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Magnetic-field dependent differential capacitance of polymer diodes
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Figures

Image of FIG. 1.

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FIG. 1.

Conductance of device F (thickness 160 nm) versus frequency. (a) Low and intermediate bias regimes. (b) High bias regime. The data for indicated bias voltages are shifted for clarity. Dashed lines indicate level of zero capacitance.

Image of FIG. 2.

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FIG. 2.

Capacitance of device C (thickness 150 nm) at bias voltage 7.1 V versus frequency at indicated magnetic fields. The solid black lines are fits of the data at  = 0 and 180 mT with Eq. (1) .

Image of FIG. 3.

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FIG. 3.

(a) Capacitance at 3 Hz as a function of bias voltage for device G (MEH-PPV thickness is 50 nm). The inset shows the same data on the magnified scale. (b) Capacitance versus frequency at indicated biases for device H with 50 nm-thick DOO-PPV active layer. The solid line is a fit of the data at  = 4.16 V with Eq. (1) .

Image of FIG. 4.

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FIG. 4.

(a) Current density versus frequency for several studied OLEDs. (b) The parameter as function of bias for the same OLEDs. Vertical arrows indicate biases at which the capacitance reverses from negative to positive.

Tables

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Table I.

Parameters of the devices.

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/content/aip/journal/apl/101/9/10.1063/1.4748797
2012-08-28
2014-04-18

Abstract

Using admittance spectroscopy, we found that bipolar organic diodes based on pi-conjugated polymer, 2-methoxy-5-(2′-ethylhexyloxy), MEH-PPV, have strong divergent contribution to the device differential capacitance. It is positive at low bias voltages, turns negative at intermediate biases, and becomes positive again at stronger biases. In addition, we found that at certain biases, a small magnetic field can change the capacitance from divergent negative to divergent positive. Possible physical processes responsible for this anomalous behavior of the capacitance and its relation to the phenomenon of organic magnetoresistance are discussed.

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Scitation: Magnetic-field dependent differential capacitance of polymer diodes
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/9/10.1063/1.4748797
10.1063/1.4748797
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