東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Photophysical Properties of Molecule...

Dickenson, John Calvin,

Linked to FindBook

Google Book

Amazon

博客來

Photophysical Properties of Molecules and Materials for Solar Energy Conversion /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Photophysical Properties of Molecules and Materials for Solar Energy Conversion // John Calvin Dickenson.
Author:	Dickenson, John Calvin,
Description:	1 electronic resource (166 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
Contained By:	Dissertations Abstracts International86-11B.
Subject:	Chemistry. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31939367
ISBN:	9798315713807

Photophysical Properties of Molecules and Materials for Solar Energy Conversion /
Dickenson, John Calvin,

Photophysical Properties of Molecules and Materials for Solar Energy Conversion /John Calvin Dickenson. - 1 electronic resource (166 pages)

Source: Dissertations Abstracts International, Volume: 86-11, Section: B.

A confluence of factors including climate change and national energy security necessitate a shift from fossil fuels to renewable sources. One of the most attractive methods is the conversion of sunlight into chemical fuels, called solar energy conversion. This dissertation advances the fundamental photophysical properties of the molecules and materials involved in two applications of solar energy conversion: dye-sensitized photoelectrochemical cells (DSPECs) and silicon-based hybrid photoelectrodes.Chapter 1 describes the photophysical properties of ruthenium polypyridyl complexes-common chromophores in DSPECs-and the semiconductor photophysics which underpin silicon hybrid photoelectrodes.In Chapter 2, excited-state quenching studies in acetonitrile and acetone is used to study the effect of solvent polarity on the Coulombic attraction between iodide and a ruthenium complex decorated with aldehyde groups. Decreased solvent dielectric in acetone solution was shown to induce stronger association, increasing the equilibrium constant by an order of magnitude compared to acetonitrile, as measured by 1H NMR titration assays. The increased degree of association manifested in an increased contribution of static quenching.Chapter 3 leverages time-resolved infrared spectroscopy to understand the excited state behavior of chloride associated with ruthenium polypyridyl complexes decorated with amide groups in dichloromethane. In such complexes, the ground state equilibrium for chloride association was large ~107 M-1. Following laser excitation, the photoluminescence initially resembles the complex with chloride associated but evolves over time indicating photodissociation ("photo-release"). The time-resolved infrared spectra support an increase in the hydrogen bonding as a function of time. A model is proposed in which chloride migrates orthogonally to the plane of the bipyridine ligand in response to the excited-state dipole.Chapter 4 compares three fabrication methods for a silicon/silicon dioxide (Si/SiOx) passivation layer in silicon hybrid photoelectrodes: native oxide, chemically grown oxide, and thermal oxide, grown by rapid thermal annealing. Through time-resolved infrared spectroscopy, electrochemical impedance spectroscopy, and cyclic voltammetry, the rapid thermal annealing was identified as the optimal interface, possessing good electron transfer to a solution mediator, long lifetimes, and reduced surface trap state densities.Collectively, these findings deepen our understanding of molecular and interfacial photophysics, guiding the design of more efficient systems for solar-to-chemical energy conversion.

English

ISBN: 9798315713807Subjects--Topical Terms:

516420
Chemistry.
Subjects--Index Terms:

Renewable energy

Photophysical Properties of Molecules and Materials for Solar Energy Conversion /
LDR:04274nmm a22004573i 4500 001 2431828
005 20250624130500.5
006 m o d
007 cr|nu||||||||
008 261011s2025 miu||||||m |||||||eng d
020 $a 9798315713807
035 $a (MiAaPQD)AAI31939367
035 $a AAI31939367
040 $a MiAaPQD $b eng $c MiAaPQD $e rda
100 1 $a Dickenson, John Calvin, $e author. $3 3820816
245 1 0 $a Photophysical Properties of Molecules and Materials for Solar Energy Conversion / $c John Calvin Dickenson.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2025
300 $a 1 electronic resource (166 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
500 $a Advisors: Meyer, Gerald J.; Miller, Alexander J. M. Committee members: Cahoon, James F.; Dempsey, Jillian L.; Jackson, Megan N.
502 $b Ph.D. $c The University of North Carolina at Chapel Hill $d 2025.
520 $a A confluence of factors including climate change and national energy security necessitate a shift from fossil fuels to renewable sources. One of the most attractive methods is the conversion of sunlight into chemical fuels, called solar energy conversion. This dissertation advances the fundamental photophysical properties of the molecules and materials involved in two applications of solar energy conversion: dye-sensitized photoelectrochemical cells (DSPECs) and silicon-based hybrid photoelectrodes.Chapter 1 describes the photophysical properties of ruthenium polypyridyl complexes-common chromophores in DSPECs-and the semiconductor photophysics which underpin silicon hybrid photoelectrodes.In Chapter 2, excited-state quenching studies in acetonitrile and acetone is used to study the effect of solvent polarity on the Coulombic attraction between iodide and a ruthenium complex decorated with aldehyde groups. Decreased solvent dielectric in acetone solution was shown to induce stronger association, increasing the equilibrium constant by an order of magnitude compared to acetonitrile, as measured by 1H NMR titration assays. The increased degree of association manifested in an increased contribution of static quenching.Chapter 3 leverages time-resolved infrared spectroscopy to understand the excited state behavior of chloride associated with ruthenium polypyridyl complexes decorated with amide groups in dichloromethane. In such complexes, the ground state equilibrium for chloride association was large ~107 M-1. Following laser excitation, the photoluminescence initially resembles the complex with chloride associated but evolves over time indicating photodissociation ("photo-release"). The time-resolved infrared spectra support an increase in the hydrogen bonding as a function of time. A model is proposed in which chloride migrates orthogonally to the plane of the bipyridine ligand in response to the excited-state dipole.Chapter 4 compares three fabrication methods for a silicon/silicon dioxide (Si/SiOx) passivation layer in silicon hybrid photoelectrodes: native oxide, chemically grown oxide, and thermal oxide, grown by rapid thermal annealing. Through time-resolved infrared spectroscopy, electrochemical impedance spectroscopy, and cyclic voltammetry, the rapid thermal annealing was identified as the optimal interface, possessing good electron transfer to a solution mediator, long lifetimes, and reduced surface trap state densities.Collectively, these findings deepen our understanding of molecular and interfacial photophysics, guiding the design of more efficient systems for solar-to-chemical energy conversion.
546 $a English
590 $a School code: 0153
650 4 $a Chemistry. $3 516420
650 4 $a Materials science. $3 543314
650 4 $a Alternative energy. $3 3436775
650 4 $a Molecular chemistry. $3 1071612
653 $a Renewable energy
653 $a Semiconductor physics
653 $a Semiconductor-electrolyte interface
653 $a Silicon photoelectrodes
653 $a Trap states
690 $a 0485
690 $a 0431
690 $a 0794
690 $a 0363
710 2 $a The University of North Carolina at Chapel Hill. $b Chemistry. $e degree granting institution. $3 3820817
720 1 $a Meyer, Gerald J. $e degree supervisor.
720 1 $a Miller, Alexander J. M. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-11B.
790 $a 0153
791 $a Ph.D.
792 $a 2025
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31939367