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Molecular control of pentacene/ZnO photoinduced charge transfer
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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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