AM1 molecular screening of novel porphyrin analogues as dye-sensitized solar cells

Mannix P. Balanay, Carl Vincent P Dipaling, Sang Hee Lee, Dong Hee Kim, Kee Hag Lee

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

AM1 calculations were used to study the charge-separated state of porphyrin analogues as sensitizers. Initial calculations were performed on the donor and acceptor moieties to determine the molecular orbital (MO) energy levels independently. The analogues were modeled by combining the donor and acceptor moieties. The charge-separated state of the porphyrin analogues was analyzed from the MO energy levels of the donor and acceptor moieties, and from the porphyrin analogues (donor-acceptor pairs). MO spatial orientations were also used to elucidate the charge-separated state of the analogues. Our results revealed that the relative positions of the lowest unoccupied molecular orbital (LUMO) levels of the donor and acceptor moieties could predict the MO spatial orientations of the porphyrin analogues, i.e., the donor-acceptor pairs. The LUMO is localized in the acceptor and the highest occupied molecular orbital (HOMO) in the donor region when the difference between LUMOdonor and LUMOacceptor is positive, which indicates a charge-separated state. Of the molecular models, (Zn-5G) had the smallest HOMO-LUMO gap and had a relative difference of 0.16 eV compared to (Zn-1A), which has a known cell efficiency of 4.8%.

Original languageEnglish
Pages (from-to)1775-1781
Number of pages7
JournalSolar Energy Materials and Solar Cells
Volume91
Issue number19
DOIs
Publication statusPublished - Nov 23 2007
Externally publishedYes

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Keywords

  • Calculations
  • Charge separation
  • DSSC
  • HOMO-LUMO gap
  • Porphyrin

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

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