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Energy Transport in Organic Photovol...

Bergemann, Kevin J.

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Energy Transport in Organic Photovoltaics.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Energy Transport in Organic Photovoltaics./
Author:	Bergemann, Kevin J.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2015,
Description:	176 p.
Notes:	Source: Dissertation Abstracts International, Volume: 77-01(E), Section: B.
Contained By:	Dissertation Abstracts International77-01B(E).
Subject:	Condensed matter physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3721960
ISBN:	9781339038056

Energy Transport in Organic Photovoltaics.
Bergemann, Kevin J.

Energy Transport in Organic Photovoltaics. - Ann Arbor : ProQuest Dissertations & Theses, 2015 - 176 p.

Source: Dissertation Abstracts International, Volume: 77-01(E), Section: B.

Thesis (Ph.D.)--University of Michigan, 2015.

Organic photovoltaics (OPV) have the potential to be a flexible and low-cost form of carbon-neutral energy production. However, many of the underlying physical mechanisms that dictate the behavior of OPVs remain frustratingly obscure in comparison to the well-understood physics of inorganic semiconductors. This dissertation centers around the development of new techniques to characterize the behavior of excitons in organic semiconductors, both in the bulk and at interfaces. We first examine the method of spectrally-resolved photoluminescence quenching (SR-PLQ), the most convenient and powerful current technique for measuring the exciton diffusion length (LD) of organic semiconductors, and extend it to work with optically thin films. This allows for its application to a much wider range of materials and physical systems. The second part of the dissertation presents a further extension of the method of PL quenching to characterize non-ideal interfaces, those which block or quench only a fraction of incident excitons. This is used to understand the operation of a novel fullerene:wide energy gap material buffer in OPVs. In combination with charge transport and morphological studies, it is shown that the mixed buffer shows disproportionate benefits from the two materials; blocking excitons superlinearly with wide energy gap material concentration and still conducting charges efficiently even at very small (10%) fullerene concentration. Finally, we extend the principles of PL quenching to characterize arbitrary interfaces, including those between materials with identical energy levels but different LD and exciton lifetime, and those between materials with small (&sim;20 meV) energy offsets. These techniques allow us to finally resolve the ambiguity in the spin state of the exciton which serves as the primary source of photocurrent in C60, one of the most important materials in current efficient OPVs.

ISBN: 9781339038056Subjects--Topical Terms:

3173567
Condensed matter physics.

Energy Transport in Organic Photovoltaics.
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245 1 0 $a Energy Transport in Organic Photovoltaics.
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300 $a 176 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-01(E), Section: B.
500 $a Adviser: Stephen Forrest.
502 $a Thesis (Ph.D.)--University of Michigan, 2015.
520 $a Organic photovoltaics (OPV) have the potential to be a flexible and low-cost form of carbon-neutral energy production. However, many of the underlying physical mechanisms that dictate the behavior of OPVs remain frustratingly obscure in comparison to the well-understood physics of inorganic semiconductors. This dissertation centers around the development of new techniques to characterize the behavior of excitons in organic semiconductors, both in the bulk and at interfaces. We first examine the method of spectrally-resolved photoluminescence quenching (SR-PLQ), the most convenient and powerful current technique for measuring the exciton diffusion length (LD) of organic semiconductors, and extend it to work with optically thin films. This allows for its application to a much wider range of materials and physical systems. The second part of the dissertation presents a further extension of the method of PL quenching to characterize non-ideal interfaces, those which block or quench only a fraction of incident excitons. This is used to understand the operation of a novel fullerene:wide energy gap material buffer in OPVs. In combination with charge transport and morphological studies, it is shown that the mixed buffer shows disproportionate benefits from the two materials; blocking excitons superlinearly with wide energy gap material concentration and still conducting charges efficiently even at very small (10%) fullerene concentration. Finally, we extend the principles of PL quenching to characterize arbitrary interfaces, including those between materials with identical energy levels but different LD and exciton lifetime, and those between materials with small (&sim;20 meV) energy offsets. These techniques allow us to finally resolve the ambiguity in the spin state of the exciton which serves as the primary source of photocurrent in C60, one of the most important materials in current efficient OPVs.
590 $a School code: 0127.
650 4 $a Condensed matter physics. $3 3173567
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