Characterization of interface trap dynamics responsible for hysteresis in organic thin-film transistors

In this paper, the current hysteresis of organic thin film transistors (OTFTs) formed by TIPS-Pentacene has been demonstrated by bi-directional gate-voltage scan and explained using the trapping and detrapping mechanism. The trapping and detrapping rates have been further verified by the gate-voltage sampling method and the channel charge pumping method. The validity of the methods to characterize interface states of OTFTs that lead to the hysteresis is justified. The two independent methods consistently reveal that the hole trapping and release rates at the interface between the channel of the OTFTs to the gate dielectric are asymmetric.