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Light harvesting in silicon(111) surfaces using covalently attached protoporphyrin IX dyes

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • Nicholas Alderman
  • Lefteris Danos
  • Liping Fang
  • Martin C. Grossel
  • Tom Markvart
<mark>Journal publication date</mark>18/11/2017
<mark>Journal</mark>Chemical Communications
Issue number89
Number of pages4
Pages (from-to)12120-12123
Publication StatusPublished
Early online date19/10/17
<mark>Original language</mark>English


We report the photosensitization of crystalline silicon via energy transfer using covalently attached protoporphyrin IX (PpIX) derivative molecules at different distances via changing the diol linker to the surface. The diol linker molecule chain length was varied from 2 carbon to 10 carbon lengths in order to change the distance of PpIX to the Si(111) surface between 6 A and 18 A. Fluorescence quenching as a function of the PpIX-Si surface distance showed a decrease in the fluorescence lifetime by almost two orders of magnitude at the closest separation. The experimental fluorescence lifetimes are explained theoretically by a classical Chance-Prock-Silbey model. At a separation below 2 nm, we observe for the first time, a Forster like dipole-dipole energy transfer with a characteristic distance of R-o = 2.7 nm.

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© Royal Society of Chemistry 2017