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Nanoscale organic and polymeric fiel...

Wang, Liang.

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Nanoscale organic and polymeric field -effect transistors and their applications as chemical sensors.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Nanoscale organic and polymeric field -effect transistors and their applications as chemical sensors./
Author:	Wang, Liang.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2005,
Description:	192 p.
Notes:	Source: Dissertations Abstracts International, Volume: 68-03, Section: B.
Contained By:	Dissertations Abstracts International68-03B.
Subject:	Electrical engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3216261
ISBN:	9780542667701

Nanoscale organic and polymeric field -effect transistors and their applications as chemical sensors.
Wang, Liang.

Nanoscale organic and polymeric field -effect transistors and their applications as chemical sensors. - Ann Arbor : ProQuest Dissertations & Theses, 2005 - 192 p.

Source: Dissertations Abstracts International, Volume: 68-03, Section: B.

Thesis (Ph.D.)--The University of Texas at Austin, 2005.

This work mainly focused on fabricating of nanoscale polycrystalline organic and conjugated polymeric thin-film field-effect transistors and investigating their scaling behaviors of electrical transport and chemical sensing properties. Devices with channel lengths systematically ranging from a few hundred microns down to sub 10 nm were successfully fabricated with the techniques such as stencil mask, photolithography, electron beam lithography, and break junction. The use of a novel four-terminal geometry ensures that the active area for charge transport and vapor sensing is truly nanoscale, and eliminates undesirable spreading currents traveling over the large area outside the defined channel to reduce the background signal level. It was discovered that upon scaling channel lengths from micron scale down to nanoscale, the dominating factors for charge transport and vapor sensing in organic thin-film transistors become different. At small dimensions, injection limited transport and field-dependent mobility are the dominant mechanisms for transport through the gate-modulated channel at low and high longitudinal fields respectively. Furthermore for sub 10 nm channels, tunneling effect plays an important role. In micron scale devices, the drain current usually decreases as a sensing response upon exposure of the polycrystalline organic/polymeric semiconductor layer to the analyte, mainly because of the transistor threshold shift caused by the immobile charges at grain boundaries trapped by the dipolar analyte molecules. The vapor sensing behavior of nanoscale organic transistors is markedly different (in an opposite direction of response) from that of large-scale devices for the same analyte-semiconductor combination, due to the fact that the electrical transport in a nanoscale OTFT depends on its morphological structure and interface properties (such as the injection barrier at the metal-organic semiconductor contacts) which could be modulated by the delivery of analyte.

ISBN: 9780542667701Subjects--Topical Terms:

649834
Electrical engineering.
Subjects--Index Terms:

Chemical sensors

Nanoscale organic and polymeric field -effect transistors and their applications as chemical sensors.
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245 1 0 $a Nanoscale organic and polymeric field -effect transistors and their applications as chemical sensors.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2005
300 $a 192 p.
500 $a Source: Dissertations Abstracts International, Volume: 68-03, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Dodabalapur, Ananth.
502 $a Thesis (Ph.D.)--The University of Texas at Austin, 2005.
520 $a This work mainly focused on fabricating of nanoscale polycrystalline organic and conjugated polymeric thin-film field-effect transistors and investigating their scaling behaviors of electrical transport and chemical sensing properties. Devices with channel lengths systematically ranging from a few hundred microns down to sub 10 nm were successfully fabricated with the techniques such as stencil mask, photolithography, electron beam lithography, and break junction. The use of a novel four-terminal geometry ensures that the active area for charge transport and vapor sensing is truly nanoscale, and eliminates undesirable spreading currents traveling over the large area outside the defined channel to reduce the background signal level. It was discovered that upon scaling channel lengths from micron scale down to nanoscale, the dominating factors for charge transport and vapor sensing in organic thin-film transistors become different. At small dimensions, injection limited transport and field-dependent mobility are the dominant mechanisms for transport through the gate-modulated channel at low and high longitudinal fields respectively. Furthermore for sub 10 nm channels, tunneling effect plays an important role. In micron scale devices, the drain current usually decreases as a sensing response upon exposure of the polycrystalline organic/polymeric semiconductor layer to the analyte, mainly because of the transistor threshold shift caused by the immobile charges at grain boundaries trapped by the dipolar analyte molecules. The vapor sensing behavior of nanoscale organic transistors is markedly different (in an opposite direction of response) from that of large-scale devices for the same analyte-semiconductor combination, due to the fact that the electrical transport in a nanoscale OTFT depends on its morphological structure and interface properties (such as the injection barrier at the metal-organic semiconductor contacts) which could be modulated by the delivery of analyte.
590 $a School code: 0227.
650 4 $a Electrical engineering. $3 649834
650 4 $a Polymers. $3 535398
650 4 $a Polymer chemistry. $3 3173488
653 $a Chemical sensors
653 $a Conjugated polymers
653 $a Field-effect transistors
653 $a Organic field-effect transistors
653 $a Polymeric
690 $a 0544
690 $a 0495
710 2 $a The University of Texas at Austin. $3 718984
773 0 $t Dissertations Abstracts International $g 68-03B.
790 $a 0227
791 $a Ph.D.
792 $a 2005
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3216261