Effects of water in the Surface Adsorption of Dye molecules at Nanostructured TiO2

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Fältnamn	Indikatorer	Metadata
000		03221naa a2200265 4500
001		oai:DiVA.org:uu-25906
003		SwePub
008		070214s2006 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-259062 URI
040		a (SwePub)uu
041		a engb eng
042		9 SwePub
072	7	a vet2 swepub-contenttype
072	7	a kon2 swepub-publicationtype
100	1	a Hedlund, Mariau Uppsala universitet,Fysiska institutionen,Fysik I,Fysik14 aut0 (Swepub:uu)mahed424
245	1 0	a Effects of water in the Surface Adsorption of Dye molecules at Nanostructured TiO2
264	1	c 2006
338		a print2 rdacarrier
520		a The dye-sensitized solar cell is a promising new alternative to conventional solar cells. However these molecular solar cells may suffer from long term stability problems. Some of these problems are believed to be linked to the presence of water. Recently, dyes possessing long hydrophobic chains have been introduced, as an effort to come to terms with problems related to water [1]. In this study the Ru-dyes N3, N719 and 520DN (an analog containing hydrophobic chains) bound to TiO2, have after being exposed to water, been investigated by photoelectron spectroscopy (PES). PES was used to understand on a molecular level, how the introduction of water influences the molecular and electronic structure of these dye sensitized surfaces.In general, the surface sensitized with 520DN does not give signs of any major changes after being subjected to water. The investigation therefore found that the hydrophobic chains in the dye surface with 520DN effectively protect the molecular structure of the surface. However the surfaces of N3 and N719 do show large changes after exposing the surface to water. More specifically, it has been found that the outermost molecular orbitals (HOMO), which are vital for the function of the solar cell, are affected by water by shifting towards higher binding energies.Also, changes in the thiocyanate group can be found in the N3 and N719 dyes after being exposed to water. Specifically, the sulphur S2p energy levels have a substantially larger amount of a second spin-orbit split peak after being exposed to water. The nitrogen N1s peak relating to the thiocyanate group also changes shape. Moreover, in the case of N719, the counter ion TBA+ is not present on the dye sensitized surface after being subjected to water.Finally, the amount of dye on the TiO2 surfaces is also important for the efficiency of the solar cell. It was found that the coverage of N3 and N719 dye decreases when exposed to water, but the coverage of the 520DN dye remains the same.
700	1	a Johansson, Eriku Uppsala universitet,Fysiska institutionen,Fysik I4 aut0 (Swepub:uu)erjoh367
700	1	a Siegbahn, Hansu Uppsala universitet,Fysiska institutionen,Fysik I4 aut0 (Swepub:uu)hsi13487
700	1	a Rensmo, Håkanu Uppsala universitet,Fysiska institutionen,Fysik I4 aut0 (Swepub:uu)hakanrm
710	2	a Uppsala universitetb Fysiska institutionen4 org
773	0	t 16th International Conference on Photochemical Conversion and Storage of Solar Energy (IPS-16)
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-25906

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Av författaren/redakt...: Hedlund, Maria; Johansson, Erik; Siegbahn, Hans; Rensmo, Håkan

Artiklar i publikationen: 16th Internation ...

Av lärosätet: Uppsala universitet

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