Polyvinyl Alcohol (PVA)/Layered Silicate Nanocomposite Approaches for Organic Passivation Layers in Organic Thin Film Transistors

摘要

We have synthesized novel organic passivation materials to protect organic thin film transistors (OTFTs) from H{sub}2O and O{sub}2 using PVA/layered silicate (SWN) nano composite system. Up to 3 wt% of layered silicate to PVA, very homogeneous nanocomposite solution was prepared. Pentacene OTFT device showed no significant initial performance drop after passivation with PVA/layered silicate nanocomposite and even mobility was slightly improved. But PVA only passivated OTFT device showed 25% of field effect mobility drop after passivation. PVA/layered silicate nanocomposite also formed smooth film layer by spin coating method with surface roughness below 2 nm. We propose layered silicate containing PVA nanocomposite film can be used as good organic passivation layer in OTFT.