Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Dye sensitized solar cells (DSSCs) can be considered as a promising future candidate due to the potential of low cost fabrication however, the scaling-up of these cells still is a challenging issue. There are several problematic issues such as the module series resistance, which includes the transparent conducting oxide (TCO) substrate resistance, the counter electrode resistance, and the diffusion resistance of the redox couple in the electrolyte. An important challenge in the scale-up of the dye-sensitized solar cell is related to the significant effect of ohmic losses due to the TCO substrate upon increase in substrate area. This effect can be minimized by incorporating silver collector lines on both the working and the counter electrodes. In this case, the width and distance of Ag lines are important factors in the optimal design of a dye sensitized solar mini-module. In this work, the study of the FTO resistance as a function of distance between the charge collecting contacts is presented and its effect on fill factor and cell efficiency is explained. A cell with an active area of 0.5 cm2 and modules of 4 and 7 strips of TiO2 with total active area of 13.6 and 23.8 cm2, respectively, have been fabricated and the performance parameters such as I-V curves, short circuit current density (JSC), open circuit voltage (VOC), fill factor and the efficiency are reported. The 7-strips mini-module (23.8 cm2) at an optimum width for the Ag lines of 0.60 mm showed a slightly better performance than a small laboratory scale solar cell of 0.5 cm2, related to the smaller distance between the silver collector lines in the module design. The 23.8 cm2 mini-module had a 4.8% efficiency, with a short circuit current of 0.25 A, an open circuit voltage of 0.73 V, and a fill factor of 0.61, resulting in an electrical power of 0.11 W under 1 sun illumination. These results indicate that scale-up of the dye-sensitized solar cell incorporating Ag collector lines is a viable option.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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