Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Dye-sensitized solar cells (DSSCs), which have been investigated as promising candidates for renewable-energy systems, have attracted great attention in both academic and industrial communities due to their high achievable efficiencies at low cost.1 In addition to the metal complex, the metal-free organic sensitizers have also been desirable due to their wide variety of the structures, facile modification, and high molar absorption coefficient. Importantly, there is still much room for chemists to improve their cell performance by modifying the structure of the metal-free organic sensitizers. A series of “H” type dye sensitizers bearing pyrrole as the conjugated bridge were obtained, in which two pieces of N-arylpyrrole-based organic dye moieties were linked together through various aromatic rings. Excitingly, the topological structures of this “H”-type dyes could be modified by the linkage of different isolation groups, which finally affect their photovoltaic performance, providing a new approach to optimize the chemical structure of dyes to achieve higher conversion efficiency. As a result, the dye aggregates on the TiO2 surface could be suppressed largely, and the solar cells based on these dyes exhibited high conversion efficiencies, which further confirm the advantage of the “H” structure.
Fig.1 the structures of "H" type dye sensitizers
1 O'Regan, B.; Grazel, M. A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films. Nature, 1991, 353, 737-740.
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