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Dynamics of photoinduced charge transfer between pentacene and a -terminated self-assembled monolayer
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FIG. 1.

(a) Schematic cross section of a pentacene transistor with Au source and drain electrodes and a gate insulator functionalized with a -terminated SAM. (b) Drain current as a function of time with illumination by 650 nm light at an intensity of between 40 and 340 s. [(c) and (d)] Logarithmic plots of the drain current and the fit of a sum of two exponential decays at the beginning and end of illumination.

Image of FIG. 2.

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FIG. 2.

(a) Drain current as a function of gate voltage for illuminated pentacene transistors at several times during the deposition of pentacene, measured with . (b) The threshold voltage shift resulting from illumination for two samples, measured during the pentacene deposition using a series of gate voltage scans from positive to negative gate voltages, beginning at 60 V.

Image of FIG. 3.

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FIG. 3.

(a) The flux of carriers out of the states, assuming constant lifetime of 1.9 s. A fit of the model for the flux of excitons to the interface is shown as the solid line using a surface recombination velocity of at the pentacene/ interface.

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/content/aip/journal/apl/94/7/10.1063/1.3080667
2009-02-17
2014-04-23

Abstract

A -terminated self-assembled monolayer can be used to place molecular acceptor states at the interface between the semiconductor and gate insulator of an organic field effect transistor. The time dependence of the photoinduced charge transfer between pentacene and has a fast component with a characteristic time of 1.9 s and slower component with a time constant of 32 and 48 s at the beginning and end of a transient increase in illumination, respectively. Variation in the threshold voltage shift with the thickness of the pentacene results from the competing length scales for light absorption and excitondiffusion.

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Scitation: Dynamics of photoinduced charge transfer between pentacene and a C60-terminated self-assembled monolayer
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/7/10.1063/1.3080667
10.1063/1.3080667
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