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Bulk and Interface Charging Mechanisms in Organic Semiconductor-Gate Dielectric Bilayers

Published online by Cambridge University Press:  01 February 2011

Howard E. Katz ,
Cheng Huang  and
James West
Howard E. Katz
Affiliation:
[email protected], Johns Hopkins University, 3400 North Charles Street, Baltimore, MD, 21218, United States, 410-516-6141, 410-516-5293
Cheng Huang
Affiliation:
[email protected], Johns Hopkins University, United States
James West
Affiliation:
[email protected], Johns Hopkins University, United States
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Abstract

Since the first reports of charge storage in the gate dielectrics of organic semiconductors, several groups have proposed charge-storing dielectrics that become polarized through varied mechanisms, and have offered various explanations for observed charge storage phenomena. These groups were concerned either with nonvolatile memories as an application, or with controlling hysteresis in conventional OFETs. This manuscript describes measurements of surface charging and OFET threshold voltage shift for a case where charge is clearly stored in the dielectric. The magnitude and stability of the charge storage depend on the hydrophobicity of the dielectric and the charge deposition process. We focus on SiO2 as the dielectric and use a thiophene oligomer or hexadecafluoro-copper phthalocyanineas semiconductor. In one case, the phthalocyanine was inverted from electron- to hole-carrying, enabling a complementary device to be made from a single semiconductor.

Keywords

dielectricsemiconductingorganic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 889: Symposium W – Electroresponsive Polymers and Their Applications , 2005 , 0889-W08-02
Copyright
Copyright © Materials Research Society 2006

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