Photoelectrochemical properties of doubly β-functionalized porphyrin sensitizers for dye-sensitized nanocrystalline-TiO2 solar cells

Jong Kang Park, Hye Ryun Lee, Jinping Chen, Hiroshi Shinokubo, Atsuhiro Osuka, Dongho Kim

Research output: Contribution to journalArticle

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Abstract

Functionalized porphyrins at meso- and β-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 β-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.

Original languageEnglish
Pages (from-to)16691-16699
Number of pages9
JournalJournal of Physical Chemistry C
Volume112
Issue number42
DOIs
Publication statusPublished - 2008 Oct 23

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Porphyrins
porphyrins
Solar cells
Coloring Agents
Dyes
solar cells
dyes
Electron injection
Carboxylic Acids
Carboxylic acids
carboxylic acids
Conversion efficiency
Electronic structure
Absorption spectra
Photons
retarding
injection
Semiconductor materials
electronic structure
Derivatives

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Park, Jong Kang ; Lee, Hye Ryun ; Chen, Jinping ; Shinokubo, Hiroshi ; Osuka, Atsuhiro ; Kim, Dongho. / Photoelectrochemical properties of doubly β-functionalized porphyrin sensitizers for dye-sensitized nanocrystalline-TiO2 solar cells. In: Journal of Physical Chemistry C. 2008 ; Vol. 112, No. 42. pp. 16691-16699.
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Photoelectrochemical properties of doubly β-functionalized porphyrin sensitizers for dye-sensitized nanocrystalline-TiO2 solar cells. / Park, Jong Kang; Lee, Hye Ryun; Chen, Jinping; Shinokubo, Hiroshi; Osuka, Atsuhiro; Kim, Dongho.

In: Journal of Physical Chemistry C, Vol. 112, No. 42, 23.10.2008, p. 16691-16699.

Research output: Contribution to journalArticle

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