X-ray absorption spectroscopy of biomimetic dye molecules for solar cells

The Journal of Chemical Physics
Peter L CookFranz J Himpsel

Abstract

Dye-sensitized solar cells are potentially inexpensive alternatives to traditional semiconductor solar cells. In order to optimize dyes for solar cells we systematically investigate the electronic structure of a variety of porphyrins and phthalocyanines. As a biological model system we use the heme group in cytochrome c which plays a role in biological charge transfer processes. X-ray absorption spectroscopy of the N 1s and C 1s edges reveals the unoccupied molecular orbitals and the orientation of the molecules in thin films. The transition metal 2p edges reflect the oxidation state of the central metal atom, its spin state, and the ligand field of the surrounding N atoms. The latter allows tuning of the energy position of the lowest unoccupied orbital by several tenths of an eV by tailoring the molecules and their deposition. Fe and Mn containing phthalocyanines oxidize easily from +2 to +3 in air and require vacuum deposition for obtaining a reproducible oxidation state. Chlorinated porphyrins, on the other hand, are reduced from +3 to +2 during vacuum deposition at elevated temperatures. These findings stress the importance of controlled thin film deposition for obtaining photovoltaic devices with an optimum match between t...Continue Reading

References

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Citations

Mar 19, 2014·Journal of the American Chemical Society·Sebastian StepanowPietro Gambardella
Jun 7, 2011·The Journal of Chemical Physics·Peter L CookF J Himpsel
Jan 19, 2011·The Journal of Chemical Physics·B WattsH Ade
Aug 3, 2011·The Journal of Chemical Physics·Phillip S JohnsonF J Himpsel
Dec 9, 2009·The Journal of Chemical Physics·Peter L CookF J Himpsel
Feb 8, 2013·The Journal of Chemical Physics·Phillip S JohnsonF J Himpsel
Mar 25, 2014·The Journal of Chemical Physics·Phillip S JohnsonPeter L Cook
Sep 4, 2012·The Journal of Chemical Physics·Sareh AhmadiMats Göthelid
Oct 13, 2017·Journal of Molecular Modeling·Assia Bourouina, Mâammar Rekhis
Sep 12, 2012·Journal of Physics. Condensed Matter : an Institute of Physics Journal·C F HermannsW Kuch
Jun 26, 2014·Physical Chemistry Chemical Physics : PCCP·Jigang ZhouHongjie Dai

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Methods Mentioned

BETA
x-ray

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