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(a) Device layout and schematics of the three different SAM compositions. (b) UV/Vis spectra of 35 nm pentacene (red) and 30 nm DH6T (blue) evaporated on quartz glass and wavelengths of the laser diodes indicated by vertical lines in the diagram.
Transfer characteristics for pentacene (a)–(c) and DH6T (d)–(f) in the dark (solid lines) and under illumination with λ = 658 nm and 10 mW/cm2 (dashed lines) in the saturation regime at VDS = −2 V. Inset in (d) shows a transfer characteristic under illumination with λ = 406 nm.
Output characteristics for pentacene on SAM 3 (a) and DH6T on SAM 2 (b) at VGS = 0 V and under different illumination intensities with the 658 nm laser.
Ratio of photocurrent and dark current as a function of time and switching behavior for pentacene on SAM 3 (black) and SAM 1 (green) and DH6T on SAM 2 (red). The resolution of the measurement was 8 ms, the 658 nm laser with an intensity of 30 mW/cm2 was turned on after approximately 13 s.
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