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Evaluation of the Vapor and Chemical Sensing Mechanism for Pentacene Field Effect Transistors

Published online by Cambridge University Press:  01 February 2011

Davianne A Duarte ,
Deepak Sharma ,
Brian Cobb  and
Ananth Dodabalapur
Davianne A Duarte
Affiliation:
[email protected]
Deepak Sharma
Affiliation:
[email protected], University of Texas at Austin, Electrical and computer engineering, Austin, Texas, United States
Brian Cobb
Affiliation:
[email protected], University of Texas at Austin, Electrical and computer engineering, Austin, Texas, United States
Ananth Dodabalapur
Affiliation:
[email protected], University of Texas at Austin, Electrical and computer engineering, Austin, Texas, United States
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Abstract

Properties such as semicondutor film grain size, morphology, and channel length are known to effect the sensing response in pentacene based organic thin film transistors (OTFTs). The sensing behavior for low and high mobility pentacene devices are reported here exhibiting different temperature dependent behaviors. The lower mobility OTFT exhibits an expected thermally activated response during alcohol testing with an increasing mobility with temperature along with a decreasing mobility at each temperature for increasing concentration. The higher mobility device exhibits a decrease in mobility with increasing temperature along with a decrease in mobility with increasing concentration at each temperature. In both sets of devices, the polar analyte produced reductions in drain current and shifts in threshold voltage.

Keywords

organicsensorsemiconducting
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1253: Symposium K – Functional Materials and Nanostructures for Chemical and Bochemical Sensing , 2010 , 1253-K02-05
Copyright
Copyright © Materials Research Society 2010

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