
Proceedings Paper
Optical method for making spatially and temporally resolved measurements of the hole concentration in organic electrochemical transistorsFormat | Member Price | Non-Member Price |
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Paper Abstract
Electrochemical reduction and oxidation of PEDOT:PSS are used to modulate the channel current in organic
electrochemical transistors (OECTs). In addition to changing PEDOT conductivity over more than 4 orders of
magnitude, these redox reactions cause a shift in the PEDOT:PSS absorption spectrum. In this work we have used this
shift in the absorption spectrum to make spatially and temporally resolved measurements of the redox state of
PEDOT:PSS. By applying these measurements to the PEDOT:PSS in an OECT channel, we have shown that the redox
state of the PEDOT:PSS is not constant along the channel during transistor operation. Furthermore, we have shown that
the time constant of the optical transition is significantly larger near the transistor source than it is near the transistor
drain. These results are not considered in existing models of the OECT transient response, and they may lead to a better
understanding of geometry-performance relationships in OECTs.
Paper Details
Date Published: 7 October 2014
PDF: 8 pages
Proc. SPIE 9185, Organic Field-Effect Transistors XIII; and Organic Semiconductors in Sensors and Bioelectronics VII, 91851X (7 October 2014); doi: 10.1117/12.2063564
Published in SPIE Proceedings Vol. 9185:
Organic Field-Effect Transistors XIII; and Organic Semiconductors in Sensors and Bioelectronics VII
Zhenan Bao; Ruth Shinar; Ioannis Kymissis; Iain McCulloch, Editor(s)
PDF: 8 pages
Proc. SPIE 9185, Organic Field-Effect Transistors XIII; and Organic Semiconductors in Sensors and Bioelectronics VII, 91851X (7 October 2014); doi: 10.1117/12.2063564
Show Author Affiliations
Jacob T. Friedlein, Univ. of Colorado at Boulder (United States)
Sean E. Shaheen, Univ. of Colorado at Boulder (United States)
National Renewable Energy Lab. (United States)
Sean E. Shaheen, Univ. of Colorado at Boulder (United States)
National Renewable Energy Lab. (United States)
Robert R. McLeod, Univ. of Colorado at Boulder (United States)
Published in SPIE Proceedings Vol. 9185:
Organic Field-Effect Transistors XIII; and Organic Semiconductors in Sensors and Bioelectronics VII
Zhenan Bao; Ruth Shinar; Ioannis Kymissis; Iain McCulloch, Editor(s)
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