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Increasing organic vertical carrier mobility for the application of high speed bilayered organic photodetector
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FIG. 1.

(a) Schematic device structure of the bilayered PD. (b) The energy band diagrams of sample A and sample B. (c) The incident photon-to-electron conversion efficiency of sample A and sample B under various reverse voltage biases. The inset shows the absorption spectra of pentacene and P3HT.

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FIG. 2.

(a) The current density–voltage characteristics of organic diodes with C60, P3HT, pentacene deposited at 0.1 Å/s, and pentacene deposited at 1 Å/s. (b) The electrical frequency responses of pentacene diodes and P3HT diode. Characteristics of diodes made by pentacene films deposited at different deposition rate are compared.

Image of FIG. 3.

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FIG. 3.

The frequency characteristics of PDs made by pentacene and P3HT. Characteristics of PDs made by pentacene films deposited at different deposition rate are compared. The gray dotted line is calculated following . The schematic measurement setup is shown in the inset.

Image of FIG. 4.

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FIG. 4.

AFM images of 100, 1.5, and 3 nm pentacene films deposited at (a) 0.1 Å/s and (b) 1 Å/s, (c) 0.1 Å/s and (d) 1 Å/s, and (e) 0.1 Å/s and (f) 1 Å/s on PEDOT:PSS covered ITO glass, respectively.

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/content/aip/journal/apl/95/21/10.1063/1.3263144
2009-11-25
2014-04-20

Abstract

The direct influence of the vertical carrier mobility on the frequency response of bilayered organic photodiodes (PDs) is investigated for the first time. With fullerene as the acceptor material, changing vertical hole mobility from to increases PD bandwidth from 10 to 80 MHz under a 4 V operation. The influence of deposition rate on vertical hole mobility of pentacene film is also discussed. Our results facilitate the application of bilayered organic PDs on the detection of very-high-frequency optical signals.

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Scitation: Increasing organic vertical carrier mobility for the application of high speed bilayered organic photodetector
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/21/10.1063/1.3263144
10.1063/1.3263144
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