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Excited State Dynamics of Model Photovoltaic Materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Excited State Dynamics of Model Photovoltaic Materials.
作者:	Swedin, Rachel Katherine.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, 2020
面頁冊數:	324 p.
附註:	Source: Dissertations Abstracts International, Volume: 82-09, Section: B.
附註:	Advisor: Blank, David A.
Contained By:	Dissertations Abstracts International82-09B.
標題:	Physical chemistry.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28257096
ISBN:	9798582531784

Excited State Dynamics of Model Photovoltaic Materials.
Swedin, Rachel Katherine.

Excited State Dynamics of Model Photovoltaic Materials. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 324 p.

Source: Dissertations Abstracts International, Volume: 82-09, Section: B.

Thesis (Ph.D.)--University of Minnesota, 2020.

This item must not be sold to any third party vendors.

Investigation of new materials for potential use in organic photovoltaics and dye-sensitized solar cells found unique systems that maintained a relatively long-lived (ns and longer) charge separated state or energy transferred state. The molecules studied in this thesis show promise for use in organic photovoltaics or dye-sensitized solar cells. Further studies in the solid state of these molecules are required to determine their efficiency andtheir ability to function in a photovoltaic module. Chapter 1 gives an overview of the status of energy usage in the world and how photovoltaics fit into it. This chapter also explains the key scientific concepts used for interpretation of experiments. Chapter 2 goes through an in-depth description of the experimental techniques and processes used in this thesis.Chapter 3 examines a thiophene- and furan-based dye when in an equimolar mixture with varying sizes of ZnO nanoparticles. A long-lived charge-separated state is found when both dyes are coordinated to the ZnO nanoparticles, showing a spectral signature of electron transfer from the thiophene and furan-based dyes to the ZnO. The charge-separated state exists beyond the time delay for the experiment (3.5 ns), indicating promise for a dye-sensitized solar cell containing these molecules.Investigation into BODIPY molecules for use as an absorber in organic photovoltaics begins with Chapter 4. In Chapter 4, the electron transfer properties from the catechol group to multiple BODIPY derivatives are identified. It is found that rapid electron transfer from the catechol, linked at the boron hub of the BODIPY, to the BODIPY deactivated the excited state from further interaction with surrounding systems, a detail missed in other publications with the same catechol attached to the boron-hub of BODIPY. This conclusion was carried into Chapter 5 where use of the catechol to bridge the fullerene to the BODIPY leads to no interaction with fullerene. This is because the catechol rapidly transferred an electron to the BODIPY and deactivated further electron transfer. Ferrocene added to the BODIPY-fullerene molecule out-competed the catechol for electron transfer to the BODIPY derivative, making a ~200 ps lived electron transfer state. The catechol linker is not the only bridge studied between a BODIPY derivative and fullerene. A pyridone ring connected at the alpha and position of the BODIPY is also used to bridge to fullerene. In this study the fullerene functioned as a triplet sensitizer for the BODIPY, leading to a microsecond lived BODIPY triplet. Lastly, a zinc phthalocyanine is studied when coordinated to a BODIPY derivative and fullerene through a pyridine ring. Spectral and redox evidence shows electron transfer from the phthalocyanine occurred, soon followed by recombination. Energy transfer from the BODIPY to the phthalocyanine was also present, followed by electron transfer back to the BODIPY before decaying to the ground state.

ISBN: 9798582531784Subjects--Topical Terms:

708580
Physical chemistry.
Subjects--Index Terms:

BODIPY

Excited State Dynamics of Model Photovoltaic Materials.
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500 $a Source: Dissertations Abstracts International, Volume: 82-09, Section: B.
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506 $a This item must not be sold to any third party vendors.
520 $a Investigation of new materials for potential use in organic photovoltaics and dye-sensitized solar cells found unique systems that maintained a relatively long-lived (ns and longer) charge separated state or energy transferred state. The molecules studied in this thesis show promise for use in organic photovoltaics or dye-sensitized solar cells. Further studies in the solid state of these molecules are required to determine their efficiency andtheir ability to function in a photovoltaic module. Chapter 1 gives an overview of the status of energy usage in the world and how photovoltaics fit into it. This chapter also explains the key scientific concepts used for interpretation of experiments. Chapter 2 goes through an in-depth description of the experimental techniques and processes used in this thesis.Chapter 3 examines a thiophene- and furan-based dye when in an equimolar mixture with varying sizes of ZnO nanoparticles. A long-lived charge-separated state is found when both dyes are coordinated to the ZnO nanoparticles, showing a spectral signature of electron transfer from the thiophene and furan-based dyes to the ZnO. The charge-separated state exists beyond the time delay for the experiment (3.5 ns), indicating promise for a dye-sensitized solar cell containing these molecules.Investigation into BODIPY molecules for use as an absorber in organic photovoltaics begins with Chapter 4. In Chapter 4, the electron transfer properties from the catechol group to multiple BODIPY derivatives are identified. It is found that rapid electron transfer from the catechol, linked at the boron hub of the BODIPY, to the BODIPY deactivated the excited state from further interaction with surrounding systems, a detail missed in other publications with the same catechol attached to the boron-hub of BODIPY. This conclusion was carried into Chapter 5 where use of the catechol to bridge the fullerene to the BODIPY leads to no interaction with fullerene. This is because the catechol rapidly transferred an electron to the BODIPY and deactivated further electron transfer. Ferrocene added to the BODIPY-fullerene molecule out-competed the catechol for electron transfer to the BODIPY derivative, making a ~200 ps lived electron transfer state. The catechol linker is not the only bridge studied between a BODIPY derivative and fullerene. A pyridone ring connected at the alpha and position of the BODIPY is also used to bridge to fullerene. In this study the fullerene functioned as a triplet sensitizer for the BODIPY, leading to a microsecond lived BODIPY triplet. Lastly, a zinc phthalocyanine is studied when coordinated to a BODIPY derivative and fullerene through a pyridine ring. Spectral and redox evidence shows electron transfer from the phthalocyanine occurred, soon followed by recombination. Energy transfer from the BODIPY to the phthalocyanine was also present, followed by electron transfer back to the BODIPY before decaying to the ground state.
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650 4 $a Materials science. $3 221779
650 4 $a Nanotechnology. $3 193873
653 $a BODIPY
653 $a Charge transfer
653 $a Donor acceptor
653 $a Excited state dynamics
653 $a Pump probe
653 $a Spectroscopy
653 $a Photovoltaic materials
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