The effect of 3-mercapto-5-nitro-benzimidazole (MNB) and poly (methylmethacrylate) (PMMA) treatment sequence organic thin film transistor

摘要

A bottom contact organic thin film transistorrn(OTFT) is fabricated with an organic double-layeredrngate insulator (GI) and pentacene. The PMMA andrnMNB layers are treated on gate insulator andrnsource/drain (S/D, Au) before depositing pentacenernto investigate device properties and pentacenerngrowth. The sequence of surface treatment affects arndevice performance seriously. The ultra-thin PMMArn(below 50A) was deposited on organic gate insulatorrnand S/D metal by spin coating method, whichrnshowed no deterioration of on-state current (Ion)rnalthough bottom contact structure was exploited. Wernproposed that the reason of no contact resistancern(Rc) increase may be due to a wettability differencernin between PMMA / Au and PMMA / organic GI. Asrna result, the device treated by PMMA MNBrnshowed much better Ion behavior than thosernfabricated by MNB PMMA. We will report thernimportant physical and electrical performancerndifference associated with surface treatmentrnsequence.