Ultrafast studies of electron injection in Ru dye sensitized SnO2 nanocrystalline thin film
By using two-color femtosecond transient absorption spectroscopy, we have measured the electron injection rate for bis(tetrabutylammonium) cis di(thiocyanato) bis (2,2’-bypiridine-4,4’ carboxylic acid)Ruthenium (II) dye (called N719) into SnO2 nanocrystalline thin films. The electron injection rate...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2002-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X0200003X |
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| Summary: | By using two-color femtosecond transient absorption spectroscopy, we have measured the
electron injection rate for bis(tetrabutylammonium) cis di(thiocyanato) bis (2,2’-bypiridine-4,4’ carboxylic
acid)Ruthenium (II) dye (called N719) into SnO2 nanocrystalline thin films. The electron injection rate has
been measured by monitoring the formation of the dye oxidized state and the arrival of electrons in the
conduction band. Dynamics of electron injection are multiexponential (0.2, 4 and 130 ps) and are therefore
slower than the N719-ZnO or N719-TiO2 systems. The photocurrent action spectrum of N719-SnO2 shows a quantum efficiency of 0.65 at 530 nm proving that efficient charge separation can take place despite of the
relatively slow electron injection rate. |
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| ISSN: | 1110-662X |