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A Surface Photovoltage Study of Char...

De Denko, Alexandra Tucker.

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A Surface Photovoltage Study of Charge Separation in Dye-sensitized Solar Cells and Doped Bismuth Vanadate Photocatalysts for Solar Energy Conversion.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A Surface Photovoltage Study of Charge Separation in Dye-sensitized Solar Cells and Doped Bismuth Vanadate Photocatalysts for Solar Energy Conversion./
作者:	De Denko, Alexandra Tucker.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	136 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-03, Section: B.
Contained By:	Dissertations Abstracts International81-03B.
標題:	Inorganic chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13863071
ISBN:	9781085796088

A Surface Photovoltage Study of Charge Separation in Dye-sensitized Solar Cells and Doped Bismuth Vanadate Photocatalysts for Solar Energy Conversion.
De Denko, Alexandra Tucker.

A Surface Photovoltage Study of Charge Separation in Dye-sensitized Solar Cells and Doped Bismuth Vanadate Photocatalysts for Solar Energy Conversion. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 136 p.

Source: Dissertations Abstracts International, Volume: 81-03, Section: B.

Thesis (Ph.D.)--University of California, Davis, 2019.

This item is not available from ProQuest Dissertations & Theses.

Dye-sensitized solar cells (DSSCs) and water splitting photocatalysts represent emerging third generation technologies for the conversion of solar energy into electricity and fuels. However, the efficiency of these devices is still limited by poor charge carrier separation and charge carrier recombination. This dissertation discusses the application of surface photovoltage spectroscopy (SPS), photoelectrochemical (PEC), and irradiation measurements to assess the performance of such systems and to suggest methods for improving it. Chapters 2 and 3 cover the use of SPS to study photochemical charge separation in dye-sensitized solar cells (DSSCs). Chapter 2 focuses on fluorenyl-thiophene dye (OD-8)-sensitized ZnO films. Electron injection at the ZnO/OD-8 interface and hole injection at the OD-8/I-/I3- and OD-8/[Co(2,2'-bipyridyl)3]3+/2+ (CoII/III) interfaces can be observed as negative photovoltages. By comparing the observed photovoltage with the theoretical one, charge separation efficiencies can be calculated for these processes. The study confirms the importance of the redox couple for charge separation to occur.Chapter 3 focuses on the optical properties and photovoltage generation with amine substituted perylene dyes on ZnO surfaces. Using energy diagrams, the SPS charge transfer efficiencies for the ZnO+Perylenes+I-/I3- and ZnO+Perylenes+CoII/III films were found to be 38-46% and 71-98%, respectively. A comparison of these results with current voltage data for the fully assembled ZnO+Dye+I-/I3- DSSCs reveals that incomplete charge separation limits the cell performance. Fully assembled DSSCs were studied to evaluate cell performance and dye loading as functions of time and the formation of aggregates.Chapters 4 and 5 study the effect of titanium and silicon doping and thermal annealing conditions on the photocatalytic water oxidation abilities of bismuth vanadate (BiVO4). The doped materials were synthesized by solid-state methods, followed by annealing in argon or in air. To determine if the doping was effective, electron dispersive x-ray spectroscopy (EDX), SPS, UV-Vis DRS, photoelectrochemical (PEC) measurements, and oxygen evolution irradiation experiments were performed.In Chapter 4, while SPS results suggested that the charge separation abilities for the undoped BiVO4 were better than those of the Ti:BiVO4 samples, the oxygen evolution results generally indicated that titanium doping is an effective strategy for improving the photocatalytic performance of BiVO4 without affecting the optical bandgap energy of the material (Eg ~2.47 eV).In Chapter 5, BiVO4 was doped with low and medium amounts of silicon (low Si:BiVO4 and medium Si:BiVO4, respectively). As opposed to the Ti:BiVO4 samples, the Si:BiVO4 samples generally outperformed the undoped BiVO4 in terms of SPS, PEC, and oxygen evolution performance, showing that silicon is a suitable dopant for improving the performance of BiVO4. To the best of our knowledge, this work is the first to report the synthesis of Si:BiVO4.

ISBN: 9781085796088Subjects--Topical Terms:

3173556
Inorganic chemistry.
Subjects--Index Terms:

Bismuth vanadate

A Surface Photovoltage Study of Charge Separation in Dye-sensitized Solar Cells and Doped Bismuth Vanadate Photocatalysts for Solar Energy Conversion.
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520 $a Dye-sensitized solar cells (DSSCs) and water splitting photocatalysts represent emerging third generation technologies for the conversion of solar energy into electricity and fuels. However, the efficiency of these devices is still limited by poor charge carrier separation and charge carrier recombination. This dissertation discusses the application of surface photovoltage spectroscopy (SPS), photoelectrochemical (PEC), and irradiation measurements to assess the performance of such systems and to suggest methods for improving it. Chapters 2 and 3 cover the use of SPS to study photochemical charge separation in dye-sensitized solar cells (DSSCs). Chapter 2 focuses on fluorenyl-thiophene dye (OD-8)-sensitized ZnO films. Electron injection at the ZnO/OD-8 interface and hole injection at the OD-8/I-/I3- and OD-8/[Co(2,2'-bipyridyl)3]3+/2+ (CoII/III) interfaces can be observed as negative photovoltages. By comparing the observed photovoltage with the theoretical one, charge separation efficiencies can be calculated for these processes. The study confirms the importance of the redox couple for charge separation to occur.Chapter 3 focuses on the optical properties and photovoltage generation with amine substituted perylene dyes on ZnO surfaces. Using energy diagrams, the SPS charge transfer efficiencies for the ZnO+Perylenes+I-/I3- and ZnO+Perylenes+CoII/III films were found to be 38-46% and 71-98%, respectively. A comparison of these results with current voltage data for the fully assembled ZnO+Dye+I-/I3- DSSCs reveals that incomplete charge separation limits the cell performance. Fully assembled DSSCs were studied to evaluate cell performance and dye loading as functions of time and the formation of aggregates.Chapters 4 and 5 study the effect of titanium and silicon doping and thermal annealing conditions on the photocatalytic water oxidation abilities of bismuth vanadate (BiVO4). The doped materials were synthesized by solid-state methods, followed by annealing in argon or in air. To determine if the doping was effective, electron dispersive x-ray spectroscopy (EDX), SPS, UV-Vis DRS, photoelectrochemical (PEC) measurements, and oxygen evolution irradiation experiments were performed.In Chapter 4, while SPS results suggested that the charge separation abilities for the undoped BiVO4 were better than those of the Ti:BiVO4 samples, the oxygen evolution results generally indicated that titanium doping is an effective strategy for improving the photocatalytic performance of BiVO4 without affecting the optical bandgap energy of the material (Eg ~2.47 eV).In Chapter 5, BiVO4 was doped with low and medium amounts of silicon (low Si:BiVO4 and medium Si:BiVO4, respectively). As opposed to the Ti:BiVO4 samples, the Si:BiVO4 samples generally outperformed the undoped BiVO4 in terms of SPS, PEC, and oxygen evolution performance, showing that silicon is a suitable dopant for improving the performance of BiVO4. To the best of our knowledge, this work is the first to report the synthesis of Si:BiVO4.
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