Investigation of TiO
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概要
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We have investigated modification of TiO<inf>2</inf>surfaces with [6,6]-phenyl-C<inf>61</inf>-butyric acid (PCBA) used for fabrication of TiO<inf>2</inf>/poly(3-hexylthiophene-2,5-diyl) (P3HT) hybrid solar cells. The surface modification process was monitored using in-situ infrared absorption spectroscopy in the multiple-internal reflection geometry (MIR-IRAS). IR data showed that longer exposure of TiO<inf>2</inf>surfaces to an organic solution of PCBA leads to undesirable formation of a physisorbed PCBA overlayer that cannot be removed by rinsing the surface in pure solvent. We found that ultrasonic cleaning of the TiO<inf>2</inf>surface removed most of the physisorbed PCBA molecules. Modification of TiO<inf>2</inf>surfaces with PCBA molecules drastically increased the short circuit current of TiO<inf>2</inf>/P3HT-based hybrid solar cells, which is ascribed to improved charge separation efficiency at the TiO<inf>2</inf>/P3HT interface. The physisorbed PCBA molecules decreased the open circuit voltage and the fill factor. We demonstrated that the power conversion efficiency is improved by ultrasonic cleaning following PCBA deposition.
- 2013-11-25
著者
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KIMURA Yasuo
Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Toho
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NIWANO Michio
Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Toho
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Kimura Yasuo
Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
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Tadaki Daisuke
Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
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Kojima Ryota
Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Ma Teng
Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
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Zhang Jinyu
Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
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