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Thermal Conductivities of Organic Semiconductors.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Thermal Conductivities of Organic Semiconductors./
Author:	Yao, Yulong.
Description:	1 online resource (81 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
Contained By:	Dissertation Abstracts International79-04B(E).
Subject:	Condensed matter physics. -
Online resource:	click for full text (PQDT)
ISBN:	9780355373707

Thermal Conductivities of Organic Semiconductors.
Yao, Yulong.

Thermal Conductivities of Organic Semiconductors. - 1 online resource (81 pages)

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

Thesis (Ph.D.)

Includes bibliographical references

Organic semiconductors have gained a lot of interest due to their ease of processing, low-cost and inherent mechanical flexibility. Although most of the research has been on their electronic and optical properties, knowledge of the thermal properties is important in the design of electronic devices as well. Our group has used ac-calorimetric techniques to measure both in-plane and transverse thermal conductivities of a variety of organic semiconductors including small-molecule crystals and polymer blends. For layered crystals composed of molecules with planar backbones and silylethynyl (or germylethynyl) sidegroups projecting between the layers, very high interplanar thermal conductivities have been observed, presumably implying that heat flows between layers mostly via interactions between librations on these sidegoups.

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

Mode of access: World Wide Web

ISBN: 9780355373707Subjects--Topical Terms:

1148471
Condensed matter physics.
Index Terms--Genre/Form:

554714
Electronic books.

Thermal Conductivities of Organic Semiconductors.
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100 1 $a Yao, Yulong. $3 1182542
245 1 0 $a Thermal Conductivities of Organic Semiconductors.
264 0 $c 2017
300 $a 1 online resource (81 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
500 $a Adviser: Joseph W. Brill.
502 $a Thesis (Ph.D.) $c University of Kentucky $d 2017.
504 $a Includes bibliographical references
520 $a Organic semiconductors have gained a lot of interest due to their ease of processing, low-cost and inherent mechanical flexibility. Although most of the research has been on their electronic and optical properties, knowledge of the thermal properties is important in the design of electronic devices as well. Our group has used ac-calorimetric techniques to measure both in-plane and transverse thermal conductivities of a variety of organic semiconductors including small-molecule crystals and polymer blends. For layered crystals composed of molecules with planar backbones and silylethynyl (or germylethynyl) sidegroups projecting between the layers, very high interplanar thermal conductivities have been observed, presumably implying that heat flows between layers mostly via interactions between librations on these sidegoups.
520 $a Since most organic semiconducting devices require materials in thin film rather than bulk crystal form, I have focused on using the "3o-technique" to measure the thermal resistances of thin films of this class of organic semiconductors, including bis(triisopropylsilylethynyl) pentacene (TIPS-pn), bis(triethylsilylethynyl) anthradithiophene (TES-ADT), and difluoro bis(triethylsilylethynyl) anthradithiophene (diF-TES-ADT). For each material, several films of different thicknesses have been measured to separate the effects of intrinsic thermal conductivity from interface thermal resistance. For sublimed films of TIPS-pn and diF-TES-ADT, with thicknesses ranging from less than 100 nm to greater than 4 mum, the thermal conductivities are similar to those of polymers and over an order of magnitude smaller than those of single crystals, presumably reflecting the large reduction in phonon mean-free path due to disorder in the films. On the other hand, the thermal resistances of thin (≤ 205 nm) crystalline films of TES-ADT, prepared by vapor-annealing of spin-cast films, are dominated by their interface resistances, possibly due to dewetting of the film from the substrate during the annealing process.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Condensed matter physics. $3 1148471
650 4 $a Materials science. $3 557839
650 4 $a Organic chemistry. $3 1148722
655 7 $a Electronic books. $2 local $3 554714
690 $a 0611
690 $a 0794
690 $a 0490
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of Kentucky. $b Physics and Astronomy. $3 1182543
773 0 $t Dissertation Abstracts International $g 79-04B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10672510 $z click for full text (PQDT)