. Phys. Chem. B 108 15200
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