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Synthesis and processing strategies ...

Hiszpanski, Anna Maria.

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Synthesis and processing strategies to tune the film structure and optoelectronic properties of non-planar molecular semiconductors.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Synthesis and processing strategies to tune the film structure and optoelectronic properties of non-planar molecular semiconductors./
Author:	Hiszpanski, Anna Maria.
Description:	317 p.
Notes:	Source: Dissertation Abstracts International, Volume: 76-12(E), Section: B.
Contained By:	Dissertation Abstracts International76-12B(E).
Subject:	Chemical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3718465
ISBN:	9781321982985

Synthesis and processing strategies to tune the film structure and optoelectronic properties of non-planar molecular semiconductors.
Hiszpanski, Anna Maria.

Synthesis and processing strategies to tune the film structure and optoelectronic properties of non-planar molecular semiconductors. - 317 p.

Source: Dissertation Abstracts International, Volume: 76-12(E), Section: B.

Thesis (Ph.D.)--Princeton University, 2015.

Molecular semiconductors have generated significant interest for their potential use in lightweight and mechanically flexible electronic devices. Yet, predicting how new molecular semiconductors will perform in devices remains a challenge because devices are comprised of polycrystalline thin films of molecular semiconductors, and charge transport in these films depends greatly on the details of their microstructure whose heterogeneities can span multiple length scales. The microstructure typically evolves during deposition, and thus developing organic electronics not only hinges on the success of materials discovery, but also on the ability to fine-tune deposition and processing parameters to access the thin-film structure most conducive for charge transport.

ISBN: 9781321982985Subjects--Topical Terms:

560457
Chemical engineering.

Synthesis and processing strategies to tune the film structure and optoelectronic properties of non-planar molecular semiconductors.
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020 $a 9781321982985
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100 1 $a Hiszpanski, Anna Maria. $3 3182589
245 1 0 $a Synthesis and processing strategies to tune the film structure and optoelectronic properties of non-planar molecular semiconductors.
300 $a 317 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-12(E), Section: B.
500 $a Adviser: Yueh-Lin Loo.
502 $a Thesis (Ph.D.)--Princeton University, 2015.
520 $a Molecular semiconductors have generated significant interest for their potential use in lightweight and mechanically flexible electronic devices. Yet, predicting how new molecular semiconductors will perform in devices remains a challenge because devices are comprised of polycrystalline thin films of molecular semiconductors, and charge transport in these films depends greatly on the details of their microstructure whose heterogeneities can span multiple length scales. The microstructure typically evolves during deposition, and thus developing organic electronics not only hinges on the success of materials discovery, but also on the ability to fine-tune deposition and processing parameters to access the thin-film structure most conducive for charge transport.
520 $a This thesis explores chemical modification of a non-planar organic semiconductor, contorted hexabenzocoronene, cHBC, to tune its optoelectronic properties and processing strategies to induce structural changes in thin films. We primarily explore fluorine- and chlorine-substitution at the peripheral aromatic rings of cHBC to lower its energy levels and optical bandgap, and we demonstrate such halogenated derivatives as electron acceptors in organic solar cells. Substitution with these larger atoms also increases cHBC's intramolecular steric hindrance, providing access to an alternative molecular conformation with an order of magnitude higher solubility and systematic shifts in absorption and emission characteristics.
520 $a cHBC's non-planarity provides an added dimension of tunability as it frustrates crystallization during deposition, producing amorphous films that can be subsequently crystallized with post-deposition processing. Decoupling structural development from deposition allows us to fabricate transistors from differently treated cHBC films and elucidate the effects of changes in film structure on charge transport, as measured by the field-effect mobility. With different processing, the extent of cHBC oriented out-of-plane can be increased, which results in up to an order-of-magnitude increase in mobility. Also by solvent-vapor annealing with different solvents and applying solvent-vapor and thermal annealing in alternating sequences, three polymorphs of cHBC can be accessed whose mobilities differ by up to an order-of-magnitude. Films of fluorinated cHBC derivatives can also access two of these polymorphs depending on the solvent employed during solvent-vapor annealing. With a data-mining approach, we identify the solvent properties dictating polymorph selection to help guide processing for this family of compounds.
590 $a School code: 0181.
650 4 $a Chemical engineering. $3 560457
650 4 $a Materials science. $3 543314
650 4 $a Molecular chemistry. $3 1071612
690 $a 0542
690 $a 0794
690 $a 0431
710 2 $a Princeton University. $b Chemical and Biological Engineering. $3 2094012
773 0 $t Dissertation Abstracts International $g 76-12B(E).
790 $a 0181
791 $a Ph.D.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3718465