Abstract
A series of hydrophilic alkanethiols, HS(CH2)nOH with n=3, 4, 6, 8, 9 and 11, have been self-assembled on gold electrodes of pentacene-based thin-film transistors. The multi-parametric and ultra-sensitive response of these devices allows us to characterize both charge–injection and electrical stability moving from vacuum to air. The decay exponent β of charge injection is found to be 0.7–1.1Å−1 in agreement with earlier measurements of charge tunneling done by electrochemistry and large-area molecular junctions. We find that the intermediate chain lengths (n=4 and 6) yield an optimum response as they represent the best compromise in terms of decrease of the contact-resistance and bias stress.
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