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Investigations of advanced photochem...

Tang, Jing.

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Investigations of advanced photochemical and photovoltaic material structures.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Investigations of advanced photochemical and photovoltaic material structures./
Author:	Tang, Jing.
Description:	162 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4781.
Contained By:	Dissertation Abstracts International65-09B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3145766
ISBN:	9780496035656

Investigations of advanced photochemical and photovoltaic material structures.
Tang, Jing.

Investigations of advanced photochemical and photovoltaic material structures. - 162 p.

Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4781.

Thesis (Ph.D.)--University of California, Santa Barbara, 2004.

In this thesis, a complete crystallization of an ordered mesoporous titania film was successfully achieved using carbon as a confining material to prevent framework deconstruction during high-temperature calcination. The resulting films were investigated for applications in water-photolysis, decomposition of organic molecules, and dye-sensitized solar cells (DSSC), and they showed significantly enhanced photocatalytic activities.

ISBN: 9780496035656Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Investigations of advanced photochemical and photovoltaic material structures.
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035 $a (UnM)AAI3145766
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100 1 $a Tang, Jing. $3 1910920
245 1 0 $a Investigations of advanced photochemical and photovoltaic material structures.
300 $a 162 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4781.
500 $a Chairs: Galen D. Stucky; Eric W. McFarland.
502 $a Thesis (Ph.D.)--University of California, Santa Barbara, 2004.
520 $a In this thesis, a complete crystallization of an ordered mesoporous titania film was successfully achieved using carbon as a confining material to prevent framework deconstruction during high-temperature calcination. The resulting films were investigated for applications in water-photolysis, decomposition of organic molecules, and dye-sensitized solar cells (DSSC), and they showed significantly enhanced photocatalytic activities.
520 $a Another chemistry approach was also exploited for the synthesis of high-surface-area TiO2 for the DSSC application. Single-crystal titanium glycolate nano-ribbons were synthesized using organometallic precursors and using ethylene glycol as both solvent and template. The resulted nano-ribbons were transformed to anatase in the form of nanoparticles (<5 nm) after heat treatment without altering their macroscopic nano-ribbon morphology. These nanoparticulate anatase nano-ribbons were fabricated into a DSSC device and showed &sim;8% power conversion efficiency under standard solar illumination.
520 $a A new solid-state titania photovoltaic structure, surface sensitized Schottky barrier solar cell, is proposed, which may take advantage of both the solid-state junction cell and the sensitization principle from the conventional DSSC. In this new configuration, photon absorption occurs in photoreceptors deposited on the surface of an ultrathin metal-semiconductor junction Schottky diode. Photoexcited electrons are transferred to the metal and travel ballistically to and over the Schottky barrier, providing the photocurrent output. Unlike conventional solid-state cells, the semiconductor in this device serves only for majority charge transport and separation. Prototype devices were fabricated using merbromin dye molecules on a Au/TiO2/Ti multi-layer structure. An external quantum efficiency of 1.6% and an internal quantum efficiency of 10% were achieved under standard sun illumination. To eliminate the need for an organic photosensitizer, CdSe/CdS core/shell quantum dots (QD) were used to replace the organic dyes and serve as the photoreceptors. The tunable optical properties, together with the surface coupling flexibilities, offer a QD-based device with added advantages over the corresponding dye-system. High QD coverage of approximately 77% was obtained by appropriate surface modification and the adoption of molecular linkers. The external quantum efficiency was 1.2%. This alternative approach to photovoltaic energy conversion shows promise for development of the next generation of durable low-cost solar cells using a variety of materials. (Abstract shortened by UMI.)
590 $a School code: 0035.
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0794
710 2 0 $a University of California, Santa Barbara. $3 1017586
773 0 $t Dissertation Abstracts International $g 65-09B.
790 1 0 $a Stucky, Galen D., $e advisor
790 1 0 $a McFarland, Eric W., $e advisor
790 $a 0035
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3145766