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Microstructural Effects on Charge Tr...

Callahan, Rebecca A.

Microstructural Effects on Charge Transfer in Small Molecule Heterojunctions: A Tale of Tails.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Microstructural Effects on Charge Transfer in Small Molecule Heterojunctions: A Tale of Tails.
Author:	Callahan, Rebecca A.
Description:	173 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.
Notes:	Advisers: David Walba; Garry Rumbles.
Contained By:	Dissertation Abstracts International75-09B(E).
Subject:	Molecular chemistry.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3621306
ISBN:	9781303923401

Microstructural Effects on Charge Transfer in Small Molecule Heterojunctions: A Tale of Tails.
Callahan, Rebecca A.

Microstructural Effects on Charge Transfer in Small Molecule Heterojunctions: A Tale of Tails. - 173 p.

Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.

Thesis (Ph.D.)--University of Colorado at Boulder, 2014.

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

In a simplified picture of an organic photovoltaics active layer the molecular orbital energies are used to predict photo-induced charge transfer between potential electron donors and acceptors, a crucial step in the generation of electrical power from light. Yet often systems that are projected to work by this metric, in fact, do not work; perhaps there is more to it. The work presented in this thesis adds to the understanding of how solid-state microstructure ultimately affects photoinduced charge transfer. Two distinctive small molecule electron donors are presented and determined to undergo microstructure-modulated charge transfer for different reasons. Time-resolved microwave conductivity is used to detect photogenerated charges and powder x-ray diffraction, transmission electron microscopy, and solid-state photophysics are used to elucidate the film microstructure. In the first system presented, a helical nanofilament heterojunction is shown to yield more charge transfer than a lamellar structuring of the same materials; a competing pathway for charge generation is proposed. In the second system, a series of PBTTT-inspired small molecules with varied alkoxy tail lengths demonstrates systematic differences in the microstructure, photophysics, and charge transfer driving forces and therefore yield. In both cases solid-state microstructure is conclusively has considerable effect on the photophysical properties and charge transfer in organic donor-acceptor blends.

ISBN: 9781303923401Subjects--Topical Terms:

468169
Molecular chemistry.

Microstructural Effects on Charge Transfer in Small Molecule Heterojunctions: A Tale of Tails.
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245 1 0 $a Microstructural Effects on Charge Transfer in Small Molecule Heterojunctions: A Tale of Tails.
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500 $a Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.
500 $a Advisers: David Walba; Garry Rumbles.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2014.
506 $a This item must not be sold to any third party vendors.
520 $a In a simplified picture of an organic photovoltaics active layer the molecular orbital energies are used to predict photo-induced charge transfer between potential electron donors and acceptors, a crucial step in the generation of electrical power from light. Yet often systems that are projected to work by this metric, in fact, do not work; perhaps there is more to it. The work presented in this thesis adds to the understanding of how solid-state microstructure ultimately affects photoinduced charge transfer. Two distinctive small molecule electron donors are presented and determined to undergo microstructure-modulated charge transfer for different reasons. Time-resolved microwave conductivity is used to detect photogenerated charges and powder x-ray diffraction, transmission electron microscopy, and solid-state photophysics are used to elucidate the film microstructure. In the first system presented, a helical nanofilament heterojunction is shown to yield more charge transfer than a lamellar structuring of the same materials; a competing pathway for charge generation is proposed. In the second system, a series of PBTTT-inspired small molecules with varied alkoxy tail lengths demonstrates systematic differences in the microstructure, photophysics, and charge transfer driving forces and therefore yield. In both cases solid-state microstructure is conclusively has considerable effect on the photophysical properties and charge transfer in organic donor-acceptor blends.
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