Correspondence of the sign change in organic magnetoresistance with the onset of bipolar charge transport
In this work we examine the transition between positive and negative organic magnetoresistance in poly[2-methoxy-5-(3′3′<math display="inline" overflow="scroll" altimg="eq-00001.gif"><msup><mn>3</mn><mo>′</mo></msup></math>...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
29 December 2008
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| In: |
Applied physics letters
Year: 2008, Volume: 93, Issue: 26 |
| ISSN: | 1077-3118 |
| DOI: | 10.1063/1.3059555 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1063/1.3059555 Verlag, Volltext: https://aip.scitation.org/doi/10.1063/1.3059555 
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| Author Notes: | F.L. Bloom, W. Wagemans, M. Kemerink, and B. Koopmans |
| Summary: | In this work we examine the transition between positive and negative organic magnetoresistance in poly[2-methoxy-5-(3′3′<math display="inline" overflow="scroll" altimg="eq-00001.gif"><msup><mn>3</mn><mo>′</mo></msup></math>, 7′7′<math display="inline" overflow="scroll" altimg="eq-00002.gif"><msup><mn>7</mn><mo>′</mo></msup></math>-dimethyloctyloxy)-pp<math display="inline" overflow="scroll" altimg="eq-00003.gif"><mi>p</mi></math>-phenylenevinylene] in order to understand how different regimes of charge transport affect the organic magnetoresistance effect. To characterize the charge transport in these devices we measured the current, low frequency differential capacitance, and electroluminescence efficiency as a function of voltage. These measurements show that the sign change of the magnetoresistance corresponds with a change from a unipolar diffusive transport below the built in voltage (Vbi)(Vbi)<math display="inline" overflow="scroll" altimg="eq-00004.gif"><mrow><mrow><mo>(</mo><mrow><msub><mi>V</mi><mrow><mtext>bi</mtext></mrow></msub></mrow><mo>)</mo></mrow></mrow></math> to a regime of bipolar drift transport above VbiVbi<math display="inline" overflow="scroll" altimg="eq-00005.gif"><mrow><msub><mi>V</mi><mrow><mtext>bi</mtext></mrow></msub></mrow></math>. |
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| Item Description: | Gesehen am 12.12.2019 |
| Physical Description: | Online Resource |
| ISSN: | 1077-3118 |
| DOI: | 10.1063/1.3059555 |