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Device geometry of the organic field-effect transistors with one modified gold contact. On the right side a true-color image of the channel area taken with a microscope and CCD camera is shown, clearly exhibiting a color change for the altered contact. It should be noted that PTAA is transparent in the visible range, and PEDOT∕PSS is almost transparent. The color changes therefore are due to interference effects of the thin films.
Transfer characteristic (gate sweep) of a pentacene transistor with one PEDOT∕PSS covered electrode. The solid line shows the sweep when injecting holes from the PEDOT∕PSS electrode (source) and removing them through the gold electrode (drain), whereas the dashed line shows the inverted operations mode.
(top) Transfer characteristic (gate sweep) of a PTAA transistor with one PEDOT∕PSS covered electrode. Again, the solid curve uses the PEDOT∕PSS modified gold electrode as source, and the dashed curve the unaltered gold electrode as source. (bottom) Below, a gold∕PEDOT-PSS (spun)∕PTAA∕gold sandwich device, a hole-only device, is shown. The currents are half an order of magnitude higher when the injection occurs from the spincast PEDOT∕PSS layer. This is to confirm that the PEDOT∕PSS really does have better injection characteristics into PTAA.
Output characteristic for the same PTAA transistor as shown in Fig. 3. The top graph shows the output with gold as the source electrode and PEDOT∕PSS as drain, and the bottom graph shows PEDOT∕PSS as the source electrode and gold as drain.
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