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(Color online) atomic force microscopy image of the channel edge of a -thick pentacene film. Inset: the same image with shading (colors) representing dark gray (blue) the first pentacene layer, white (green) the second and third pentacene layers, and medium gray (red) more than three layers.
(Color online) (a) Averaged transfer curves for film thickness and a set of devices fabricated with a deposition rate. (b) Spectral noise density for -thick devices: (open red circles) devices fabricated with slow pentacene growth and (black squares) devices fabricated with fast pentacene growth . The line shows .
(Color online) Noise coefficient [Eq. (1)] as a function of inverse difference between the gate and the threshold voltages. The black squares indicate a typical device while the line indicates dependence .
(a) Average Hooge’s parameter [Eq. (4)] and (b) mobility as a function of the pentacene film thickness.
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