Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
The understanding and optimization of charge transfer reactions in electrolytes are of crucial importance for the development of efficient photoelectrochemical devices. In recent work, we demonstrated that dye-sensitized solar cells with a tandem electrolyte system based on the mixture of tris(p-anisyl)amine as redox intermediate in combination with a standard cobalt tris(bipyridyl) redox couple are highly efficient and have the potential to overcome the traditional bottlenecks of these devices.1 In this work, we further explore three new tris(4-alkoxyphenyl)amines intermediates with different lengths of alkoxy chain and investigate their effects on both the solar cell performance and charge-transfer kinetics. The combination of a single D-A-π-A organic dye AQ310 and this series of tandem electrolytes rendered highly efficient solar cells with conversion efficiencies ranging from 9.7% to 11% under one sun illumination. It is notable that this corresponds to an efficiency improvement of up to 50% as compared to a standard cobalt tris(bipyridyl) electrolyte. Moreover, the photo-voltage increase shows a clear dependency on the length of alkoxy chain and values exceeding 1 V are obtained. Detailed charge-transfer studies reveal a retarded recombination kinetics dependent on molecular steric effects and significantly accelerated dye regeneration rate mediated by all of the tris(4-alkoxyphenyl)amines. More importantly, the tandem redox system is proved to be applicable to sensitizers that display rather a fast recombination kinetic, AQ310 in current work. These results highlight the importance of structural design for optimized charge-transfer at the sensitized semiconductor/electrolyte interface and therefore provide vital strategies to develop very efficient Dye-sensitized solar cells.
Reference:
1. Y. Hao, W. Yang, L. Zhang, R. Jiang, E. Mijangos, Y. Saygili, L. Hammarström, A. Hagfeldt and G. Boschloo, Nature Communications, 2016, 7, 13934.
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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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