Correlation between contact angle and electrical properties in pentacene and C6-DNT-V-based organic thin film transistors

Abstract

We have fabricated pentacene and C6-DNT-V-based organic thin film transistors (OTFTs) with various types of interfacial layer. Eight different kinds of OTFTs were fabricated without and with interfacial layers (CT4112, PMMA, Cytop, OTS, HMDS, Ta2O5 and Si3N4). The surface properties of contact angle and electrical properties of OTFTs include charge carrier mobility, threshold voltage, and on/off current ratio were measured to compare and analyse the relationship between them. Some of the device properties show strong correlations, especially the relationship between contact angle and threshold voltage shows the strong correlation coefficient compare with others relationship. Correlation coefficient (R) between contact angle and threshold voltage was 0.83 for the pentacene and 0.88 for the C6-DNT-V-based OTFTs.