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Molecular control of pentacene/ZnO photoinduced charge transfer
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FIG. 1.

(a) Schematic of a pentacene FET incorporating a layer of ZnO QDs at the pentacene/ interface. (b) Scanning electron micrograph of a submonolayer of ZnO QDs spin-coated onto the gate insulator. (c) Energy band alignments for pentacene and nanocrystalline ZnO and the relevant rate constants for charge transfer.

Image of FIG. 2.

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FIG. 2.

(a) Transfer characteristics of a pentacene FET incorporating ZnO QDs at the pentacene/gate insulator interface, acquired in the dark (solid line) and under illumination (dashed line). (b) Transfer characteristics of pentacene on an gate dielectric without ZnO in the dark (solid line) and under illumination (dashed line).

Image of FIG. 3.

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FIG. 3.

Transfer characteristics in the dark (solid line) and under illumination (dashed line) for (a) pentacene on ZnO QDs functionalized with stearic acid and (b) pentacene on ZnO QDs functionalized with 3TCOOH.

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2011-03-09
2014-04-23

Abstract

Photoinduced charge transfer modifies the device properties of illuminated pentacene field effect transistors(FETs) incorporating ZnOquantum dots at the gate insulator/pentacene interface. The transferred charge is trapped on electronic states associated with the ZnOquantum dots, with a steady state population approximately proportional to the rate of organic-inorganic charge transfer. Trapped charge shifts the threshold voltage of the FETs, providing the means to evaluate the rate of organic/inorganic charge transfer and the effects of interface modification. Monolayers of the wide-gap alkane stearic acid and the conjugated oligomer terthiophene attached to the ZnO suppress or permit charge transfer, respectively.

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Scitation: Molecular control of pentacene/ZnO photoinduced charge transfer
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/10/10.1063/1.3560481
10.1063/1.3560481
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