Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
We aim to realize DSC fabricated by spraying method which is suitable for the curved surface of large area, for example of car bodies and tiled roofs of various kinds of colors. In this time, we investigated main parameters related with the high conversion efficiency and the long-time stability, and obtained several important results.
As the procedure of an experiment TiO2 film was formed on a glass substrate by spraying method. After coating, heat treatment was performed at 723.15K in the atmosphere. N719 was used for a dye which is an important component of DSC. And carbon film was formed on a substrate as the opposite electrode. Both substrates were fixed at a constant distance by the spacer adhesion layer and the iodine-based electrolyte was inserted into the gap. In order to investigate the influence of the burning temperature of TiO2 film to the power generation efficiency, several samples were prepared. On the other hand, in order to investigate the reliability of DSC, we focused on both parameters of the crystal type and the heat treatment condition before splaying. The performance was evaluated by I-V characteristics measured under the condition of the solar simulator with AM1.5 light irradiation. For the evaluation of the film degradation, we incorporated the novel laser light transmitting method of which results showed a good relationship with the crack density in the film.
The following results were obtained: The power generation efficiency variation with the substrate firing temperature is shown in Fig.1. Also, the transmitted light intensity variations with both parameters of the existence of the substrate heating prior to TiO2 coating and the crystal types of TiO2 are shown in Fig.2. In the case of the cell conversion efficiency, the highest value, 5.3% was attained.
In conclusion, followings were found to be clear. (1) The power generation efficiency of DSC depends on the substrate firing temperature; (2) The substrate heating before spraying of TiO2 is effective for the improvement of the DSC degradation by suppressing the crack increasing in TiO2; (3) The crystal structure of TiO2 is also related to the DSC degradation; (4) This Fig.2 indicates the possibility of the procedure of substrate heat treatment could be skipped with the brookite type. We will continue to study about the improvement of the conversion efficiency and the long-term reliability of DSC for the purpose of novel applications.
[1] S. Ito et al.: The 60st JSAP Spring Meeting 30a- PB2-23(2013) [2] H. Yoshida et al.: The 74st JSAP Autumn Meeting 18a-P6-18(2013)
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