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Supramolecular Multichromophoric Dye Sensitized Solar Cells

Title: Supramolecular Multichromophoric Dye Sensitized Solar Cells.
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Name(s): Goodson, Flynt, author
Saha, Sourav, professor directing dissertation
Siegrist, Theo, university representative
Zhu, Lei, committee member
Mattoussi, Hedi, committee member
Department of Chemistry and Biochemistry, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2014
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Global demand for clean sustainable energy is growing with the planet's population. While fossil fuels are the current standard, many are looking to the nearly endless energy supplied by the Sun. Because of the potential cost benefit over conventional silicon solar cells, dye sensitized solar cells (DSSCs) are a popular research topic. In Chapter One, current fuel sources and cost as well as the present DSSC research are discussed. A description and explanation of DSSC device principles are also provided. Chapter Two provides an overview of the challenges for DSSC and ways these might be overcome: multichromophoric absorption, better charge injection, donor-acceptor charge separation. In Chapter Three the synthetic schemes and methods for the dye molecules are discussed. Characterization of these dyes by 1H and 13C NMR and mass spectrometry are also presented. In Chapter Four, individual dyes are assembled into Zinc-porphyrin***peryleneimide and zinc phthalocyanine***peryleneimide dyads in solution. The dyads as well as individual dyes will be characterized in solution by UV-vis, NMR, and electrochemical techniques to measure the absorption, binding constants, and redox potentials. Chapter Five describes how DSSC are constructed from a dye coated working electrode, platinized indium tin oxide (Pt/ITO) counter electrode, and I−/I3− redox mediator. The TiO2-coated F: SnO2 (FTO), working electrode was functionalized with supramolecular dyad systems in a two-step process. Then Current/Voltage relationship and Incident Photon to Current Conversion Efficiency of the DSSC devices were measured. These measurements found that multichromphoric dye-sensitized solar cells (DSSCs) based on self-assembled zinc-porphyrin***peryleneimide and zinc phthalocyanine***peryleneimide dyads exhibit higher device efficiency than individual dye DSSCs. The novel ZnPc***peryleneimide system has the highest reported efficiency (η = 2.3%) among DSSCs made of supramolecular dyad chromophores. Increased efficiency of dyad systems can be attributed to co-sensitization as well as vectorial electron transfer that lead to better electron-hole separation in the device. Chapter Six describes how the electron deficient 3,4,9,10-perylenediimide (PDI-12) selectively undergoes thermal ET from strong Lewis basic OH− and F− anions, but remains electronically and optically silent to poor Lewis basic anions, as ET and CT events are turned OFF. These interactions have been fully characterized by UV/Vis, NMR, and EPR spectroscopies. These results demonstrate the generality of anion-induced ET events in aprotic solvents, as long as the electronic requirements are satisfied.
Identifier: FSU_migr_etd-8991 (IID)
Submitted Note: A Dissertation submitted to the Department of Chemistry and Biochemistry in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Degree Awarded: Summer Semester, 2014.
Date of Defense: June 2, 2014.
Keywords: DSSC, Self-Assemble, Supramolecular
Bibliography Note: Includes bibliographical references.
Advisory Committee: Sourav Saha, Professor Directing Dissertation; Theo Siegrist, University Representative; Lei Zhu, Committee Member; Hedi Mattoussi, Committee Member.
Subject(s): Chemistry
Biochemistry
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8991
Owner Institution: FSU

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Goodson, F. (2014). Supramolecular Multichromophoric Dye Sensitized Solar Cells. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-8991