Suitable parameters of I3- ion transport in the electrolytes of dye-sensitized solar cells

Masatoshi Yanagida^a, Mitsunori Honda^a

^aNational Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, 3050047, Japan

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Masatoshi Yanagida, 065
Publication date: 5th February 2015

The dye-sensitzed solar cells (DSCs) have been investigated as practical applications. However, the leakage of the electrolyte solution is a serious problem in this solar cell. The replacement from the electrolyte solution to non-volatile liquid, quasi-solid state, and solid state has been investigated for the long time stability. Though many relable materials ahs been proposed to obtain the efficient and durable devices, the suitable physical parameters such as diffusion coefficient, and the concetration have not been discussed. The short circuit current density (J_SC) is linearly related to the light intensity in general. However, under the limitation of the ion transport in the electrolyte, the current becomes constant against the light intensity as shown in FIgure. In this condition, the colour of I₃^- around the counter electrode is disappeared. The colour is also recovered in the dark condition. The lack of I₃^- around the counter electrode induces the constant current (J^S_SC). The distribution of I₃^- in DSCs was calculated from the diffusion equation of I₃^-. The J_SC becomes J^S_SC when the concetration at counter electrode becomes 0. The J^S_SC is determined by the diffusion coeffcient (D_OX), the concetration (C_OX) of I₃^-, and the distance of the ion transport. These suitable parameters were estimated for favourable ion transport in the DSCs.^1,2 When the saturated concetration of I₃^- in the electrolyte is known, the C_OX value is automatically determined. The theoretical and ideal JSC under illumination of 1 sun is ca. 30 mAcm^-2 estimated from the light harvestiong effciency and the solar light spectrum. Therefore, the favourable D_OX value is also estimated becouse the J^S_SC has to be over 30 mAcm^-2 at least. The thickness of the bulk electrolyte layer is also estimated to obatin the larger J^S_SC value.
The relationship between the current density and light intensity
1, Masatoshi Yanagida, GRE2014 proceedings O-Pv-5-4 2, Masatoshi Yanagida, Adv. Nat. Sci.: Nanosci. Nanotechnol. 2015, 6, 015010.

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