Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 8, Pages 3729-3738Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp309225v
Keywords
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Funding
- NIMS internal project
- MEXT program for development of environmental technology using nanotechnology
- WPI of MEXT
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This work reports an extensive study about the effects of thermal treatments on the performance of TiO2-based dye-sensitized solar cells. The morphologic, structural, luminescence, and electrical properties of the as-prepared TiO2 electrode are first analyzed by using several diagnostic techniques. In particular, by extensive cathodoluminescence and photocurrent measurements it is possible to determine the energy band diagram of the material intragap levels and to observe their influence in both radiative and photoinduced transport properties. The TiO2 electrodes have been annealed at 500 degrees C for 1, 4, and 8 h in argon or in oxygen environment and then used to develop different DSSCs. The oxygen annealed solar cells show a monotonic increase in the efficiency from 6.75 up to 7.30; meanwhile, the argon-annealed solar cells have an efficiency that remains slightly constant around 6.85. By comparing the behavior of all cells parameters with the CL properties of the annealed TiO2 electrodes, it is possible to determine a correspondence between the short circuit current densities of the DSSCs and the variation of the intragap states in the semiconductor layer induced by annealing.
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