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Microstructure and Carrier Transport Processes in Semiconducting Polymers.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Microstructure and Carrier Transport Processes in Semiconducting Polymers./
Author:	Dong, Ban Xuan.
Description:	1 online resource (169 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
Contained By:	Dissertation Abstracts International79-04B(E).
Subject:	Materials science. -
Online resource:	click for full text (PQDT)
ISBN:	9780355365191

Microstructure and Carrier Transport Processes in Semiconducting Polymers.
Dong, Ban Xuan.

Microstructure and Carrier Transport Processes in Semiconducting Polymers. - 1 online resource (169 pages)

Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.

Thesis (Ph.D.)--University of Michigan, 2017.

Includes bibliographical references

The molecular design and synthesis of semiconducting conjugated polymers was a major achievement in the field of chemistry, enabling the now viable organic electronics industry. Unlike their crystalline inorganic counterparts, the weak van der Waals bonding forces between conjugated polymer chains give rise to significant structural and energetic disorder. This reduces charge carrier mobility and adversely impacts device performances. Efforts to understand carrier transport in conjugated polymer systems have been challenged due to the complexity of the structure and a lack of proper understanding of the manner in which the polymer morphology affects electrical properties. This thesis focuses on developing several experimental strategies to turn polymer morphologies and studying the impact of polymer microstructure on carrier transport. The experimental approaches for morphology manipulation in this thesis include (i) fabricating film with different thickness (ii) using the environmentally benign method supercritical carbon dioxide processing and (iii) using a novel vacuum deposition technique to deposit thin polymer films.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355365191Subjects--Topical Terms:

557839
Materials science.
Index Terms--Genre/Form:

554714
Electronic books.

Microstructure and Carrier Transport Processes in Semiconducting Polymers.
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245 1 0 $a Microstructure and Carrier Transport Processes in Semiconducting Polymers.
264 0 $c 2017
300 $a 1 online resource (169 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
500 $a Adviser: Peter F. Green.
502 $a Thesis (Ph.D.)--University of Michigan, 2017.
504 $a Includes bibliographical references
520 $a The molecular design and synthesis of semiconducting conjugated polymers was a major achievement in the field of chemistry, enabling the now viable organic electronics industry. Unlike their crystalline inorganic counterparts, the weak van der Waals bonding forces between conjugated polymer chains give rise to significant structural and energetic disorder. This reduces charge carrier mobility and adversely impacts device performances. Efforts to understand carrier transport in conjugated polymer systems have been challenged due to the complexity of the structure and a lack of proper understanding of the manner in which the polymer morphology affects electrical properties. This thesis focuses on developing several experimental strategies to turn polymer morphologies and studying the impact of polymer microstructure on carrier transport. The experimental approaches for morphology manipulation in this thesis include (i) fabricating film with different thickness (ii) using the environmentally benign method supercritical carbon dioxide processing and (iii) using a novel vacuum deposition technique to deposit thin polymer films.
520 $a By studying thickness dependence of morphology and carrier transport in a low bandgap polymer, we show that the out-of-plane carrier mobilities in conjugated polymer films monotonically increase with thickness in the range of 100 nm to 1 ?m due to substrate-induced morphological changes as a function of film thickness. Our findings demonstrate that carrier mobility in conjugated polymers is not intrinsic properties of the materials but rather dictated by local morphology; it could vary nearly by an order of magnitude depend on the proximity to the substrate.
520 $a For the second route, we show how the polymer structure near polymer/substrate interface in organic thin film transistor can be selectively manipulated using supercritical carbon dioxide processing. Subsequently, we observe a significant enhancement in the in-plane carrier mobility that is accompanied by rather a subtle change in polymer morphology. This demonstrates that supercritical carbondioxide processing is an effective way to control polymer structure near the buried interface.
520 $a Lastly, we introduce a novel vacuum deposition technique Matrix-Assisted Pulse Laser Evaporation (MAPLE) to fabricate conjugated polymer films. Although the structure of MAPLE-deposited samples is highly disordered, transistor devices made from MAPLE-deposited films exhibit superior in-plane transport characteristics. Motivated by this finding, we then employ an advanced X-ray characterization method called complete pole figure construction and characterize the polymer structure at different stage of deposition in order to reveal the structure of MAPLE-deposited films at the buried interface. To our surprise we discover a large population of highly-oriented crystals at the buried interface having structure strongly depending on the substrate chemistry. We also show that this polymer layer dictates transport in thin film transistor, showing the importance of characterizing the structure at the buried interface in order to evaluate transistor performance.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Materials science. $3 557839
655 7 $a Electronic books. $2 local $3 554714
690 $a 0794
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of Michigan. $b Materials Science and Engineering. $3 1148587
773 0 $t Dissertation Abstracts International $g 79-04B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10670265 $z click for full text (PQDT)