Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 112, Issue 42, Pages 16691-16699Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp804258q
Keywords
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Funding
- Ministry of Education and Human Resources Development
- MEXT [19205006, 18655013]
- Ministry of Education, Science and Technology and Human Resources Development
- JSPS
- National Research Foundation of Korea [과06A1503, R16-1997-011-01001-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Grants-in-Aid for Scientific Research [18655013] Funding Source: KAKEN
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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.
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