[18p-PA5-1~28] 12.4 Organic light-emitting devices and organic transistors

[18p-PA5-9] Current instability of organic transistors owing to water molecules at electrode contacts

〇(M1)Yoshiaki Ishihara¹, Nouchi Ryo^1,2 (1.Osaka Prefecture Univ, 2.JST PRESTO)

Keywords:electrode contact, water molecule, hysteresis

In organic field effect transistors, a hysteretic behavior in the drain current is generally observed in which the current level of the backward sweep of the voltages is lower than the forward sweep in transistor characteristics. This behavior is due to the penetration of water molecules into the interface between the gate insulator and the semiconductor. On the other hand, we have found and confirmed a mechanism attributable to the penetration of water into the electrode contact, where the current level is higher in the backward sweep. It was also found that the degree of hysteresis varies depending on the fabrication method of the semiconductor layer.