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Carrier transport mechanisms of organic bistable devices fabricated utilizing colloidal ZnO quantum dot-polymethylmethacrylate polymer nanocomposites
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Image of FIG. 1.

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FIG. 1.

I-V curves for an Al/ZnO QDs embedded in PMMA layer/ITO device. The scanning step of the applied voltage is 0.01V.

Image of FIG. 2.

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FIG. 2.

(a) The log-log plot of current as a function of the voltage for the Al/ZnO QDs embedded in PMMA layer/ITO devices, and the curves are fitted for SCLC mechanism. The inset represents the ln(I) vs characteristics at lower voltages, and the curve is fitted for TE conduction mechanism. (b) FN plot for the OBDs with ZnO QDs-PMMA nanocomposites.

Image of FIG. 3.

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FIG. 3.

Schematic diagram of the energy band diagram corresponding to the carrier transport mechanisms of the hole and electron injection processes during the positive voltage for the Al/ZnO QDs embedded in PMMA layer/ITO devices. The HOMO and the LUMO represent the energy levels of the highest occupied molecular orbital and the lowest unoccupied molecular orbital of the PMMA, respectively. The and represent the conduction band edge and the valence band edge of the ZnO nanoparticles, respectively.

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/content/aip/journal/apl/97/1/10.1063/1.3454774
2010-07-07
2014-04-23

Abstract

Organic bistable devices (OBDs) fabricated utilizing ZnOquantum dots(QDs) embedded in a poly(methyl methacrylate) (PMMA) layer were fabricated by using a spin-coating technique. Transmission electron microscopy images revealed that 5-nm-diameter ZnOQDs were formed inside the PMMA polymer layer. Current-voltage (I-V) measurements on Al/ZnO QDs embedded in PMMA layer/indium-tin-oxide devices at 300 K showed electrical bistability. The maximum ON/OFF ratio of the current bistability for the OBDs was as large as . Carrier transport mechanisms for the OBDs are described by using several models to fit the experimental I-V data.

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Scitation: Carrier transport mechanisms of organic bistable devices fabricated utilizing colloidal ZnO quantum dot-polymethylmethacrylate polymer nanocomposites
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/1/10.1063/1.3454774
10.1063/1.3454774
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