How to control the reduction kinetics of dye cation in dye-sensitized solar cells

Shogo Mori^a, Junichi Ogawa^a, Mutsumi Kimura^a, Nagatoshi Koumura^b

^aShinshu University, 3-15-1 Tokida, Ueda, 386-8567, Japan

^bNational Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 1-1-1 Higashi, Ibaraki, 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

Oral, Shogo Mori, presentation 064
Publication date: 5th February 2015

In dye-sensitized solar cells, a lot of energy is lost at semiconductor/dye/electrolyte interfaces. Such energy has been needed to obtain high charge separation efficiency. To reduce dye cation, which is formed after charge injection under light irradiation, typically 0.4 eV is required. However, some dyes require more and some require less. Common factors influencing the kinetics are reorganization energy and electronic coupling. However, there are other factors such as collision frequency and cross section. These are related with how much dye molecules can attract redox species and how large area the dye molecule is exposed to the redox species. To investigate how large impact these parameters could have in comparison to the free energy and reorganization energy, we studied the reduction kinetics of dyes with different length of conjugated linker, with and without alkyl chains, and different donors, and found these parameters actually influence the kinetics a lot. We will present the experimental results in detail and discuss how to increase the reduction rate with decreasing the free energy difference at the charge separation interface.
Transient absorption kinetics of dye cation induced using a pulsed laser. MK-1 and MK-3 with and without redox couple
Ogawa, J. et al Deceleration of dye cation reduction kinetics by adding alkyl chains to the π-conjugated linker of dye molecules ,Japanese Journal of Applied Physics, 53 (2014) 127301

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