Raman spectroscopic study of dye adsorption on TiO2 electrodes of dye-sensitized solar cells |
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| Affiliation: | 1. Advanced Materials Laboratories, Sony Corporation, Atsugi Tec, 4-14-1 Asahi-cho, Atsugi-shi, Kanagawa 243-0014, Japan;2. Production Group, Sony Corporation, Kanagawa, Japan;1. Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 106, Taiwan;2. Institute of Environmental Engineering and Management, National Taipei University of Technology, Taipei 106, Taiwan;3. Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan;4. Department of Environmental Engineering, Tungnan University, New Taipei City 222, Taiwan;5. Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan;1. School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, PR China;2. Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, China;1. Material Analysis Technology Division, Technology R&D Center 2, Corporate R&D Headquarters, Konica Minolta, Inc., No.1 Sakura-machi, Hino-shi, Tokyo 191-8511, Japan;2. Thermo Fisher Scientific K.K., C-2F, 3-9 Moriya-cho, Kanagawa-ku, Yokohama 221-0022, Japan;3. Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA |
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| Abstract: | The state of dye adsorption on TiO2 electrodes in dye-sensitized solar-cell (DSSC) systems is important for its power-conversion efficiency (PCE). We propose a non-destructive and quantitative method to evaluate the amount of adsorbed dye on TiO2 electrodes by using micro-Raman spectroscopy. The Raman peak intensity ratio of adsorbed dye to TiO2, Id/It, is defined as a dye adsorption parameter. Based on a comparison between Id/It and the amount of dye evaluated from UV–vis absorption, the quantitativity and reproducibility of our method are verified.We investigated the change of Id/It spatial distribution of TiO2 electrodes immersed in a dye solution for different time scales. The statistical analysis of Id/It distribution suggests that dyes adsorbed on TiO2 electrodes with chemical coordination increase at first, and after their saturation, dye aggregations are formed over the chemisorption layer. We also describe the effect of the Id/It distribution on PCE. From a comparison of PCE and Id/It distribution obtained from various immersion processes, it was considered that the PCE of DSSCs can be optimized by minimizing the Id/It dispersion. |
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| Keywords: | Micro-Raman spectroscopy Dye-sensitized solar cell Adsorption DSSC" },{" #name" :" keyword" ," $" :{" id" :" kw0030" }," $$" :[{" #name" :" text" ," _" :" dye-sensitized solar cell PCE" },{" #name" :" keyword" ," $" :{" id" :" kw0040" }," $$" :[{" #name" :" text" ," _" :" power-conversion efficiency |
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