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Photoelectrochemical Properties of Doubly beta-Functionalized Porphyrin Sensitizers for Dye-Sensitized Nanocrystalline-TiO2 Solar Cells

Park, Jong Kang and Lee, Hye Ryun and Chen, Jinping and Shinokubo, Hiroshi and Osuka, Atsuhiro and Kim, Dongho (2008) Photoelectrochemical Properties of Doubly beta-Functionalized Porphyrin Sensitizers for Dye-Sensitized Nanocrystalline-TiO2 Solar Cells. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (42). pp. 16691-16699.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp804258q

Abstract

Functionalized porphyrins at meso- and beta-positions with different carboxylic acid groups were prepared to investigate electronic and photovoltaic properties as dye-sensitized nanocrystalline-TiO2 solar cells. The electronic structures of the porphyrin macrocyclic core are strongly coupled with olefinic side chains so that the absorption spectrum exhibits largely broad and red-shifted Soret and Q-bands, especially up to 475 nm at the Soret band in a porphyrin doubly functionalized with malonic diacid groups. Among porphyrin derivatives prepared in this study, 2b-bdta-Zn exhibits the maximum overall conversion efficiency of 3.03% and the maximum incident photon to current efficiency of 60. 1% in the Soret band region, superior to the others. From such photovoltaic performances, we can suggest that multiple pathways through olefinic side chains at two beta-positions enhance the overall electron injection efficiency and the moderate distance between the porphyrin sensitizer and the TiO2 semiconductor layer is important, retarding the charge recombination processes. As a consequence, these combined effects give rise to higher photovoltaic efficiency in photovoltaic regenerative solar cells.

Item Type:Article
Subjects:Technology > Nanotechnology and energy applications
Physical Science > Photonics
ID Code:1910
Deposited By:Farnush Anwar
Deposited On:16 Dec 2008 12:18
Last Modified:16 Dec 2008 12:18

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