Effect of Density of States on Mobility in Small-Molecule n-Type Organic Thin-Film Transistors Based on a Perylene Diimide


Bottom-contact organic thin-film transistors with active layers created of n-type tiny-molecule perylene diimide Polyera ActivinkTM N1400 were fabricated and were compared with those of 6,thirteen-bis (triisopropylsilylethinyl)pentacene and poly(triarylamine) (PTAA). For the 3 devices, the mobility values and also the distribution of the density of states (DOS) were estimated from current–voltage measurements. The mobility value of the N140zero samples will increase up to four orders of magnitude among the measured voltage vary, reaching the PTAA mobility values at high gate voltages. Finally, we have a tendency to analyze the result of the distribution of the DOS on the mobility by studying the free-charge sheet concentration.

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