Porphyrins are stable p-aromatic molecules and excellent electron donors, frequently used as building blocks in artificial photosynthesis; their solubility, optical, photophysical and electrochemical properties can be tailored by substitution in the periphery or inner metal complexation. Porphyrins possess an intense Soret band at 400-450 nm and moderate Q bands at 500-650 nm; one hopeful way to overcome the problem relating to the poor light-harvesting properties of porphyrins is to modify the electronic structures of porphyrins, so that one can match the light-harvesting properties with the solar energy spectrum.<br/>Porphyrin-based molecules have been explored for a long time as the active materials in dye-sensitized solar cells and the highest efficiency achieved is 13%. Nevertheless, until the last few years, this family of molecules has been scarcely explored as donor materials in bulk heterojunction (BHJ) organic solar cells (OSCs).<br/>Believing that porphyrin-based molecules should play a more important role in BHJ OSCs) we started a few years ago a project in this field using a careful structural optimization. Here I will present our last results achieving efficiencies close to 10%.

Tailoring porphyrins for highly efficient (>9%) organic solar cells

2019 Spring National Meeting

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