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Magnetic Field Effect on Photoconductivity of Single-Crystalline Pentacene and Perfluoropentacene Field-Effect Transistors

Published online by Cambridge University Press:  16 March 2012

Song-Toan Pham ,
Yoshitaka Kawasugi  and
Hirokazu Tada
Song-Toan Pham
Affiliation:
Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan.
Yoshitaka Kawasugi
Affiliation:
Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan.
Hirokazu Tada
Affiliation:
Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan.
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Abstract

Organic magnetoresistance (OMAR) of single-crystalline (SC) pentacene (C22H14) and perfluoropentacene (C22F14) was studied using field-effect transistor structures. The gate voltage effect showed that the OMAR originates from photo-induced current and requires both electrons and holes in the transport channel. The temperature dependence showed the maximum magnetoresistance (MR) ratio up to -6% under light irradiation at approximately 200 K and magnetic field of 80 mT. The charge carrier mobility and the exciton diffusion length were not important factors to determine the MR ratios. The interaction between triplet excitons and traps was thought to govern the OMAR behaviors.

Keywords

organiccrystallinephotoconductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1402: Symposium U – Charge Generation/Transport in Organic Semiconductor Materials , 2012 , mrsf11-1402-u05-03
Copyright
Copyright © Materials Research Society 2012

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References

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