Mechanisms of suppression and enhancement of photocurrent/conversion efficiency in dye-sensitized solar-cells using carotenoid and chlorophyll derivatives as sensitizers.

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Yasushi KoyamaHiroyoshi Nagae

Abstract

The mechanisms of suppression and enhancement of photocurrent/conversion efficiency (performance) in dye-sensitized solar cells, using carotenoid and chlorophyll derivatives as sensitizers, were compared systematically. The key factor to enhance the performance was found to be how to minimize interaction among the excited-state dye-sensitizer(s). In a set of retinoic-acid (RA) and carotenoic-acid (CA) sensitizers, having n conjugated double bonds, CA7 gave rise to the highest performance, which was reduced toward RA5 and CA13. The former was ascribed to the generation of triplet and the resultant singlet-triplet annihilation reaction, while the latter, to the intrinsic electron injection efficiency. In a set of shorter polyene sensitizers having different polarizabilities, the one with the highest polarizability (the highest trend of aggregate formation) exhibited the higher performance toward the lower dye concentration and the lower light intensity, contrary to our expectation. This is ascribed to a decrease in the singlet-triplet annihilation reaction. The performance of cosensitization, by a pair of pheophorbide sensitizers without and with the central metal, Mg or Zn, was enhanced by the light absorption (complementary rat...Continue Reading

Citations

Sep 26, 2015·Bioorganic & Medicinal Chemistry·Shin Ogasawara, Hitoshi Tamiaki
Apr 10, 2015·Chemical Society Reviews·Giuseppe CalogeroFrancesco Bonaccorso
Aug 31, 2013·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·P SenthilkumarP M Anbarasan

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