Potentiometry of an operating organic semiconductor field-effect transistor

Kannan Seshadri, C. Daniel Frisbie

Research output: Contribution to journalArticlepeer-review

112 Scopus citations


The potential profile across the channel of an operating sexithiophene-based field-effect transistor (FET) was investigated using an atomic force microscope with a conducting probe. A high impedance electrometer recorded the probe potential when it was placed in contact at fixed points with the channel surface. Tapping mode images taken with the same probe before and after individual point contact measurements verified that no damage was done to the device and allowed correlation of the potential profile with the device architecture. For any given source-drain bias, most of the potential drop occurred at the source and drain contacts, meaning the FET was contact limited. Moreover, the potential drop was not fixed but depended on the applied drain and gate voltages. This study demonstrates the utility of potential profiling for identifying high resistance bottlenecks to charge transport in organic-based devices.

Original languageEnglish (US)
Pages (from-to)993-995
Number of pages3
JournalApplied Physics Letters
Issue number7
StatePublished - Feb 12 2001

Bibliographical note

Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.


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