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

Alderman, Nicholas and Danos, Lefteris and Fang, Liping and Grossel, Martin C. and Markvart, Tom (2017) Light harvesting in silicon(111) surfaces using covalently attached protoporphyrin IX dyes. Chemical Communications, 53 (89). pp. 12120-12123. ISSN 1359-7345

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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.

Item Type:
Journal Article
Journal or Publication Title:
Chemical Communications
Additional Information:
© Royal Society of Chemistry 2017
Uncontrolled Keywords:
?? electronic-energy transferterminated monolayersdistance dependencecrystalline siliconorganic monolayerssemiconductorsensitizationhybridizationporphyrinssi(111)materials chemistrysurfaces, coatings and filmsmetals and alloysceramics and compositeschemistry ??
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Deposited On:
29 Nov 2017 17:02
Last Modified:
31 Dec 2023 00:53