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Photocurrents of solar cells sensitized by aggregate-forming polyenes: Enhancement due to suppression of singlet–triplet annihilation by lowering of dye concentration or light intensity |
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| Authors: | Xiao-Feng Wang Yasushi Koyama Hiroyoshi Nagae Yumiko Yamano Masayoshi Ito Yuji Wada |
| Affiliation: | aFaculty of Science and Technology, Kwansei Gakuin University, Department of Chemistry, 2-1 Gakuen, Sanda 669-1337, Japan bKobe City University of Foreign Studies, Gakuen Higashim achi, Nishiku, Kobe 651-2187, Japan cKobe Pharmaceutical University, 4-19-1 Motoyama-Kitamachi, Kobe 658-8558, Japan dDepartment of Material and Life Science, Graduate School of Engineering, Osaka University, Suita 565-0871, Japan |
| Abstract: | Titania-based Grätzel-type solar cells were fabricated by the use of polyene dyes with various transition dipole moments. In the dye having the largest transition dipole among the samples, an aggregate was readily formed through dispersive interaction, and the photocurrent was increased when the dye concentration or the light intensity was lowered. This observation was ascribed to the suppression of the singlet–triplet annihilation reaction. In the dye having the smallest transition dipole, there was no sign of aggregate formation, and the photocurrent was decreased when the dye concentration or the light intensity was lowered. |
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