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Dye-sensitization of nanocrystalline...

Stipkala, Jeremy M.

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Dye-sensitization of nanocrystalline semiconductor electrodes.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Dye-sensitization of nanocrystalline semiconductor electrodes./
Author:	Stipkala, Jeremy M.
Description:	168 p.
Notes:	Source: Dissertation Abstracts International, Volume: 59-01, Section: B, page: 0246.
Contained By:	Dissertation Abstracts International59-01B.
Subject:	Chemistry, Inorganic. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9821201
ISBN:	9780591728545

Dye-sensitization of nanocrystalline semiconductor electrodes.
Stipkala, Jeremy M.

Dye-sensitization of nanocrystalline semiconductor electrodes. - 168 p.

Source: Dissertation Abstracts International, Volume: 59-01, Section: B, page: 0246.

Thesis (Ph.D.)--The Johns Hopkins University, 1998.

Electron transfer from excited sensitizer molecules into colloidal titanium dioxide thin film electrodes in the absence of an intimate covalent bond has been exploited to convert light into electricity. A brief review of research reported in the literature is given, which focuses on the kinetics of interfacial charge transfer events at sensitized sol-gel processed semiconductor particles. It was found that forward electron transfer from the sensitizer to the semiconductor is several orders of magnitude faster than the energy wasting recombination in the most successful systems.

ISBN: 9780591728545Subjects--Topical Terms:

517253
Chemistry, Inorganic.

Dye-sensitization of nanocrystalline semiconductor electrodes.
LDR:02820nam 2200289 a 45 001 969362
005 20110920
008 110921s1998 eng d
020 $a 9780591728545
035 $a (UMI)AAI9821201
035 $a AAI9821201
040 $a UMI $c UMI
100 1 $a Stipkala, Jeremy M. $3 1293415
245 1 0 $a Dye-sensitization of nanocrystalline semiconductor electrodes.
300 $a 168 p.
500 $a Source: Dissertation Abstracts International, Volume: 59-01, Section: B, page: 0246.
502 $a Thesis (Ph.D.)--The Johns Hopkins University, 1998.
520 $a Electron transfer from excited sensitizer molecules into colloidal titanium dioxide thin film electrodes in the absence of an intimate covalent bond has been exploited to convert light into electricity. A brief review of research reported in the literature is given, which focuses on the kinetics of interfacial charge transfer events at sensitized sol-gel processed semiconductor particles. It was found that forward electron transfer from the sensitizer to the semiconductor is several orders of magnitude faster than the energy wasting recombination in the most successful systems.
520 $a The novel results included here detail two new approaches to the problem of immobilizing sensitizers on the surface of the semiconductor. First, linkage ligands 4-methyl-4$\sp\prime$-R-2,2$\sp\prime$-bipyridine, where R = -COOH, -(CH$\sb2)\sb3 $c OOH, and -(CH$\sb2)\sb3 $c OCH$\sb2 $c OOC$\sb2 $h $\sb5$ were synthesized. These ligands were incorporated into the sensitizer Ru$\sp{\rm II}$(dmb)$\sb2 $l L(PF$\sb6)\sb2,$ where dmb = 4,4$\sp\prime$-dimethyl-2,2$\sp\prime$-bipyridine, and LL is the linkage ligand. The performance of these ruthenium sensitizers in regenerative solar cells was measured. It was found that the presence of the propylene spacer slows the recombination of the injected electron in the semiconductor with the oxidized sensitizer by a factor of 3-4.
520 $a Second, electropolymerization of Ru$\sp{\rm II}$(vbpy) compounds, where vbpy is 4-methyl-4$\sp\prime$-vinyl-2,2$\sp\prime$-bipyridine, is explained. If the polymerization conditions are kept within narrow parameters, it is possible to add polymeric sensitizer to the semiconductor electrode and improve the cell performance. It was often observed, however, that the addition of polymer increased the dye surface coverage but lowered light-to-electricity conversion efficiencies. Evidence for self-quenching and iodide diffusion inhibition as mechanistic explanations for the reduced efficiencies from polymeric samples is given.
590 $a School code: 0098.
650 4 $a Chemistry, Inorganic. $3 517253
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0488
690 $a 0494
690 $a 0794
710 2 0 $a The Johns Hopkins University. $3 1017431
773 0 $t Dissertation Abstracts International $g 59-01B.
790 $a 0098
791 $a Ph.D.
792 $a 1998
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9821201