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Localizing trapped charge carriers in NO2 sensors based on organic field-effect transistors
University of Groningen, Netherlands; Philips Research Labs, Netherlands.
Philips Research Labs, Netherlands; Technical University of Eindhoven, Netherlands.
University of Bayreuth, Germany; University of Freiburg, Germany.
University of Bayreuth, Germany.
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2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 101, no 15, 153302Article in journal (Refereed) Published
Abstract [en]

Field-effect transistors have emerged as NO2 sensors. The detection relies on trapping of accumulated electrons, leading to a shift of the threshold voltage. To determine the location of the trapped electrons we have delaminated different semiconductors from the transistors with adhesive tape and measured the surface potential of the revealed gate dielectric with scanning Kelvin probe microscopy. We unambiguously show that the trapped electrons are not located in the semiconductor but at the gate dielectric. The microscopic origin is discussed. Pinpointing the location paves the way to optimize the sensitivity of NO2 field-effect sensors.

Place, publisher, year, edition, pages
American Institute of Physics (AIP) , 2012. Vol. 101, no 15, 153302
National Category
Condensed Matter Physics
URN: urn:nbn:se:liu:diva-118138DOI: 10.1063/1.4758697ISI: 000310304900078OAI: diva2:813746

Funding Agencies|Zernike Institute for Advanced Materials; Netherlands Organization for Scientific Research (NWO) [700.57.425]; EU project ONE-P [212311]

Available from: 2015-05-25 Created: 2015-05-22 Last updated: 2015-06-04

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Kemerink, Martijn
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Chemical and Optical Sensor SystemsThe Institute of Technology
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