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Enabling n-channel oligomer and poly...

Letizia, Joseph Adam.

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Enabling n-channel oligomer and polymer semiconductors through rational design, synthesis, computational modeling, and temperature dependent field effect transistor study.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Enabling n-channel oligomer and polymer semiconductors through rational design, synthesis, computational modeling, and temperature dependent field effect transistor study./
Author:	Letizia, Joseph Adam.
Description:	212 p.
Notes:	Advisers: Mark A. Ratner; Tobin J. Marks.
Contained By:	Dissertation Abstracts International68-11B.
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3284130
ISBN:	9780549294054

Enabling n-channel oligomer and polymer semiconductors through rational design, synthesis, computational modeling, and temperature dependent field effect transistor study.
Letizia, Joseph Adam.

Enabling n-channel oligomer and polymer semiconductors through rational design, synthesis, computational modeling, and temperature dependent field effect transistor study. - 212 p.

Advisers: Mark A. Ratner; Tobin J. Marks.

Thesis (Ph.D.)--Northwestern University, 2007.

Conjugated organic molecules and polymers hold significant promise for use as active materials in electronic devices. Employing such "soft" materials can decrease cost of device fabrication, while enabling unique properties such as mechanical flexibility, large-area coverage, and highly tunable materials properties. A primary roadblock to the realization of this dream has been stability of mobile electrons in organic thin-films. In fact, very few semiconductors exhibit electron transport (n-channel) activity under ambient conditions in field effect transistors (FETs), a standard test-bed device for semiconductor thin-films. Even fewer organic semiconductors have desirable processing characteristics. This work addresses these challenges via computationally-aided rational design of novel electron transporting (n-channel) materials yielding new n-channel air-stable semiconductors, record-setting figures-of-merit for solution processed films, and two examples of rare n-channel FET polymeric semiconductors. Further characterization of charge trapping in organic semiconductors is studied by variable temperature transistor measurements and a direct correlation between charge trapping and mobility is observed.

ISBN: 9780549294054Subjects--Topical Terms:

560527
Chemistry, Physical.

Enabling n-channel oligomer and polymer semiconductors through rational design, synthesis, computational modeling, and temperature dependent field effect transistor study.
LDR:03852nam 2200337 a 45 001 957396
005 20110630
008 110630s2007 ||||||||||||||||| ||eng d
020 $a 9780549294054
035 $a (UMI)AAI3284130
035 $a AAI3284130
040 $a UMI $c UMI
100 1 $a Letizia, Joseph Adam. $3 1280748
245 1 0 $a Enabling n-channel oligomer and polymer semiconductors through rational design, synthesis, computational modeling, and temperature dependent field effect transistor study.
300 $a 212 p.
500 $a Advisers: Mark A. Ratner; Tobin J. Marks.
500 $a Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7370.
502 $a Thesis (Ph.D.)--Northwestern University, 2007.
520 $a Conjugated organic molecules and polymers hold significant promise for use as active materials in electronic devices. Employing such "soft" materials can decrease cost of device fabrication, while enabling unique properties such as mechanical flexibility, large-area coverage, and highly tunable materials properties. A primary roadblock to the realization of this dream has been stability of mobile electrons in organic thin-films. In fact, very few semiconductors exhibit electron transport (n-channel) activity under ambient conditions in field effect transistors (FETs), a standard test-bed device for semiconductor thin-films. Even fewer organic semiconductors have desirable processing characteristics. This work addresses these challenges via computationally-aided rational design of novel electron transporting (n-channel) materials yielding new n-channel air-stable semiconductors, record-setting figures-of-merit for solution processed films, and two examples of rare n-channel FET polymeric semiconductors. Further characterization of charge trapping in organic semiconductors is studied by variable temperature transistor measurements and a direct correlation between charge trapping and mobility is observed.
520 $a A powerful and general approach to materials design is presented in the first two chapters of this work. DFT-level electronic structure calculations are employed to screen synthetically relevant candidate materials for desirable semiconductor properties. This rational molecular engineering method yields a family of phenacyl-thiophene and quinone-based semiconductors exhibiting mobilities up to &sim; 0.3 cm2V-1s-1 for solution processed films and temporally air-stable mobilities of 0.015 cm2V-1s-1 with high current modulation > 106. Additionally, two of the first n-channel polymers are developed, exhibiting mobilities up to 0.012 cm2V -1s-1 and remarkable polymer thin-film crystallinity.
520 $a The charge transport mechanism for a series of semiconductors is probed by variable temperature FET experiments, the first such study employing semiconductors with diverse molecular and device properties. Analysis of temperature activated FET behavior reveals an inverse correlation between increased charge trap filling and ambient-temperature mobility. Furthermore, there is no evidence for a relationship between conduction orbital energy and the mobility-limiting shallow trap states. This combination of rational design employing appropriate quantum chemical methods and synthetic practicality coupled with an enhanced understanding of trap-limited charge carrier mobility evidences the vibrant progress and continued promise of organic electronic materials.
590 $a School code: 0163.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0494
690 $a 0495
710 2 $a Northwestern University. $b Chemistry. $3 1030729
773 0 $t Dissertation Abstracts International $g 68-11B.
790 $a 0163
790 1 0 $a Freeman, Arthur $e committee member
790 1 0 $a Marks, Tobin J., $e advisor
790 1 0 $a Ratner, Mark A., $e advisor
790 1 0 $a Wasielewski, Michael $e committee member
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3284130