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Organic semiconductor materials for OFETs

From the Hall data, the density of mobile carriers in the OFET s channel can be directly determined for the first time, without the assumptions regarding the gate-channel capacitance Q. Hall effect studies in other organic semiconductors (e.g., pentacene and tetracene) are highly desirable because most of the OFETs based on those materials still operate in the trap-dominated regime and the intrinsic mobilities at the surface of these semiconductors, To(7), are unknown. The Hall measurements, however, are complicated by a very high sheet resistance of the conduction channel typical for OFETs, which often exceeds 10 MO/square. For this reason, the first demonstration of the Hall effect appeared only recently, due to the high carrier mobility in rubrene [82,83]. [Pg.53]

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