Studies on correlation of surface and electrical properties in organic thin film transistors

摘要

We fabricated pentacene and thienoacene-based organic thin film transistor (OTFTs) with various types of interfacial layers between SiO_2 and organic semiconductor. Nine different kinds of OTFTs were fabricated without and with interfacial layers (CT4112, PMMA, Cytop, OTS, HMDS, Ta_2O_5, HfO_2, and Si_3N_4). The surface properties of contact angle and electrical properties of OTFTs include charge carrier mobility, threshold voltage, and on/off ratio were measured to compare and analyze the relationship between them. Based on present studies, some of device properties show a strong correlation, especially the relationship between contact angle and threshold voltage (pentacene-based OTFTs) shows the strong correlation coefficient (r = 0.83) compare with others relationship.