Journal article
Identification of both bipolaron and electron-hole pair contributions to organic magnetoresistance in a regioregular polythiophene device
Organic electronics, Vol.48, pp.198-203
09/2017
DOI: 10.1016/j.orgel.2017.05.051
Abstract
We study organic diodes of regioregular polythiophene (RR-P3HT) fabricated with various anode and cathode materials to determine the importance of bipolarons and electron-hole pairs for magnetoconductance (MC). RR-P3HT is selected because it can display both negative or positive MC depending on the electrodes used to fabricate the devices. Near-unipolar, electron-only, devices show negative MC at all voltages. We attribute this to the bipolaron mechanism. Both a negative (low voltage) and positive (high voltage) MC are measured in bipolar devices. The positive and negative MC are attributed to the electron-hole pair mechanism and the bipolaron mechanism, respectively. This conclusion is supported by an analysis of the electroluminescence efficiency versus voltage and the magnetic field effect on the electroluminescence quantum efficiency.
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•Magnetoconductance measured in uni- and bipolar P3HT devices tests proposed models.•Electron-only devices display only negative magnetoconductance.•This is attributed to the bipolaron mechanism.•Negative and positive magnetoconductance measured in bipolar devices.•The positive magnetoconductance is attributed to the electron-hole pair model.
Details
- Title: Subtitle
- Identification of both bipolaron and electron-hole pair contributions to organic magnetoresistance in a regioregular polythiophene device
- Creators
- Kevser Sahin-Tiras - University of IowaAustin D Riedl - University of Wisconsin–Eau ClaireMarkus Wohlgenannt - University of IowaJames Rybicki - University of Wisconsin–Eau Claire
- Resource Type
- Journal article
- Publication Details
- Organic electronics, Vol.48, pp.198-203
- Publisher
- Elsevier B.V
- DOI
- 10.1016/j.orgel.2017.05.051
- ISSN
- 1566-1199
- eISSN
- 1878-5530
- Grant note
- DOI: 10.13039/100008893, name: University of Iowa; name: IFI; DOI: 10.13039/100010315, name: University of Wisconsin Eau Claire
- Language
- English
- Date published
- 09/2017
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199720202771
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